Merge pull request 'ui: plan 01-27 done' (#1) from ai/ui-client into main

Reviewed-on: https://gitea.dev/developer/galaxy-game/pulls/1

.claude/settings.json

@@ -1,28 +1,23 @@
 {
-    "sandbox": {
-        "network": {
-            "allowLocalBinding": true,
-            "allowUnixSockets": ["/Users/id/.colima/default/docker.sock"],
-            "allowedDomains": [
-                "github.com",
-                "registry.npmjs.org",
-                "*.npmjs.org",
-                "docker.com",
-                "docker.io",
-                "gcr.io",
-                "*.golang.org"
-            ]
-        }
-    },
-    "enabledPlugins": {
-        "gopls-lsp@claude-plugins-official": true,
-        "context7@claude-plugins-official": true
-    },
-    "permissions": {
-        "defaultMode": "plan",
-        "allow": [
-            "mcp__context7__resolve-library-id",
-            "mcp__context7__get-library-docs"
-        ]
+  "permissions": {
+    "allow": [],
+    "defaultMode": "default"
+  },
+  "sandbox": {
+    "network": {
+      "allowedDomains": [
+        "github.com",
+        "registry.npmjs.org",
+        "*.npmjs.org",
+        "docker.com",
+        "docker.io",
+        "gcr.io",
+        "*.golang.org"
+      ],
+      "allowUnixSockets": [
+        "/var/run/docker.sock"
+      ],
+      "allowLocalBinding": true
     }
-}
+  }
+}

.gitattributes

@@ -0,0 +1,5 @@
+*.wasm binary
+*.ts linguist-language=TypeScript
+*.ts linguist-detectable=true
+*.ts linguist-vendored=false
+*.ts linguist-generated=false

.gitea/workflows/ui-release.yaml

@@ -0,0 +1,148 @@
+name: ui-release
+
+# Tier 2 (release) workflow. Runs on tag push.
+#
+# Currently mirrors the Tier 1 step set. Visual regression baseline
+# checks and the macOS-runner iOS smoke job are landed in later phases
+# of ui/PLAN.md and live as commented sections at the end of this file
+# until those phases ship.
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        shell: bash
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.work
+          cache: true
+
+      - name: Run Go tests
+        # client/ is the deprecated Fyne client; excluded from CI per
+        # ui/PLAN.md §74. -count=1 disables Go's test cache so a green
+        # run never depends on a previous runner's cached state. The
+        # backend suite is run with -p 1 because most backend packages
+        # spawn their own Postgres testcontainer, and parallel
+        # Postgres bootstraps starve each other on a constrained
+        # runner. pkg modules are listed one by one because ./pkg/...
+        # does not recurse across the independent go.work modules
+        # under pkg/.
+        run: |
+          go test -count=1 -p 1 ./backend/...
+          go test -count=1 \
+            ./gateway/... \
+            ./game/... \
+            ./ui/core/... \
+            ./pkg/calc/... \
+            ./pkg/connector/... \
+            ./pkg/cronutil/... \
+            ./pkg/error/... \
+            ./pkg/geoip/... \
+            ./pkg/model/... \
+            ./pkg/postgres/... \
+            ./pkg/redisconn/... \
+            ./pkg/schema/... \
+            ./pkg/storage/... \
+            ./pkg/transcoder/... \
+            ./pkg/util/...
+
+      - name: Set up pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 11.0.7
+
+      - name: Set up Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: pnpm
+          cache-dependency-path: ui/pnpm-lock.yaml
+
+      - name: Install npm dependencies
+        working-directory: ui
+        run: pnpm install --frozen-lockfile
+
+      - name: Install Playwright browsers
+        working-directory: ui/frontend
+        run: pnpm exec playwright install --with-deps
+
+      - name: Run Vitest
+        working-directory: ui/frontend
+        run: pnpm test
+
+      - name: Run Playwright
+        working-directory: ui/frontend
+        run: pnpm exec playwright test
+
+      - name: Upload Playwright report on failure
+        if: failure()
+        uses: actions/upload-artifact@v4
+        with:
+          name: playwright-report
+          path: ui/frontend/playwright-report/
+          retention-days: 14
+
+      - name: Upload Playwright traces on failure
+        if: failure()
+        uses: actions/upload-artifact@v4
+        with:
+          name: playwright-traces
+          path: ui/frontend/test-results/
+          retention-days: 14
+
+# visual-regression: enabled in Phase 33 of ui/PLAN.md, once the PWA
+# shell and service worker land and a snapshot baseline is committed
+# under ui/frontend/tests/__snapshots__/.
+#
+#  visual-regression:
+#    runs-on: ubuntu-latest
+#    needs: test
+#    steps:
+#      - uses: actions/checkout@v4
+#      - uses: pnpm/action-setup@v4
+#        with: { version: 11.0.7 }
+#      - uses: actions/setup-node@v4
+#        with:
+#          node-version: 22
+#          cache: pnpm
+#          cache-dependency-path: ui/pnpm-lock.yaml
+#      - working-directory: ui
+#        run: pnpm install --frozen-lockfile
+#      - working-directory: ui/frontend
+#        run: pnpm exec playwright install --with-deps
+#      - working-directory: ui/frontend
+#        run: pnpm exec playwright test --grep @visual
+
+# ios-smoke: enabled in Phase 32 of ui/PLAN.md, once the Capacitor
+# wrapper lands. Runs a Capacitor + Appium smoke against an iOS
+# simulator on a macOS runner.
+#
+#  ios-smoke:
+#    runs-on: macos-13
+#    needs: test
+#    steps:
+#      - uses: actions/checkout@v4
+#      - uses: pnpm/action-setup@v4
+#        with: { version: 11.0.7 }
+#      - uses: actions/setup-node@v4
+#        with:
+#          node-version: 22
+#          cache: pnpm
+#          cache-dependency-path: ui/pnpm-lock.yaml
+#      - working-directory: ui
+#        run: pnpm install --frozen-lockfile
+#      - working-directory: ui/mobile
+#        run: pnpm exec cap sync ios && pnpm exec appium-smoke ios

.gitea/workflows/ui-test.yaml

@@ -0,0 +1,128 @@
+name: ui-test
+
+# Tier 1 (per-PR) workflow. Runs Vitest + Playwright for the UI client and
+# the monorepo Go service tests (everything except the integration suite,
+# which lives behind `make -C integration integration` and needs a Docker
+# daemon set up for testcontainers).
+#
+# The path filter is intentionally broad until a dedicated go-test
+# workflow is introduced; this is the only CI gate today.
+
+on:
+  push:
+    paths:
+      - 'ui/**'
+      - 'backend/**'
+      - 'gateway/**'
+      - 'game/**'
+      - 'pkg/**'
+      - 'go.work'
+      - 'go.work.sum'
+      - '.gitea/workflows/ui-test.yaml'
+      # Skip docs-only commits. Negation removes pure markdown changes;
+      # mixed commits (code + .md) still match a positive pattern above
+      # and trigger the workflow. Image and other binary asset paths
+      # are already outside the positive list.
+      - '!**/*.md'
+  pull_request:
+    paths:
+      - 'ui/**'
+      - 'backend/**'
+      - 'gateway/**'
+      - 'game/**'
+      - 'pkg/**'
+      - 'go.work'
+      - 'go.work.sum'
+      - '.gitea/workflows/ui-test.yaml'
+      - '!**/*.md'
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        shell: bash
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.work
+          cache: true
+
+      - name: Run Go tests
+        # client/ is the deprecated Fyne client; excluded from CI per
+        # ui/PLAN.md §74. -count=1 disables Go's test cache so a green
+        # run never depends on a previous runner's cached state. The
+        # backend suite is run with -p 1 because most backend packages
+        # spawn their own Postgres testcontainer, and parallel
+        # Postgres bootstraps starve each other on a constrained
+        # runner. pkg modules are listed one by one because ./pkg/...
+        # does not recurse across the independent go.work modules
+        # under pkg/.
+        run: |
+          go test -count=1 -p 1 ./backend/...
+          go test -count=1 \
+            ./gateway/... \
+            ./game/... \
+            ./ui/core/... \
+            ./pkg/calc/... \
+            ./pkg/connector/... \
+            ./pkg/cronutil/... \
+            ./pkg/error/... \
+            ./pkg/geoip/... \
+            ./pkg/model/... \
+            ./pkg/postgres/... \
+            ./pkg/redisconn/... \
+            ./pkg/schema/... \
+            ./pkg/storage/... \
+            ./pkg/transcoder/... \
+            ./pkg/util/...
+
+      - name: Set up pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 11.0.7
+
+      - name: Set up Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: pnpm
+          cache-dependency-path: ui/pnpm-lock.yaml
+
+      - name: Install npm dependencies
+        working-directory: ui
+        run: pnpm install --frozen-lockfile
+
+      - name: Install Playwright browsers
+        working-directory: ui/frontend
+        run: pnpm exec playwright install --with-deps
+
+      - name: Run Vitest
+        working-directory: ui/frontend
+        run: pnpm test
+
+      - name: Run Playwright
+        working-directory: ui/frontend
+        run: pnpm exec playwright test
+
+      - name: Upload Playwright report on failure
+        if: failure()
+        uses: actions/upload-artifact@v4
+        with:
+          name: playwright-report
+          path: ui/frontend/playwright-report/
+          retention-days: 14
+
+      - name: Upload Playwright traces on failure
+        if: failure()
+        uses: actions/upload-artifact@v4
+        with:
+          name: playwright-traces
+          path: ui/frontend/test-results/
+          retention-days: 14

.gitignore

@@ -1,3 +1,16 @@
 .codex
 .vscode/
-artifacts/
+artifacts/.claude/scheduled_tasks.lock
+
+# Per-developer Claude Code overrides. The committed
+# `.claude/settings.json` holds the shared project defaults;
+# `settings.local.json` is each developer's local override
+# (looser permissions, disabled sandbox) and must not be staged.
+.claude/settings.local.json
+
+# Per-developer Vite dotenv overrides. The committed
+# `ui/frontend/.env.development` ships sane defaults for the
+# `tools/local-dev/` stack; `.local` siblings stay personal and
+# unstaged.
+**/.env.local
+**/.env.*.local

CLAUDE.md

@@ -30,19 +30,56 @@ This repository hosts the Galaxy Game project.
 
 - `galaxy/<service>/PLAN.md` — staged implementation plan for the service.
   May be already complete and resides for historical reasons.
-- `galaxy/<service>/docs/` — per-stage decision records
-  (one file per decision, re-organized after full implementation
-  of `PLAN.md`).
+- `galaxy/<service>/docs/` — live topic-based documentation that's
+  deeper than what fits in `README.md` (per-feature design notes,
+  protocol specs, runbooks). Not stage-by-stage history.
 
-## Decision records when implementing stages from PLAN.md
+## Per-stage CI gate
 
-- Stage-related discussion and decisions do NOT live in `README.md` or
-  `docs/ARCHITECTURE.md`. Those files describe the current state, not the history.
-- Each non-trivial decision gets its own `.md` under the module's `docs/`,
-  referenced from the relevant `README.md`.
-- Any agreement reached during interactive planning that is not obvious from
-  the code must be captured — either as a decision record or as an entry in
-  the module's README.
+Every completed stage from any `PLAN.md` (per-service or `ui/PLAN.md`)
+must be exercised on the local Gitea Actions runner before being
+declared done. The runbook lives in `tools/local-ci/README.md`; the
+short version is:
+
+1. Commit the stage changes.
+2. `make -C tools/local-ci push` — pushes `HEAD` to the local Gitea
+   instance and triggers every workflow that matches the changed
+   paths.
+3. Poll the latest run via the API snippet in `ui/docs/testing.md`
+   (or the Gitea UI on `http://localhost:3000`) until it leaves
+   `running`. Inspect the log on failure.
+4. Only after the run is `success` may the stage be marked done in
+   the corresponding `PLAN.md`.
+
+This applies even when the local unit-test suite is green —
+workflow-only failures (path filters, action-version mismatches,
+missing secrets, runner-only environment differences) are cheap to
+catch here and expensive to catch on a remote PR. The push step is
+implicitly authorised: do not ask for confirmation on every stage.
+
+If `tools/local-ci` is not running, bring it up first
+(`make -C tools/local-ci up`); do not skip this gate. The single
+exception is when the user explicitly waives it for a stage.
+
+## Decisions during stage implementation
+
+Stages from `PLAN.md` produce decisions. Those decisions never live in a
+separate per-decision history file. Instead, every non-obvious decision is
+baked back into the live state in three places:
+
+1. **The plan itself.** Update the relevant stage's text, acceptance
+   criteria, or targeted tests so it reflects what was decided. If
+   earlier already-implemented stages need to follow the new agreement,
+   correct their code, tests, and live docs in the same patch.
+2. **Later, not-yet-implemented stages.** When a decision affects later
+   stages — scope, dependencies, deliverables, or tests — update those
+   stages now, do not leave the future to re-derive them.
+3. **Live documentation.** Module `README.md`, project
+   `docs/ARCHITECTURE.md`, `docs/FUNCTIONAL.md` (with its
+   `docs/FUNCTIONAL_ru.md` mirror), the affected service `openapi.yaml`
+   or `*.proto`, and any topic doc under `galaxy/<service>/docs/` that
+   the decision touches. `README.md` and `ARCHITECTURE.md` always
+   describe current state, not the history of how it was reached.
 
 ## Scope of PLAN.md changes
 
@@ -82,8 +119,8 @@ details.
 The same behaviour is described in several parallel sources: code,
 `docs/ARCHITECTURE.md`, `docs/FUNCTIONAL.md` (with its Russian mirror
 `docs/FUNCTIONAL_ru.md`), the affected service `README.md`, the
-relevant `openapi.yaml` or `*.proto`, and the per-stage decision
-records under `galaxy/<service>/docs/`. They must never disagree.
+relevant `openapi.yaml` or `*.proto`, and the topic-based docs under
+`galaxy/<service>/docs/`. They must never disagree.
 
 - Any patch that changes user-visible behaviour, an API contract, or a
   cross-service flow updates every affected source in the same change
@@ -103,6 +140,22 @@ records under `galaxy/<service>/docs/`. They must never disagree.
   `docs/FUNCTIONAL_ru.md` (translate only the touched paragraphs).
   Skipping the mirror is treated as an incomplete patch.
 
+## Code compactness
+
+- Prefer compact code over speculative universality. Three similar
+  occurrences are not yet a pattern — wait for the third real caller
+  before extracting an abstraction.
+- Do not add seams, hooks, or configuration knobs for hypothetical
+  future requirements. If the next stage of `PLAN.md` will need
+  something, the next stage will add it.
+- A bug fix does not need surrounding cleanup; a one-shot operation
+  does not need a helper function; a single concrete value does not
+  need a parameter.
+- When the plan can be satisfied by reusing an existing function or
+  type, do that instead of introducing a new one.
+- This rule is about scope, not laziness — well-named identifiers,
+  precise types, and full test coverage stay non-negotiable.
+
 ## Dependencies
 
 - Before adding a new module, check its upstream repository for the latest

backend/PLAN.md

@@ -1,868 +0,0 @@
-# backend — Implementation Plan
-
-This plan has been already implemented and stays here for historical reasons.
-
-It should NOT be threated as source of truth for service functionality.
-
----
-
-## Summary
-
-This plan is the technical specification for implementing the
-consolidated Galaxy `backend` service. It is read together with
-`../docs/ARCHITECTURE.md` (architecture and security model) and
-`README.md` (module layout, configuration, operations).
-
-After reading those two documents and this plan, an implementing
-engineer should not need to ask architectural questions. Every stage is
-self-contained inside its domain area; stages run in order; each stage
-has explicit Critical files.
-
-The plan does not invent new domain concepts. It catalogues the work
-required to assemble what the architecture document already defines.
-
-## ~~Stage 1~~ — Repository cleanup
-
-This stage was implemented and marked as done.
-
-Goal: remove every module whose responsibility moves into `backend`,
-and prepare the workspace for the new module.
-
-Actions:
-
-1. `git rm -r authsession/ lobby/ mail/ notification/ gamemaster/
-   rtmanager/ geoprofile/ user/ integration/ pkg/redisconn/
-   pkg/notificationintent/`.
-2. Edit `go.work`:
-   - Remove `use` lines for the deleted modules.
-   - Remove `replace` lines for `galaxy/redisconn` and
-     `galaxy/notificationintent`.
-   - Do not add `./backend` yet — the module is created in Stage 2.
-3. Confirm that surviving modules still build:
-   `go build ./gateway/... ./game/... ./client/... ./pkg/...`.
-   Any compile error here means a surviving module imported a
-   removed package and must be patched (the only realistic culprit is
-   `gateway`, which references `pkg/redisconn` and the deleted streams;
-   patches there belong to Stage 6, not Stage 1 — for Stage 1 it is
-   acceptable to leave gateway broken if and only if the only failures
-   come from imports of removed packages).
-4. Run `go vet ./pkg/...` and confirm no diagnostic.
-
-Out of scope: any code change inside surviving modules. Stage 1 is
-purely deletion plus `go.work` edits.
-
-Critical files:
-
-- `go.work`
-- the deletion of `authsession/`, `lobby/`, `mail/`, `notification/`,
-  `gamemaster/`, `rtmanager/`, `geoprofile/`, `user/`, `integration/`,
-  `pkg/redisconn/`, `pkg/notificationintent/`.
-
-Done criteria:
-
-- `git status` shows only deletions plus the `go.work` edit.
-- `go build ./pkg/...` is clean.
-- `go vet ./pkg/...` is clean.
-
-## ~~Stage 2~~ — Backend skeleton & shared infrastructure
-
-This stage was implemented and marked as done.
-
-Goal: stand up the new module with its boot path, configuration,
-telemetry, logger, HTTP listener, Postgres pool, and gRPC listener — all
-with empty handlers. After this stage `go run ./backend/cmd/backend`
-must boot to a state where probes return 200 and migrations run (with an
-empty migration file).
-
-Actions:
-
-1. Create `backend/go.mod` with module path `galaxy/backend` and Go
-   version matching `go.work`. Add direct dependencies:
-   `github.com/gin-gonic/gin`, `github.com/jackc/pgx/v5`,
-   `github.com/go-jet/jet/v2`, `github.com/pressly/goose/v3`,
-   `go.uber.org/zap`, `go.opentelemetry.io/otel` and the OTLP
-   trace/metric exporters used by other services, and the `galaxy/*`
-   pkg modules (`postgres`, `model`, `geoip`, `cronutil`, `error`,
-   `util`).
-2. Add `./backend` to `go.work` `use(...)`.
-3. `backend/cmd/backend/main.go` — boot order:
-   1. Load `config.LoadFromEnv()`; `cfg.Validate()`.
-   2. Initialise telemetry (`telemetry.NewProcess(cfg.Telemetry)`). Set
-      global tracer and meter providers.
-   3. Construct the zap logger; inject trace fields helper.
-   4. Open Postgres pool. Apply embedded migrations with goose. Fail
-      fast on any error.
-   5. Construct module wiring (empty for now; populated in Stage 5).
-   6. Start the HTTP server (gin engine with empty route groups, plus
-      `/healthz` and `/readyz`).
-   7. Start the gRPC push server (no streams accepted yet — Stage 6).
-   8. Block on `signal.NotifyContext(ctx, SIGINT, SIGTERM)`; on signal,
-      drain in the order described in `README.md` §16.
-4. `backend/internal/config/config.go` — env-loader following the
-   pattern used by surviving services. Cover every variable listed in
-   `README.md` §4. Provide `DefaultConfig()` and `Validate()`.
-5. `backend/internal/telemetry/runtime.go` — port the existing service
-   pattern verbatim: configurable OTLP gRPC/HTTP exporter, optional
-   stdout exporter, Prometheus pull endpoint when configured. Expose
-   `TraceFieldsFromContext(ctx) []zap.Field`.
-6. `backend/internal/server/server.go` — gin engine, three empty route
-   groups, request id middleware, panic recovery middleware, otel
-   middleware. Probe handlers in `server/probes.go`.
-7. `backend/internal/postgres/pool.go` — pgx pool factory using the
-   shared `galaxy/postgres` helper.
-8. `backend/internal/postgres/migrations/00001_init.sql` — empty file
-   containing the `-- +goose Up` and `-- +goose Down` markers and a
-   single `CREATE SCHEMA IF NOT EXISTS backend;` statement so the
-   migration is non-empty and can be verified.
-9. `backend/internal/postgres/migrations/embed.go` — `embed.FS` and
-   exported `Migrations() fs.FS` helper.
-10. `backend/internal/push/server.go` — gRPC server skeleton bound to
-    `cfg.GRPCPushListenAddr`. No service registered yet.
-11. `backend/Makefile` — at minimum a `jet` target stub that prints
-    "not generated yet"; will be filled in Stage 4.
-
-Critical files:
-
-- `backend/go.mod`, `go.work`
-- `backend/cmd/backend/main.go`
-- `backend/internal/config/config.go`
-- `backend/internal/telemetry/runtime.go`
-- `backend/internal/server/server.go`, `backend/internal/server/probes.go`
-- `backend/internal/postgres/pool.go`,
-  `backend/internal/postgres/migrations/00001_init.sql`,
-  `backend/internal/postgres/migrations/embed.go`
-- `backend/internal/push/server.go`
-- `backend/Makefile`
-
-Done criteria:
-
-- `go build ./backend/...` is clean.
-- `go run ./backend/cmd/backend` starts, applies the placeholder
-  migration, opens HTTP and gRPC listeners, and serves `/healthz` 200
-  and `/readyz` 200.
-- Telemetry output (stdout exporter) shows trace and metric activity on
-  a probe hit.
-
-## ~~Stage~~ 3 — API contract & routing
-
-This stage was implemented and marked as done.
-
-Goal: define the entire backend REST contract in `openapi.yaml` and
-register every handler as a placeholder that returns
-`501 Not Implemented`. Wire the middleware stack for each route group.
-The contract test suite must validate every endpoint round-trip against
-the OpenAPI document and pass on the placeholders.
-
-Actions:
-
-1. Author `backend/openapi.yaml` — single document with three tags
-   (`Public`, `User`, `Admin`) and the endpoint set below. Reuse
-   schemas from `pkg/model` where possible; keep the rest under
-   `components/schemas/*`.
-2. Implement middleware in `backend/internal/server/middleware/`:
-   - `requestid` — assigns and propagates a request id (Stage 2 may
-     have already done this; consolidate here).
-   - `logging` — emits an access log entry with trace fields.
-   - `metrics` — counters and histograms per route group.
-   - `panicrecovery` — converts panics to 500 with structured logging.
-   - `userid` — required on `/api/v1/user/*`. Reads `X-User-ID`,
-     parses as UUID, places it in the request context. Rejects with
-     400 if missing or malformed. Backend trusts the value (see
-     architecture trust note).
-   - `basicauth` — required on `/api/v1/admin/*`. Stage 3 uses a stub
-     verifier that accepts any non-empty username and a fixed password
-     read from a test-only env var so contract tests can pass; Stage
-     5.3 replaces the verifier with the real Postgres-backed one.
-3. Implement handlers per endpoint in
-   `backend/internal/server/handlers_<group>_<topic>.go`. Every handler
-   returns `501 Not Implemented` with the standard error body
-   `{"error":{"code":"not_implemented","message":"..."}}`.
-4. Implement the contract test:
-   `backend/internal/server/contract_test.go`. Loads
-   `backend/openapi.yaml` via `kin-openapi`, builds the gin engine,
-   walks every operation, sends a representative request, and
-   validates both the request and response against the OpenAPI
-   document.
-5. Document `openapi.yaml` location and contract test pattern in
-   `backend/docs/api-contract.md` (a brief decision record).
-
-### Endpoint inventory
-
-Public (`/api/v1/public/*`):
-
-- `POST /auth/send-email-code` — request body `{email, locale?}`;
-  response `{challenge_id}`.
-- `POST /auth/confirm-email-code` — request body
-  `{challenge_id, code, client_public_key, time_zone}`; response
-  `{device_session_id}`.
-
-Probes (root):
-
-- `GET /healthz` — `200` always when the process is alive.
-- `GET /readyz` — `200` once Postgres reachable, migrations applied,
-  gRPC listener bound; `503` otherwise.
-
-User (`/api/v1/user/*`, all require `X-User-ID`):
-
-- `GET /account` — current account view (profile + settings +
-  entitlements).
-- `PATCH /account/profile` — update mutable profile fields
-  (`display_name`).
-- `PATCH /account/settings` — update `preferred_language`, `time_zone`.
-- `POST /account/delete` — soft delete; cascade is in process.
-
-- `GET /lobby/games` — public list with paging.
-- `POST /lobby/games` — create.
-- `GET /lobby/games/{game_id}`.
-- `PATCH /lobby/games/{game_id}`.
-- `POST /lobby/games/{game_id}/open-enrollment`.
-- `POST /lobby/games/{game_id}/ready-to-start`.
-- `POST /lobby/games/{game_id}/start`.
-- `POST /lobby/games/{game_id}/pause`.
-- `POST /lobby/games/{game_id}/resume`.
-- `POST /lobby/games/{game_id}/cancel`.
-- `POST /lobby/games/{game_id}/retry-start`.
-- `POST /lobby/games/{game_id}/applications`.
-- `POST /lobby/games/{game_id}/applications/{application_id}/approve`.
-- `POST /lobby/games/{game_id}/applications/{application_id}/reject`.
-- `POST /lobby/games/{game_id}/invites`.
-- `POST /lobby/games/{game_id}/invites/{invite_id}/redeem`.
-- `POST /lobby/games/{game_id}/invites/{invite_id}/decline`.
-- `POST /lobby/games/{game_id}/invites/{invite_id}/revoke`.
-- `GET /lobby/games/{game_id}/memberships`.
-- `POST /lobby/games/{game_id}/memberships/{membership_id}/remove`.
-- `POST /lobby/games/{game_id}/memberships/{membership_id}/block`.
-
-- `GET /lobby/my/games`.
-- `GET /lobby/my/applications`.
-- `GET /lobby/my/invites`.
-- `GET /lobby/my/race-names`.
-
-- `POST /lobby/race-names/register` — promote a `pending_registration`
-  to `registered` within the 30-day window.
-
-- `POST /games/{game_id}/commands` — proxy to engine command path.
-- `POST /games/{game_id}/orders` — proxy to engine order validation.
-- `GET /games/{game_id}/reports/{turn}` — proxy to engine report path.
-
-Admin (`/api/v1/admin/*`, all require Basic Auth):
-
-- `GET /admin-accounts`, `POST /admin-accounts`,
-  `GET /admin-accounts/{username}`,
-  `POST /admin-accounts/{username}/disable`,
-  `POST /admin-accounts/{username}/enable`,
-  `POST /admin-accounts/{username}/reset-password`.
-
-- `GET /users`, `GET /users/{user_id}`,
-  `POST /users/{user_id}/sanctions`,
-  `POST /users/{user_id}/limits`,
-  `POST /users/{user_id}/entitlements`,
-  `POST /users/{user_id}/soft-delete`.
-
-- `GET /games`, `GET /games/{game_id}`,
-  `POST /games/{game_id}/force-start`,
-  `POST /games/{game_id}/force-stop`,
-  `POST /games/{game_id}/ban-member`.
-
-- `GET /runtimes/{game_id}`,
-  `POST /runtimes/{game_id}/restart`,
-  `POST /runtimes/{game_id}/patch`,
-  `POST /runtimes/{game_id}/force-next-turn`,
-  `GET /engine-versions`, `POST /engine-versions`,
-  `PATCH /engine-versions/{id}`,
-  `POST /engine-versions/{id}/disable`.
-
-- `GET /mail/deliveries`,
-  `GET /mail/deliveries/{delivery_id}`,
-  `GET /mail/deliveries/{delivery_id}/attempts`,
-  `POST /mail/deliveries/{delivery_id}/resend`,
-  `GET /mail/dead-letters`.
-
-- `GET /notifications`, `GET /notifications/{notification_id}`,
-  `GET /notifications/dead-letters`,
-  `GET /notifications/malformed`.
-
-- `GET /geo/users/{user_id}/countries` — counter listing.
-
-Internal (gateway-only, `/api/v1/internal/*`):
-
-- `GET /sessions/{device_session_id}` — gateway session lookup.
-- `POST /sessions/{device_session_id}/revoke` — admin or self revoke
-  passthrough; backend emits `session_invalidation`.
-- `POST /sessions/users/{user_id}/revoke-all`.
-- `GET /users/{user_id}/account-internal` — server-to-server fetch
-  used by gateway flows that need account state alongside the session.
-
-The internal group is on `/api/v1/internal/*`. The trust model treats
-it as part of the user surface (no extra auth in MVP).
-
-Critical files:
-
-- `backend/openapi.yaml`
-- `backend/internal/server/router.go`
-- `backend/internal/server/middleware/{requestid,logging,metrics,panicrecovery,userid,basicauth}.go`
-- `backend/internal/server/handlers_*.go`
-- `backend/internal/server/contract_test.go`
-- `backend/docs/api-contract.md`
-
-Done criteria:
-
-- `go test ./backend/internal/server/...` is green; the contract test
-  exercises every endpoint and validates against `openapi.yaml`.
-- Every endpoint returns `501 Not Implemented` with the standard error
-  body.
-- gin route table at startup matches the OpenAPI inventory exactly.
-
-## ~~Stage 4~~ — Persistence layer
-
-This stage was implemented and marked as done.
-
-Goal: define every `backend` schema table, generate jet code, and make
-the wiring of the persistence layer ready for the domain modules.
-
-Actions:
-
-1. Replace `backend/internal/postgres/migrations/00001_init.sql` with
-   the full DDL. The schema is `backend`. The expected tables and
-   their primary purposes:
-
-   Auth:
-   - `device_sessions(device_session_id uuid pk, user_id uuid not null,
-     client_public_key bytea not null, status text not null,
-     created_at, revoked_at, last_seen_at)` plus indexes on
-     `user_id` and `status`.
-   - `auth_challenges(challenge_id uuid pk, email text not null,
-     code_hash bytea not null, created_at, expires_at, consumed_at,
-     attempts int not null default 0)`. Index on `email`.
-   - `blocked_emails(email text pk, blocked_at, reason text)`.
-
-   User:
-   - `accounts(user_id uuid pk, email text unique not null,
-     user_name text unique not null, display_name text not null,
-     preferred_language text not null, time_zone text not null,
-     declared_country text, permanent_block bool not null default false,
-     created_at, updated_at, deleted_at)`.
-   - `entitlement_records(record_id uuid pk, user_id uuid not null,
-     tier text not null, source text not null, created_at)`.
-   - `entitlement_snapshots(user_id uuid pk, tier text not null,
-     max_registered_race_names int not null, taken_at timestamptz)`.
-     Updated on every entitlement change.
-   - `sanction_records`, `sanction_active`, `limit_records`,
-     `limit_active` — same shape as the previous `user` service had
-     (record + active rollup pattern).
-
-   Admin:
-   - `admin_accounts(username text pk, password_hash bytea not null,
-     created_at, last_used_at, disabled_at)`.
-
-   Lobby:
-   - `games(game_id uuid pk, owner_user_id uuid not null,
-     visibility text not null, status text not null, ...)` covering
-     enrollment state machine fields documented in
-     `ARCHITECTURE_deprecated.md` § Game Lobby.
-   - `applications(application_id uuid pk, game_id uuid not null,
-     applicant_user_id uuid not null, status text not null, ...)`.
-   - `invites(invite_id uuid pk, game_id uuid not null,
-     invited_user_id uuid, code text unique, status text, ...)`.
-   - `memberships(membership_id uuid pk, game_id uuid not null,
-     user_id uuid not null, race_name text not null, status text,
-     ...)` plus `unique(game_id, user_id)`.
-   - `race_names(name text not null, canonical text not null,
-     status text not null, owner_user_id uuid, game_id uuid,
-     expires_at, registered_at, ...)` plus
-     `unique(canonical) where status in ('registered','reservation','pending_registration')`.
-
-   Runtime:
-   - `runtime_records(game_id uuid pk, current_container_id text,
-     status text not null, image_ref text, started_at, last_observed_at,
-     ...)`.
-   - `engine_versions(version text pk, image_ref text not null,
-     enabled bool not null default true, created_at, ...)`.
-   - `player_mappings(game_id uuid not null, user_id uuid not null,
-     race_name text not null, engine_player_uuid uuid not null,
-     primary key(game_id, user_id))`.
-   - `runtime_operation_log(operation_id uuid pk, game_id uuid,
-     op text, status text, started_at, finished_at, error text)`.
-   - `runtime_health_snapshots(snapshot_id uuid pk, game_id uuid,
-     observed_at, payload jsonb)`.
-
-   Mail:
-   - `mail_deliveries(delivery_id uuid pk, template_id text not null,
-     idempotency_key text not null, status text not null,
-     attempts int not null default 0, next_attempt_at timestamptz,
-     payload_id uuid not null, created_at, ...)` plus
-     `unique(template_id, idempotency_key)`.
-   - `mail_recipients(recipient_id uuid pk, delivery_id uuid not null,
-     address text not null, kind text not null)`.
-   - `mail_attempts(attempt_id uuid pk, delivery_id uuid, attempt_no int,
-     started_at, finished_at, outcome text, error text)`.
-   - `mail_dead_letters(dead_letter_id uuid pk, delivery_id uuid,
-     archived_at, reason text)`.
-   - `mail_payloads(payload_id uuid pk, content_type text not null,
-     subject text, body bytea not null)`.
-
-   Notification:
-   - `notifications(notification_id uuid pk, kind text not null,
-     idempotency_key text not null, user_id uuid, payload jsonb,
-     created_at)` plus `unique(kind, idempotency_key)`.
-   - `notification_routes(route_id uuid pk, notification_id uuid,
-     channel text not null, status text not null, last_attempt_at,
-     ...)`.
-   - `notification_dead_letters(dead_letter_id uuid pk, notification_id
-     uuid, archived_at, reason text)`.
-   - `notification_malformed_intents(id uuid pk, received_at, payload
-     jsonb, reason text)`.
-
-   Geo:
-   - `user_country_counters(user_id uuid not null, country text not null,
-     count bigint not null default 0, last_seen_at timestamptz,
-     primary key(user_id, country))`.
-
-2. Add `created_at TIMESTAMPTZ DEFAULT now()` to every table; add
-   `updated_at` and `deleted_at` where the domain reasons in
-   `ARCHITECTURE_deprecated.md` apply. UTC normalisation is performed
-   in Go on read and write (the existing `pkg/postgres` helpers cover
-   this).
-
-3. `backend/cmd/jetgen/main.go` — port the existing pattern from a
-   surviving reference (the previous services' `cmd/jetgen` is a good
-   template; adjust import paths to `galaxy/backend`). The tool spins
-   up a transient Postgres container, applies the embedded migrations,
-   and runs `jet -dsn=...` writing into `internal/postgres/jet/`.
-
-4. `backend/Makefile` — fill in the `jet` target.
-
-5. Run `make jet` and commit `internal/postgres/jet/`.
-
-6. Add `backend/internal/postgres/jet/jet.go` — package doc and
-   `//go:generate` comment pointing to `cmd/jetgen`.
-
-7. Sanity test in `backend/internal/postgres/migrations_test.go`:
-   spin up a Postgres testcontainer, apply migrations, assert that
-   the `backend` schema exists and that every expected table is
-   present.
-
-Critical files:
-
-- `backend/internal/postgres/migrations/00001_init.sql`
-- `backend/internal/postgres/jet/**`
-- `backend/cmd/jetgen/main.go`
-- `backend/Makefile`
-- `backend/internal/postgres/migrations_test.go`
-
-Done criteria:
-
-- `go test ./backend/internal/postgres/...` is green.
-- `make jet` regenerates without diff.
-- All tables listed above exist after a fresh migration.
-
-## ~~Stage 5~~ — Domain implementation
-
-Goal: implement domain modules in dependency order. After each substage
-the backend is functional for the substage's slice of behaviour. The
-contract tests from Stage 3 progressively flip from `501` to actual
-responses as each substage replaces placeholders.
-
-Substages run strictly in order. Each substage:
-
-- Implements package code in `backend/internal/<domain>/`.
-- Replaces the corresponding `501` handler bodies in
-  `backend/internal/server/handlers_*.go` with real logic that calls
-  the domain package.
-- Adds focused unit and contract coverage for the substage's
-  endpoints.
-- Wires the new package into `backend/cmd/backend/main.go`.
-
-### ~~5.1~~ — auth
-
-This substage was implemented and marked as done. See
-[`docs/stage05_1-auth.md`](docs/stage05_1-auth.md) for the decisions
-taken during implementation.
-
-Behaviour:
-
-- `POST /api/v1/public/auth/send-email-code` — generates a challenge,
-  hashes the code, persists in `auth_challenges`, calls
-  `mail.EnqueueLoginCode(email, code)`. Returns `{challenge_id}` for
-  every non-blocked email (existing user, new user, throttled — all
-  return identical shape; blocked email rejects with 400 only when the
-  block is permanent).
-- `POST /api/v1/public/auth/confirm-email-code` — looks up the
-  challenge, verifies the code (constant-time), enforces attempt
-  ceiling, marks consumed, calls `user.EnsureByEmail(email,
-  preferred_language, time_zone)` to obtain the user_id, stores the
-  Ed25519 public key, creates a `device_session` row, populates the
-  in-memory cache, calls
-  `geo.SetDeclaredCountryAtRegistration(user_id, source_ip)`, and
-  returns `{device_session_id}`.
-- `GET /api/v1/internal/sessions/{device_session_id}` — sync session
-  lookup for gateway.
-- `POST /api/v1/internal/sessions/{device_session_id}/revoke` and
-  `POST /api/v1/internal/sessions/users/{user_id}/revoke-all` — mark
-  sessions revoked, evict from in-memory cache, emit
-  `session_invalidation` push event (Stage 6 wires the actual
-  emission; until then `auth` calls a no-op publisher injected at
-  wiring).
-
-Cache: full session table read at startup; write-through on every
-mutation.
-
-### ~~5.2~~ — user
-
-This substage was implemented and marked as done. See
-[`docs/stage05_2-user.md`](docs/stage05_2-user.md) for the decisions
-taken during implementation.
-
-Behaviour:
-
-- Account CRUD limited to allowed mutations on profile and settings.
-- `EnsureByEmail` and `ResolveByEmail` for `auth`.
-- Entitlement records and snapshots; tier downgrades never revoke
-  already-registered race names.
-- Sanctions and limits using the record + active rollup pattern.
-- Soft delete: writes `deleted_at` and triggers in-process cascade —
-  `lobby.OnUserDeleted(user_id)`, `notification.OnUserDeleted(user_id)`,
-  `geo.OnUserDeleted(user_id)`. Permanent block triggers
-  `lobby.OnUserBlocked(user_id)`.
-- Cache: latest entitlement snapshot per user; warmed on startup;
-  write-through on entitlement mutation.
-
-### ~~5.3~~ — admin
-
-This substage was implemented and marked as done. See
-[`docs/stage05_3-admin.md`](docs/stage05_3-admin.md) for the decisions
-taken during implementation.
-
-Behaviour:
-
-- `admin_accounts` CRUD with bcrypt hashing.
-- Bootstrap on startup via env vars (`BACKEND_ADMIN_BOOTSTRAP_USER`,
-  `BACKEND_ADMIN_BOOTSTRAP_PASSWORD`); idempotent.
-- Replace the Stage 3 stub `basicauth` middleware with the real
-  Postgres-backed verifier. Constant-time comparison via bcrypt.
-- Admin CRUD endpoints across users, games, runtime, mail,
-  notification, geo. Each admin endpoint delegates to the domain
-  package's admin-facing methods.
-
-Cache: full admin table at startup; write-through on mutation.
-
-### ~~5.4~~ — lobby
-
-This substage was implemented and marked as done. See
-[`docs/stage05_4-lobby.md`](docs/stage05_4-lobby.md) for the decisions
-taken during implementation.
-
-Behaviour:
-
-- Games CRUD with the enrollment state machine.
-- Applications and invites with their lifecycles.
-- Memberships with race name binding.
-- Race Name Directory: registered, reservation, and
-  pending_registration tiers; canonical key via `disciplinedware/go-confusables`;
-  uniqueness across all three tiers; capability promotion based on
-  `max_planets > initial AND max_population > initial` from the
-  runtime snapshot.
-- Pending-registration sweeper: scheduled job, releases entries past
-  the 30-day window; uses `pkg/cronutil`. The same sweeper auto-closes
-  enrollment-expired games whose `approved_count >= min_players`.
-- Hooks consumed from other modules:
-  - `OnUserBlocked(user_id)` — release all RND/applications/invites/
-    memberships in one transaction.
-  - `OnUserDeleted(user_id)` — same.
-  - `OnRuntimeSnapshot(snapshot)` — update denormalised runtime view
-    on the game (current_turn, status, per-member max stats).
-  - `OnGameFinished(game_id)` — drive race name promotion logic and
-    move game to `finished`.
-
-Cache: active games and memberships, RND canonical set; warmed on
-startup; write-through on mutation.
-
-### ~~5.5~~ — runtime (with dockerclient and engineclient)
-
-This substage was implemented and marked as done. See
-[`docs/stage05_5-runtime.md`](docs/stage05_5-runtime.md) for the
-decisions taken during implementation.
-
-Behaviour:
-
-- Engine version registry CRUD.
-- `engineclient` is a thin `net/http` client over `pkg/model` types,
-  one method per engine endpoint listed in `README.md` §8.
-- `dockerclient` wraps `github.com/docker/docker` for: pull, create,
-  start, stop, remove, inspect, list (filtered by the
-  `galaxy.backend=1` label), patch (semver-only, validated against
-  `engine_versions`).
-- Per-game serialisation: a `sync.Map[game_id]*sync.Mutex` ensures
-  concurrent ops on the same game are sequential.
-- Worker pool for long-running operations: started in Stage 5.5; jobs
-  enqueued on a buffered channel; bounded concurrency.
-- `runtime_operation_log` records every op (start time, finish time,
-  outcome, error).
-- Reconciliation: on startup and on a `pkg/cronutil` schedule, list
-  containers labelled `galaxy.backend=1`, match against
-  `runtime_records`, adopt unrecorded labelled containers, mark
-  recorded but missing as removed. Emit
-  `lobby.OnRuntimeJobResult` for each removed.
-- Snapshot publication: after every successful engine read or a
-  health-probe transition, synthesise a snapshot and call
-  `lobby.OnRuntimeSnapshot(snapshot)` synchronously.
-- Turn scheduler: `pkg/cronutil` schedule per running game; each tick
-  invokes the engine `admin/turn`, on success snapshots and publishes;
-  force-next-turn sets a one-shot skip flag stored in
-  `runtime_records`.
-
-Cache: active runtime records, engine version registry; warmed on
-startup; write-through on mutation.
-
-### ~~5.6~~ — mail
-
-This substage was implemented and marked as done. See
-[`docs/stage05_6-mail.md`](docs/stage05_6-mail.md) for the decisions
-taken during implementation.
-
-Behaviour:
-
-- Outbox tables defined in Stage 4.
-- Worker goroutine: scans `mail_deliveries` with
-  `SELECT ... FOR UPDATE SKIP LOCKED` ordered by `next_attempt_at`,
-  attempts SMTP delivery via `wneessen/go-mail`, records in
-  `mail_attempts`, updates status, schedules backoff with jitter, or
-  dead-letters past the configured maximum attempts.
-- Drain on startup: replays all `pending` and `retrying` rows.
-- Public API for producers: `EnqueueLoginCode(email, code, ttl)`,
-  `EnqueueTemplate(template_id, recipient, payload, idempotency_key)`.
-- Admin endpoints implemented: list, view, resend.
-
-### ~~5.7~~ — notification
-
-This substage was implemented and marked as done. See
-[`docs/stage05_7-notification.md`](docs/stage05_7-notification.md) for
-the decisions taken during implementation.
-
-Behaviour:
-
-- `Submit(intent)` — validate intent shape, enforce idempotency,
-  persist `notifications`, materialise `notification_routes`, fan out
-  to push (Stage 6 wires the actual push emission; until then a no-op
-  publisher) and email (`mail.EnqueueTemplate`).
-- Each kind has a fixed channel set documented in `README.md` §10.
-- Malformed intents go to `notification_malformed_intents` and never
-  block the producer.
-- Dead-letter handling: a failed route past max attempts moves to
-  `notification_dead_letters`.
-- Producers (lobby, runtime, geo, auth) are wired via direct function
-  calls.
-
-### ~~5.8~~ — geo
-
-This substage was implemented and marked as done. See
-[`docs/stage05_8-geo.md`](docs/stage05_8-geo.md) for the decisions
-taken during implementation.
-
-Behaviour:
-
-- Load GeoLite2 Country DB at startup from `BACKEND_GEOIP_DB_PATH`.
-- `SetDeclaredCountryAtRegistration(user_id, ip)` — sync; lookup,
-  update `accounts.declared_country`. No-op on lookup error.
-- `IncrementCounterAsync(user_id, ip)` — fire-and-forget goroutine;
-  upsert `user_country_counters` with `count = count + 1`,
-  `last_seen_at = now()`.
-- Middleware on `/api/v1/user/*` extracts the source IP from
-  `X-Forwarded-For` (or `RemoteAddr`) and calls
-  `IncrementCounterAsync` after the handler returns successfully.
-- `OnUserDeleted(user_id)` — delete the user's counter rows.
-
-Critical files (Stage 5 as a whole):
-
-- `backend/internal/auth/**`
-- `backend/internal/user/**`
-- `backend/internal/admin/**`
-- `backend/internal/lobby/**`
-- `backend/internal/runtime/**`
-- `backend/internal/dockerclient/**`
-- `backend/internal/engineclient/**`
-- `backend/internal/mail/**`
-- `backend/internal/notification/**`
-- `backend/internal/geo/**`
-- `backend/internal/server/handlers_*.go` (replacing 501 stubs)
-- `backend/cmd/backend/main.go` (wiring expansion)
-
-Done criteria:
-
-- All Stage 3 contract tests pass against real responses.
-- Each substage adds focused unit tests (`testify`, mocks where
-  external boundaries justify them).
-- `go run ./backend/cmd/backend` boots, all caches warm, all workers
-  start.
-
-## ~~Stage 6~~ — Push gRPC interface and gateway adaptation
-
-Goal: stand up the bidirectional control channel between backend and
-gateway. Backend pushes `client_event` and `session_invalidation`;
-gateway opens the stream, signs and forwards client events, immediately
-acts on session invalidations. Remove every Redis dependency from
-gateway except anti-replay reservations.
-
-### ~~6.1~~ — Backend push server
-
-This substage was implemented and marked as done. See
-[`docs/stage06_1-push.md`](docs/stage06_1-push.md) for the decisions
-taken during implementation.
-
-Actions:
-
-1. Author `backend/proto/push/v1/push.proto` with
-   `service Push { rpc SubscribePush(GatewaySubscribeRequest) returns
-   (stream PushEvent); }` and the message types defined in
-   `README.md` §7. Include a `cursor` field (string).
-2. `backend/buf.yaml`, `backend/buf.gen.yaml` mirroring the gateway
-   pattern; generate Go bindings into `backend/proto/push/v1/`.
-3. `backend/internal/push/server.go` — gRPC service implementation:
-   - Maintains a connection registry keyed by gateway client id (the
-     `GatewaySubscribeRequest` provides one; if multiple gateway
-     instances connect, each gets its own queue).
-   - Holds an in-memory ring buffer keyed by cursor, with TTL equal to
-     `BACKEND_FRESHNESS_WINDOW`. Cursors past TTL are discarded.
-   - Resume: if the client's cursor is still in the buffer, replay
-     from there; otherwise replay nothing and start fresh.
-   - Backpressure: per-connection buffered channel; on overflow, drop
-     the oldest events for that connection and log.
-4. Provide a publisher API consumed by `auth`, `lobby`, `notification`,
-   and `runtime`:
-   - `push.PublishClientEvent(user_id, device_session_id?, payload, kind)`.
-   - `push.PublishSessionInvalidation(device_session_id|user_id, reason)`.
-
-### ~~6.2~~ — Gateway adaptation
-
-This substage was implemented and marked as done. See
-[`docs/stage06_2-gateway.md`](docs/stage06_2-gateway.md) for the
-decisions taken during implementation.
-
-Actions:
-
-1. Remove `redisconn` usage for session projection and for the two
-   stream consumers. Keep `redisconn` only for anti-replay
-   reservations.
-2. Remove `gateway/internal/config` env vars
-   `GATEWAY_SESSION_EVENTS_REDIS_STREAM` and
-   `GATEWAY_CLIENT_EVENTS_REDIS_STREAM`. Add
-   `GATEWAY_BACKEND_HTTP_URL` and `GATEWAY_BACKEND_GRPC_PUSH_URL`.
-3. Add `gateway/internal/backendclient/` with:
-   - `RESTClient` — HTTP client for `/api/v1/internal/sessions/...` and
-     for forwarding public/user requests.
-   - `PushClient` — gRPC client to `SubscribePush` with reconnect
-     loop, exponential backoff with jitter, and cursor persistence in
-     process memory.
-4. Replace gateway session validation with a sync REST call to
-   backend per request.
-5. Replace gateway client-events Redis consumer with the
-   `SubscribePush` consumer. On `client_event`: sign envelope (Ed25519)
-   and deliver to the matching client subscription. On
-   `session_invalidation`: look up active subscriptions for the target
-   sessions, close them, and reject any in-flight authenticated
-   request bound to those sessions.
-6. Anti-replay request_id reservations remain in Redis (unchanged).
-7. Update gateway tests to use a mocked backend HTTP and gRPC server.
-
-Critical files:
-
-- `backend/proto/push/v1/push.proto`
-- `backend/buf.yaml`, `backend/buf.gen.yaml`
-- `backend/internal/push/server.go`,
-  `backend/internal/push/publisher.go`
-- `gateway/internal/backendclient/*.go`
-- `gateway/internal/config/config.go` (env var changes)
-- `gateway/internal/handlers/*.go` (route forwarding to backend)
-- `gateway/internal/auth/*.go` (session lookup → REST)
-- `gateway/internal/eventfanout/*.go` (replace Redis consumer with
-  gRPC consumer; rename if helpful)
-
-Done criteria:
-
-- `go run ./backend/cmd/backend` and `go run ./gateway/cmd/gateway`
-  cooperate end-to-end with no Redis stream usage.
-- A revocation through the admin surface causes immediate stream
-  closure on the affected client.
-- Gateway anti-replay still rejects duplicates.
-- gateway test suite green.
-
-## ~~Stage 7~~ — Integration testing
-
-This stage was implemented and marked as done. See
-[`docs/stage07-integration.md`](docs/stage07-integration.md) for the
-decisions taken during implementation, including the testenv layout,
-the signed-envelope gRPC client, and the per-scenario coverage notes.
-
-Goal: end-to-end coverage of the platform with real binaries and real
-infrastructure where practical.
-
-Actions:
-
-1. Recreate the top-level `integration/` module, registered in
-   `go.work`. The module hosts black-box test suites that drive
-   `gateway` from outside and verify behaviour at the public boundary
-   (with `backend` and `game` running in containers).
-2. Add testcontainers fixtures: Postgres, an SMTP capture server (for
-   example `axllent/mailpit`), the `galaxy/game` engine image, the
-   `galaxy/backend` image (built from this repo), and the
-   `galaxy/gateway` image. The Docker daemon used by testcontainers
-   is the same one backend will use to manage engines.
-3. Add a synthetic GeoLite2 mmdb (use `pkg/geoip/test-data/`).
-4. Cover scenarios:
-   - Registration flow: send-email-code → confirm-email-code →
-     `declared_country` populated from synthetic mmdb.
-   - User account fetch: `X-User-ID` path returns the expected
-     account; geo counter increments per request.
-   - Lobby flow: create game → invite → application → ready-to-start
-     → start (engine container starts, healthz green, status read) →
-     command → force-next-turn → finish → race name promotion.
-   - Mail flow: trigger an email-bound notification → SMTP capture
-     receives it → admin resend works.
-   - Notification flow: lobby invite triggers a push event reaching
-     the test client's gateway subscription, plus an email captured
-     by SMTP.
-   - Admin flow: bootstrap admin authenticates; CRUD admin creates a
-     second admin; second admin disables the first.
-   - Soft delete flow: user soft-delete cascades; their RND entries,
-     memberships, applications, invites, geo counters are released
-     or removed.
-   - Session revocation: admin revokes a session → push
-     `session_invalidation` arrives at gateway → active subscription
-     closes; subsequent requests with that `device_session_id`
-     rejected by gateway.
-   - Anti-replay: same `request_id` replayed within freshness window
-     is rejected by gateway.
-5. CI: run `go test ./integration/... -tags=integration` (or whichever
-   flag the team prefers). Tests requiring real Docker run only when
-   a Docker daemon is available; otherwise they skip with a clear
-   message.
-
-Critical files:
-
-- `integration/go.mod`
-- `integration/auth_flow_test.go`
-- `integration/lobby_flow_test.go`
-- `integration/mail_flow_test.go`
-- `integration/notification_flow_test.go`
-- `integration/admin_flow_test.go`
-- `integration/soft_delete_test.go`
-- `integration/session_revoke_test.go`
-- `integration/anti_replay_test.go`
-- `integration/testenv/*.go` (shared fixtures)
-
-Done criteria:
-
-- `go test ./integration/...` runs the full suite.
-- All listed scenarios pass green on a developer machine with Docker
-  available.
-- Failures produce actionable diagnostics (logs from each component
-  attached to the test report).
-
-## Stage acceptance and decision records
-
-After each stage, the implementing engineer writes a short decision
-record under `backend/docs/stage<NN>-<topic>.md` capturing any
-non-trivial choice made during implementation that is not obvious from
-the code or from this plan. Records that contradict this plan must be
-brought to the architecture conversation before merge — the plan and
-the architecture document are the agreed contract.

backend/README.md

@@ -333,15 +333,42 @@ cannot guarantee.
 | `runtime.image_pull_failed`         | admin email   | `game_id`, `image_ref`                                   |
 | `runtime.container_start_failed`    | admin email   | `game_id`                                                |
 | `runtime.start_config_invalid`      | admin email   | `game_id`, `reason`                                      |
+| `game.turn.ready`                   | push          | `game_id`, `turn`                                        |
+| `game.paused`                       | push          | `game_id`, `turn`, `reason`                              |
 
 Admin-channel kinds (`runtime.*`) deliver email to
 `BACKEND_NOTIFICATION_ADMIN_EMAIL`; when the variable is empty, those
 routes land in `notification_routes` with `status='skipped'` and the
 operator log line records the configuration miss.
 
-`game.*` (`game.started`, `game.turn.ready`, `game.generation.failed`,
-`game.finished`) and `mail.dead_lettered` are reserved kinds without a
-producer in the catalog; adding them is an additive change to the
+`game.turn.ready` and `game.paused` are emitted by
+`lobby.Service.OnRuntimeSnapshot`
+(`backend/internal/lobby/runtime_hooks.go`):
+
+- `game.turn.ready` fires whenever the engine's `current_turn`
+  advances. Idempotency key `turn-ready:<game_id>:<turn>`, JSON
+  payload `{game_id, turn}`.
+- `game.paused` fires whenever the same hook flips the game
+  `running → paused` because a runtime snapshot landed with
+  `engine_unreachable` / `generation_failed`. Idempotency key
+  `paused:<game_id>:<turn>`, JSON payload
+  `{game_id, turn, reason}` (reason carries the runtime status
+  that triggered the transition). The runtime scheduler
+  (`backend/internal/runtime/scheduler.go`) forwards the failing
+  snapshot through `Service.publishFailureSnapshot` so a single
+  failing tick reliably reaches lobby.
+
+Both kinds target every active membership and route through the
+push channel only — per-turn / per-pause email would be spam — so
+the UI's signed `SubscribeEvents` stream
+(`ui/frontend/src/api/events.svelte.ts`) is the sole delivery
+path. The order tab consumes them via
+`OrderDraftStore.resetForNewTurn` / `markPaused`
+(`ui/docs/sync-protocol.md`).
+
+The remaining `game.*` (`game.started`, `game.generation.failed`,
+`game.finished`) and `mail.dead_lettered` are reserved kinds without
+a producer in the catalog; adding them is an additive change to the
 catalog vocabulary and the migration CHECK constraint.
 
 Templates ship in English only; localisation belongs to clients that

backend/cmd/backend/main.go

@@ -13,10 +13,18 @@ import (
 	"os/signal"
 	"syscall"
 
+	// time/tzdata embeds the IANA timezone database so time.LoadLocation
+	// works in container images without /usr/share/zoneinfo (distroless
+	// static, alpine without the tzdata apk). The auth and user-settings
+	// flows validate the caller's `time_zone` via time.LoadLocation;
+	// without this import only "UTC" and fixed offsets would resolve.
+	_ "time/tzdata"
+
 	"galaxy/backend/internal/admin"
 	"galaxy/backend/internal/app"
 	"galaxy/backend/internal/auth"
 	"galaxy/backend/internal/config"
+	"galaxy/backend/internal/devsandbox"
 	"galaxy/backend/internal/dockerclient"
 	"galaxy/backend/internal/engineclient"
 	"galaxy/backend/internal/geo"
@@ -258,6 +266,29 @@ func run(ctx context.Context) (err error) {
 	)
 	runtimeGateway.svc = runtimeSvc
 
+	// Run a single reconciliation pass before the dev-sandbox
+	// bootstrap so any runtime row pointing at a vanished engine
+	// container (host reboot wiped /tmp/galaxy-game-state/<uuid>;
+	// `tools/local-dev`'s `prune-broken-engines` target reaped the
+	// husk) is already cascaded through `markRemoved` → lobby
+	// `cancelled` by the time the bootstrap walks the sandbox list.
+	// Without this pre-tick the bootstrap would reuse the
+	// soon-to-be-cancelled game and force the developer into a
+	// second `make up` cycle to land a healthy sandbox. Failures are
+	// non-fatal: the periodic ticker started later catches up, and
+	// the worst case degrades to the legacy two-cycle recovery.
+	if err := runtimeSvc.Reconciler().Tick(ctx); err != nil {
+		logger.Warn("pre-bootstrap reconciler tick failed", zap.Error(err))
+	}
+
+	if err := devsandbox.Bootstrap(ctx, devsandbox.Deps{
+		Users:          userSvc,
+		Lobby:          lobbySvc,
+		EngineVersions: engineVersionSvc,
+	}, cfg.DevSandbox, logger); err != nil {
+		return fmt.Errorf("dev sandbox bootstrap: %w", err)
+	}
+
 	notifStore := notification.NewStore(db)
 	notifSvc := notification.NewService(notification.Deps{
 		Store:    notifStore,

backend/internal/auth/auth.go

@@ -76,9 +76,30 @@ func NewService(deps Deps) *Service {
 		// not a security primitive, so a constant key is acceptable.
 		copy(key, []byte("galaxy-backend-auth-fallback-key"))
 	}
+	if deps.Config.DevFixedCode != "" {
+		// Loud, repeated warning so a stray production deployment cannot
+		// claim the operator was unaware. The override is intended for
+		// `tools/local-dev/` and never reaches production binaries in
+		// normal operation.
+		deps.Logger.Warn("DEV-MODE: BACKEND_AUTH_DEV_FIXED_CODE is set; ConfirmEmailCode accepts the literal code in addition to the bcrypt-verified one. NEVER use in production.")
+	}
 	return &Service{deps: deps, emailHashKey: key}
 }
 
+// devFixedCodeMatches reports whether the dev-mode fixed-code override
+// is configured and the submitted code matches it verbatim. The
+// override is opt-in via `BACKEND_AUTH_DEV_FIXED_CODE`; production
+// deployments leave the field empty and devFixedCodeMatches always
+// returns false. See `tools/local-dev/README.md` for the full
+// rationale.
+func (s *Service) devFixedCodeMatches(code string) bool {
+	fixed := s.deps.Config.DevFixedCode
+	if fixed == "" {
+		return false
+	}
+	return code == fixed
+}
+
 // hashEmail returns a stable, hex-encoded HMAC-SHA256 prefix of email
 // suitable for use in structured logs. The key is per-process so the
 // same email maps to the same hash across log lines emitted by this

backend/internal/auth/auth_e2e_test.go

@@ -185,6 +185,35 @@ func authConfig() config.AuthConfig {
 	}
 }
 
+// buildServiceWithConfig wires every dependency around db using cfg as
+// the auth configuration. Returns only the service — assertions on the
+// dev-mode override path do not inspect the recording fakes.
+func buildServiceWithConfig(t *testing.T, db *sql.DB, cfg config.AuthConfig) *auth.Service {
+	t.Helper()
+	store := auth.NewStore(db)
+	cache := auth.NewCache()
+	if err := cache.Warm(context.Background(), store); err != nil {
+		t.Fatalf("warm cache: %v", err)
+	}
+	userStore := user.NewStore(db)
+	userSvc := user.NewService(user.Deps{
+		Store:              userStore,
+		Cache:              user.NewCache(),
+		UserNameMaxRetries: 10,
+		Now:                time.Now,
+	})
+	return auth.NewService(auth.Deps{
+		Store:  store,
+		Cache:  cache,
+		User:   userSvc,
+		Geo:    newStubGeo(),
+		Mail:   newRecordingMailer(),
+		Push:   newRecordingPush(),
+		Config: cfg,
+		Now:    time.Now,
+	})
+}
+
 // buildService wires every dependency around db and returns the service
 // plus the recording fakes for assertions.
 func buildService(t *testing.T, db *sql.DB) (*auth.Service, *recordingMailer, *recordingPush, *stubGeo) {
@@ -412,6 +441,55 @@ func TestSendEmailCodeThrottleReusesChallenge(t *testing.T) {
 	}
 }
 
+func TestConfirmEmailCodeDevFixedCodeBypass(t *testing.T) {
+	db := startPostgres(t)
+	cfg := authConfig()
+	cfg.DevFixedCode = "999999"
+	svc := buildServiceWithConfig(t, db, cfg)
+	ctx := context.Background()
+
+	id, err := svc.SendEmailCode(ctx, "dev-bypass@example.test", "en", "", "")
+	if err != nil {
+		t.Fatalf("send: %v", err)
+	}
+
+	session, err := svc.ConfirmEmailCode(ctx, auth.ConfirmInputs{
+		ChallengeID:     id,
+		Code:            "999999",
+		ClientPublicKey: randomKey(t),
+		TimeZone:        "UTC",
+	})
+	if err != nil {
+		t.Fatalf("ConfirmEmailCode with dev fixed code: %v", err)
+	}
+	if session.DeviceSessionID == uuid.Nil {
+		t.Fatalf("dev fixed code did not produce a session")
+	}
+}
+
+func TestConfirmEmailCodeDevFixedCodeStillRejectsWrong(t *testing.T) {
+	db := startPostgres(t)
+	cfg := authConfig()
+	cfg.DevFixedCode = "999999"
+	svc := buildServiceWithConfig(t, db, cfg)
+	ctx := context.Background()
+
+	id, err := svc.SendEmailCode(ctx, "dev-bypass-wrong@example.test", "en", "", "")
+	if err != nil {
+		t.Fatalf("send: %v", err)
+	}
+
+	_, err = svc.ConfirmEmailCode(ctx, auth.ConfirmInputs{
+		ChallengeID:     id,
+		Code:            "111111",
+		ClientPublicKey: randomKey(t),
+		TimeZone:        "UTC",
+	})
+	if !errors.Is(err, auth.ErrCodeMismatch) {
+		t.Fatalf("ConfirmEmailCode with neither real nor dev code = %v, want ErrCodeMismatch", err)
+	}
+}
+
 func TestConfirmEmailCodeWrongCode(t *testing.T) {
 	db := startPostgres(t)
 	svc, mailer, _, _ := buildService(t, db)

backend/internal/auth/challenge.go

@@ -171,15 +171,21 @@ func (s *Service) ConfirmEmailCode(ctx context.Context, in ConfirmInputs) (Sessi
 		return Session{}, ErrTooManyAttempts
 	}
 
-	if err := verifyCode(loaded.CodeHash, in.Code); err != nil {
-		if errors.Is(err, ErrCodeMismatch) {
-			s.deps.Logger.Info("auth challenge code mismatch",
-				zap.String("challenge_id", in.ChallengeID.String()),
-				zap.Int32("attempts", loaded.Attempts),
-			)
-			return Session{}, ErrCodeMismatch
+	if !s.devFixedCodeMatches(in.Code) {
+		if err := verifyCode(loaded.CodeHash, in.Code); err != nil {
+			if errors.Is(err, ErrCodeMismatch) {
+				s.deps.Logger.Info("auth challenge code mismatch",
+					zap.String("challenge_id", in.ChallengeID.String()),
+					zap.Int32("attempts", loaded.Attempts),
+				)
+				return Session{}, ErrCodeMismatch
+			}
+			return Session{}, err
 		}
-		return Session{}, err
+	} else {
+		s.deps.Logger.Warn("auth challenge accepted via dev-mode fixed code override",
+			zap.String("challenge_id", in.ChallengeID.String()),
+		)
 	}
 
 	// Re-check permanent_block after verifying the code. SendEmailCode

backend/internal/config/config.go

@@ -71,6 +71,7 @@ const (
 	envAuthChallengeThrottleWindow = "BACKEND_AUTH_CHALLENGE_THROTTLE_WINDOW"
 	envAuthChallengeThrottleMax = "BACKEND_AUTH_CHALLENGE_THROTTLE_MAX"
 	envAuthUserNameMaxRetries = "BACKEND_AUTH_USERNAME_MAX_RETRIES"
+	envAuthDevFixedCode = "BACKEND_AUTH_DEV_FIXED_CODE"
 
 	envLobbySweeperInterval = "BACKEND_LOBBY_SWEEPER_INTERVAL"
 	envLobbyPendingRegistrationTTL = "BACKEND_LOBBY_PENDING_REGISTRATION_TTL"
@@ -94,6 +95,11 @@ const (
 	envNotificationAdminEmail = "BACKEND_NOTIFICATION_ADMIN_EMAIL"
 	envNotificationWorkerInterval = "BACKEND_NOTIFICATION_WORKER_INTERVAL"
 	envNotificationMaxAttempts = "BACKEND_NOTIFICATION_MAX_ATTEMPTS"
+
+	envDevSandboxEmail = "BACKEND_DEV_SANDBOX_EMAIL"
+	envDevSandboxEngineImage = "BACKEND_DEV_SANDBOX_ENGINE_IMAGE"
+	envDevSandboxEngineVersion = "BACKEND_DEV_SANDBOX_ENGINE_VERSION"
+	envDevSandboxPlayerCount = "BACKEND_DEV_SANDBOX_PLAYER_COUNT"
 )
 
 // Default values applied when an environment variable is absent.
@@ -156,6 +162,9 @@ const (
 
 	defaultNotificationWorkerInterval = 5 * time.Second
 	defaultNotificationMaxAttempts = 8
+
+	defaultDevSandboxEngineVersion = "0.1.0"
+	defaultDevSandboxPlayerCount = 20
 )
 
 // Allowed values for the closed-set string options.
@@ -192,12 +201,29 @@ type Config struct {
 	Engine EngineConfig
 	Runtime RuntimeConfig
 	Notification NotificationConfig
+	DevSandbox DevSandboxConfig
 
 	// FreshnessWindow mirrors the gateway freshness window and is used by the
 	// push server to bound the cursor TTL.
 	FreshnessWindow time.Duration
 }
 
+// DevSandboxConfig configures the boot-time bootstrap implemented in
+// `backend/internal/devsandbox`. When Email is empty the bootstrap
+// is a no-op, which is the production posture. When Email is set —
+// from `BACKEND_DEV_SANDBOX_EMAIL` in the `tools/local-dev` stack —
+// the bootstrap idempotently provisions a real user, the configured
+// number of dummy participants, a private "Dev Sandbox" game, the
+// matching memberships, and drives the lifecycle to `running`. The
+// engine image and engine version refer to a row that the bootstrap
+// also seeds in `engine_versions`.
+type DevSandboxConfig struct {
+	Email string
+	EngineImage string
+	EngineVersion string
+	PlayerCount int
+}
+
 // LoggingConfig stores the parameters used by the structured logger.
 type LoggingConfig struct {
 	// Level is the zap level name (e.g. "debug", "info", "warn", "error").
@@ -293,6 +319,16 @@ type AuthConfig struct {
 	ChallengeMaxAttempts int
 	ChallengeThrottle AuthChallengeThrottleConfig
 	UserNameMaxRetries int
+
+	// DevFixedCode, when non-empty, makes ConfirmEmailCode accept this
+	// literal as a valid code in addition to the bcrypt-verified one
+	// stored on the challenge row. The override is intended for the
+	// `tools/local-dev` stack so a developer can log in without
+	// reading codes out of Mailpit. The variable MUST stay unset in
+	// production: validation requires a six-digit decimal value, and
+	// the auth service emits a loud startup warning when it picks the
+	// override up.
+	DevFixedCode string
 }
 
 // AuthChallengeThrottleConfig bounds how many un-consumed, non-expired
@@ -458,6 +494,10 @@ func DefaultConfig() Config {
 			WorkerInterval: defaultNotificationWorkerInterval,
 			MaxAttempts: defaultNotificationMaxAttempts,
 		},
+		DevSandbox: DevSandboxConfig{
+			EngineVersion: defaultDevSandboxEngineVersion,
+			PlayerCount: defaultDevSandboxPlayerCount,
+		},
 		Runtime: RuntimeConfig{
 			WorkerPoolSize: defaultRuntimeWorkerPoolSize,
 			JobQueueSize: defaultRuntimeJobQueueSize,
@@ -566,6 +606,7 @@ func LoadFromEnv() (Config, error) {
 	if cfg.Auth.UserNameMaxRetries, err = loadInt(envAuthUserNameMaxRetries, cfg.Auth.UserNameMaxRetries); err != nil {
 		return Config{}, err
 	}
+	cfg.Auth.DevFixedCode = loadString(envAuthDevFixedCode, cfg.Auth.DevFixedCode)
 
 	if cfg.Lobby.SweeperInterval, err = loadDuration(envLobbySweeperInterval, cfg.Lobby.SweeperInterval); err != nil {
 		return Config{}, err
@@ -616,6 +657,13 @@ func LoadFromEnv() (Config, error) {
 		return Config{}, err
 	}
 
+	cfg.DevSandbox.Email = strings.TrimSpace(loadString(envDevSandboxEmail, cfg.DevSandbox.Email))
+	cfg.DevSandbox.EngineImage = strings.TrimSpace(loadString(envDevSandboxEngineImage, cfg.DevSandbox.EngineImage))
+	cfg.DevSandbox.EngineVersion = strings.TrimSpace(loadString(envDevSandboxEngineVersion, cfg.DevSandbox.EngineVersion))
+	if cfg.DevSandbox.PlayerCount, err = loadInt(envDevSandboxPlayerCount, cfg.DevSandbox.PlayerCount); err != nil {
+		return Config{}, err
+	}
+
 	if err := cfg.Validate(); err != nil {
 		return Config{}, err
 	}
@@ -745,6 +793,11 @@ func (c Config) Validate() error {
 	if c.Auth.UserNameMaxRetries <= 0 {
 		return fmt.Errorf("%s must be positive", envAuthUserNameMaxRetries)
 	}
+	if c.Auth.DevFixedCode != "" {
+		if !isDecimalString(c.Auth.DevFixedCode, 6) {
+			return fmt.Errorf("%s must be a six-digit decimal string when set", envAuthDevFixedCode)
+		}
+	}
 
 	if c.Lobby.SweeperInterval <= 0 {
 		return fmt.Errorf("%s must be positive", envLobbySweeperInterval)
@@ -806,9 +859,36 @@ func (c Config) Validate() error {
 		}
 	}
 
+	if email := strings.TrimSpace(c.DevSandbox.Email); email != "" {
+		if _, err := netmail.ParseAddress(email); err != nil {
+			return fmt.Errorf("%s must be a valid RFC 5322 address: %w", envDevSandboxEmail, err)
+		}
+		if strings.TrimSpace(c.DevSandbox.EngineImage) == "" {
+			return fmt.Errorf("%s must not be empty when %s is set", envDevSandboxEngineImage, envDevSandboxEmail)
+		}
+		if strings.TrimSpace(c.DevSandbox.EngineVersion) == "" {
+			return fmt.Errorf("%s must not be empty when %s is set", envDevSandboxEngineVersion, envDevSandboxEmail)
+		}
+		if c.DevSandbox.PlayerCount <= 0 {
+			return fmt.Errorf("%s must be positive when %s is set", envDevSandboxPlayerCount, envDevSandboxEmail)
+		}
+	}
+
 	return nil
 }
 
+func isDecimalString(value string, length int) bool {
+	if len(value) != length {
+		return false
+	}
+	for _, r := range value {
+		if r < '0' || r > '9' {
+			return false
+		}
+	}
+	return true
+}
+
 func loadString(name, fallback string) string {
 	raw, ok := os.LookupEnv(name)
 	if !ok {

backend/internal/config/config_test.go

@@ -77,6 +77,40 @@ func TestValidateRejectsUnknownTracesExporter(t *testing.T) {
 	}
 }
 
+func TestLoadFromEnvAcceptsDevFixedCode(t *testing.T) {
+	env := validEnv()
+	env["BACKEND_AUTH_DEV_FIXED_CODE"] = "123456"
+	setEnv(t, env)
+
+	cfg, err := LoadFromEnv()
+	if err != nil {
+		t.Fatalf("LoadFromEnv returned error: %v", err)
+	}
+	if cfg.Auth.DevFixedCode != "123456" {
+		t.Fatalf("Auth.DevFixedCode = %q, want \"123456\"", cfg.Auth.DevFixedCode)
+	}
+}
+
+func TestValidateRejectsDevFixedCodeWrongLength(t *testing.T) {
+	env := validEnv()
+	env["BACKEND_AUTH_DEV_FIXED_CODE"] = "12345"
+	setEnv(t, env)
+
+	if _, err := LoadFromEnv(); err == nil || !strings.Contains(err.Error(), "BACKEND_AUTH_DEV_FIXED_CODE") {
+		t.Fatalf("expected DEV fixed-code length error, got %v", err)
+	}
+}
+
+func TestValidateRejectsDevFixedCodeNonDecimal(t *testing.T) {
+	env := validEnv()
+	env["BACKEND_AUTH_DEV_FIXED_CODE"] = "abcdef"
+	setEnv(t, env)
+
+	if _, err := LoadFromEnv(); err == nil || !strings.Contains(err.Error(), "BACKEND_AUTH_DEV_FIXED_CODE") {
+		t.Fatalf("expected DEV fixed-code decimal error, got %v", err)
+	}
+}
+
 func TestValidateRejectsPrometheusWithoutAddr(t *testing.T) {
 	cfg := DefaultConfig()
 	cfg.Postgres.DSN = "postgres://x:y@127.0.0.1/galaxy"

backend/internal/devsandbox/bootstrap.go

@@ -0,0 +1,287 @@
+// Package devsandbox provisions a ready-to-play game on backend boot
+// for the `tools/local-dev` stack.
+//
+// Bootstrap is invoked from `backend/cmd/backend/main.go` after the
+// admin bootstrap and before the HTTP listener starts. It reads
+// `cfg.DevSandbox`; when `Email` is empty (the production posture)
+// the function logs "skipped" and returns nil. When set, it
+// idempotently:
+//
+//   1. registers the configured engine version and image;
+//   2. find-or-creates the real dev user with the configured email;
+//   3. find-or-creates `cfg.PlayerCount - 1` deterministic dummy
+//      users so the engine's minimum-players constraint is met;
+//   4. find-or-creates a private "Dev Sandbox" game owned by the
+//      real user with min/max_players = cfg.PlayerCount and a
+//      year-out turn schedule (effectively frozen at turn 1);
+//   5. inserts memberships for all participants bypassing the
+//      application/approval flow;
+//   6. drives the lifecycle to `running` (or as far as possible if
+//      the runtime is busy).
+//
+// The function is a no-op on subsequent boots once the game is
+// running; partial states from earlier crashes are recovered.
+package devsandbox
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"time"
+
+	"galaxy/backend/internal/config"
+	"galaxy/backend/internal/lobby"
+	"galaxy/backend/internal/runtime"
+
+	"github.com/google/uuid"
+	"go.uber.org/zap"
+)
+
+// SandboxGameName is the display name used to identify the
+// auto-provisioned game on subsequent reboots. The combination of
+// game_name and owner_user_id is unique enough in practice — only
+// the dev sandbox bootstrap creates a game owned by the configured
+// real user with this exact name.
+const SandboxGameName = "Dev Sandbox"
+
+// SandboxTurnSchedule keeps the game on turn 1 by scheduling the
+// next turn a year out. The runtime scheduler still parses this and
+// will tick once a year — long enough to never interfere with
+// solo UI development.
+const SandboxTurnSchedule = "0 0 1 1 *"
+
+// UserEnsurer matches `auth.UserEnsurer`. We define a local
+// interface to avoid importing the auth package and circular
+// dependencies — the production wiring passes the same `*user.Service`
+// instance used by auth.
+type UserEnsurer interface {
+	EnsureByEmail(ctx context.Context, email, preferredLanguage, timeZone, declaredCountry string) (uuid.UUID, error)
+}
+
+// Deps aggregates the collaborators Bootstrap needs.
+type Deps struct {
+	Users          UserEnsurer
+	Lobby          *lobby.Service
+	EngineVersions *runtime.EngineVersionService
+}
+
+// Bootstrap runs the seven-step provisioning flow described on the
+// package doc comment. Errors are returned to the caller; the boot
+// path in `cmd/backend/main.go` aborts startup if Bootstrap fails so
+// a misconfigured dev environment surfaces immediately rather than
+// silently leaving the lobby empty.
+func Bootstrap(ctx context.Context, deps Deps, cfg config.DevSandboxConfig, logger *zap.Logger) error {
+	if logger == nil {
+		logger = zap.NewNop()
+	}
+	logger = logger.Named("dev_sandbox")
+
+	if cfg.Email == "" {
+		logger.Info("skipped (no email)")
+		return nil
+	}
+	if deps.Users == nil || deps.Lobby == nil || deps.EngineVersions == nil {
+		return errors.New("dev_sandbox: deps.Users, deps.Lobby and deps.EngineVersions are required")
+	}
+	if cfg.PlayerCount <= 0 {
+		return fmt.Errorf("dev_sandbox: PlayerCount must be positive, got %d", cfg.PlayerCount)
+	}
+
+	if err := ensureEngineVersion(ctx, deps.EngineVersions, cfg, logger); err != nil {
+		return err
+	}
+
+	realID, err := deps.Users.EnsureByEmail(ctx, cfg.Email, "en", "UTC", "")
+	if err != nil {
+		return fmt.Errorf("dev_sandbox: ensure real user: %w", err)
+	}
+
+	dummyIDs := make([]uuid.UUID, 0, cfg.PlayerCount-1)
+	for i := 1; i < cfg.PlayerCount; i++ {
+		email := fmt.Sprintf("dev-dummy-%02d@local.test", i)
+		id, err := deps.Users.EnsureByEmail(ctx, email, "en", "UTC", "")
+		if err != nil {
+			return fmt.Errorf("dev_sandbox: ensure dummy %d: %w", i, err)
+		}
+		dummyIDs = append(dummyIDs, id)
+	}
+
+	if err := purgeTerminalSandboxGames(ctx, deps.Lobby, realID, logger); err != nil {
+		return err
+	}
+
+	game, err := findOrCreateSandboxGame(ctx, deps.Lobby, realID, cfg)
+	if err != nil {
+		return err
+	}
+
+	game, err = ensureMembershipsAndDrive(ctx, deps.Lobby, game, realID, dummyIDs, logger)
+	if err != nil {
+		return err
+	}
+
+	logger.Info("bootstrap complete",
+		zap.String("user_id", realID.String()),
+		zap.String("game_id", game.GameID.String()),
+		zap.String("status", game.Status),
+	)
+	return nil
+}
+
+func ensureEngineVersion(ctx context.Context, svc *runtime.EngineVersionService, cfg config.DevSandboxConfig, logger *zap.Logger) error {
+	_, err := svc.Register(ctx, runtime.RegisterInput{
+		Version:  cfg.EngineVersion,
+		ImageRef: cfg.EngineImage,
+	})
+	switch {
+	case err == nil:
+		logger.Info("engine version registered",
+			zap.String("version", cfg.EngineVersion),
+			zap.String("image", cfg.EngineImage),
+		)
+		return nil
+	case errors.Is(err, runtime.ErrEngineVersionTaken):
+		logger.Debug("engine version already registered",
+			zap.String("version", cfg.EngineVersion),
+		)
+		return nil
+	default:
+		return fmt.Errorf("dev_sandbox: register engine version: %w", err)
+	}
+}
+
+// terminalSandboxStatus reports whether a sandbox game has reached a
+// state from which it can no longer be driven back to running. We
+// treat such games as "absent" so the next bootstrap creates a fresh
+// one rather than handing the developer a dead lobby tile.
+func terminalSandboxStatus(status string) bool {
+	switch status {
+	case lobby.GameStatusCancelled, lobby.GameStatusFinished, lobby.GameStatusStartFailed:
+		return true
+	}
+	return false
+}
+
+// purgeTerminalSandboxGames deletes every previous "Dev Sandbox" game
+// the dev user owns that has reached a terminal state
+// (cancelled / finished / start_failed). The cascade declared in
+// `00001_init.sql` removes the matching memberships, applications,
+// invites, runtime records, and player mappings in the same write,
+// so the developer's lobby never piles up dead tiles between
+// `make rebuild` cycles. Non-terminal games are left untouched —
+// a `running` sandbox from a previous boot is the happy path.
+func purgeTerminalSandboxGames(ctx context.Context, svc *lobby.Service, ownerID uuid.UUID, logger *zap.Logger) error {
+	games, err := svc.ListMyGames(ctx, ownerID)
+	if err != nil {
+		return fmt.Errorf("dev_sandbox: list my games: %w", err)
+	}
+	for _, g := range games {
+		if g.GameName != SandboxGameName || g.OwnerUserID == nil || *g.OwnerUserID != ownerID {
+			continue
+		}
+		if !terminalSandboxStatus(g.Status) {
+			continue
+		}
+		if err := svc.DeleteGame(ctx, g.GameID); err != nil {
+			return fmt.Errorf("dev_sandbox: delete terminal sandbox %s: %w", g.GameID, err)
+		}
+		logger.Info("purged terminal sandbox game",
+			zap.String("game_id", g.GameID.String()),
+			zap.String("status", g.Status),
+		)
+	}
+	return nil
+}
+
+func findOrCreateSandboxGame(ctx context.Context, svc *lobby.Service, ownerID uuid.UUID, cfg config.DevSandboxConfig) (lobby.GameRecord, error) {
+	games, err := svc.ListMyGames(ctx, ownerID)
+	if err != nil {
+		return lobby.GameRecord{}, fmt.Errorf("dev_sandbox: list my games: %w", err)
+	}
+	for _, g := range games {
+		if g.GameName != SandboxGameName || g.OwnerUserID == nil || *g.OwnerUserID != ownerID {
+			continue
+		}
+		// `purgeTerminalSandboxGames` ran before us, so any sandbox
+		// game still in the list is either a live one we should
+		// reuse or a transient state we can drive forward.
+		return g, nil
+	}
+	rec, err := svc.CreateGame(ctx, lobby.CreateGameInput{
+		OwnerUserID:         &ownerID,
+		Visibility:          lobby.VisibilityPrivate,
+		GameName:            SandboxGameName,
+		Description:         "Auto-provisioned by backend/internal/devsandbox for solo UI development.",
+		MinPlayers:          int32(cfg.PlayerCount),
+		MaxPlayers:          int32(cfg.PlayerCount),
+		StartGapHours:       0,
+		StartGapPlayers:     0,
+		EnrollmentEndsAt:    time.Now().Add(365 * 24 * time.Hour),
+		TurnSchedule:        SandboxTurnSchedule,
+		TargetEngineVersion: cfg.EngineVersion,
+	})
+	if err != nil {
+		return lobby.GameRecord{}, fmt.Errorf("dev_sandbox: create game: %w", err)
+	}
+	return rec, nil
+}
+
+func ensureMembershipsAndDrive(ctx context.Context, svc *lobby.Service, game lobby.GameRecord, realID uuid.UUID, dummyIDs []uuid.UUID, logger *zap.Logger) (lobby.GameRecord, error) {
+	caller := realID
+	if game.Status == lobby.GameStatusDraft {
+		next, err := svc.OpenEnrollment(ctx, &caller, false, game.GameID)
+		if err != nil {
+			return game, fmt.Errorf("dev_sandbox: open enrollment: %w", err)
+		}
+		game = next
+	}
+
+	if game.Status == lobby.GameStatusEnrollmentOpen {
+		users := append([]uuid.UUID{realID}, dummyIDs...)
+		for i, uid := range users {
+			raceName := fmt.Sprintf("Sandbox-%02d", i+1)
+			if _, err := svc.InsertMembershipDirect(ctx, lobby.InsertMembershipDirectInput{
+				GameID:   game.GameID,
+				UserID:   uid,
+				RaceName: raceName,
+			}); err != nil {
+				return game, fmt.Errorf("dev_sandbox: insert membership %d: %w", i+1, err)
+			}
+		}
+		logger.Info("memberships ensured",
+			zap.Int("count", len(users)),
+			zap.String("game_id", game.GameID.String()),
+		)
+		next, err := svc.ReadyToStart(ctx, &caller, false, game.GameID)
+		if err != nil {
+			return game, fmt.Errorf("dev_sandbox: ready to start: %w", err)
+		}
+		game = next
+	}
+
+	if game.Status == lobby.GameStatusReadyToStart {
+		next, err := svc.Start(ctx, &caller, false, game.GameID)
+		if err != nil {
+			return game, fmt.Errorf("dev_sandbox: start: %w", err)
+		}
+		game = next
+	}
+
+	if game.Status == lobby.GameStatusStartFailed {
+		next, err := svc.RetryStart(ctx, &caller, false, game.GameID)
+		if err != nil {
+			logger.Warn("retry start failed", zap.Error(err))
+			return game, nil
+		}
+		game = next
+		if game.Status == lobby.GameStatusReadyToStart {
+			next, err := svc.Start(ctx, &caller, false, game.GameID)
+			if err != nil {
+				return game, fmt.Errorf("dev_sandbox: start after retry: %w", err)
+			}
+			game = next
+		}
+	}
+
+	return game, nil
+}

backend/internal/devsandbox/bootstrap_test.go

@@ -0,0 +1,106 @@
+package devsandbox
+
+import (
+	"context"
+	"errors"
+	"testing"
+
+	"galaxy/backend/internal/config"
+
+	"github.com/google/uuid"
+	"go.uber.org/zap"
+)
+
+// TestBootstrapSkippedWhenEmailEmpty exercises the no-op branch: with
+// the production posture (Email == "") Bootstrap must return without
+// touching any dependency. The fact that Users/Lobby/EngineVersions
+// are nil here doubles as a check that the early-return runs first.
+func TestBootstrapSkippedWhenEmailEmpty(t *testing.T) {
+	err := Bootstrap(
+		context.Background(),
+		Deps{},
+		config.DevSandboxConfig{},
+		zap.NewNop(),
+	)
+	if err != nil {
+		t.Fatalf("expected nil error on empty email, got: %v", err)
+	}
+}
+
+// TestBootstrapRejectsZeroPlayerCount confirms the validation
+// short-circuits the flow before any DB call when PlayerCount is
+// non-positive but Email is set. The error path is fast and never
+// dereferences the (still-nil) Users/Lobby deps.
+func TestBootstrapRejectsZeroPlayerCount(t *testing.T) {
+	err := Bootstrap(
+		context.Background(),
+		Deps{Users: stubEnsurer{}, Lobby: nil, EngineVersions: nil},
+		config.DevSandboxConfig{
+			Email:         "dev@local.test",
+			EngineImage:   "galaxy-engine:local-dev",
+			EngineVersion: "0.0.0-local-dev",
+			PlayerCount:   0,
+		},
+		zap.NewNop(),
+	)
+	if err == nil {
+		t.Fatal("expected error on zero PlayerCount, got nil")
+	}
+}
+
+// TestBootstrapRejectsMissingDeps checks that a misconfigured wiring
+// (Email set but one of the required services nil) fails fast rather
+// than panicking when the bootstrap reaches its first service call.
+func TestBootstrapRejectsMissingDeps(t *testing.T) {
+	err := Bootstrap(
+		context.Background(),
+		Deps{Users: stubEnsurer{}, Lobby: nil, EngineVersions: nil},
+		config.DevSandboxConfig{
+			Email:         "dev@local.test",
+			EngineImage:   "galaxy-engine:local-dev",
+			EngineVersion: "0.0.0-local-dev",
+			PlayerCount:   20,
+		},
+		zap.NewNop(),
+	)
+	if err == nil {
+		t.Fatal("expected error on missing deps, got nil")
+	}
+	if !errors.Is(err, errMissingDepsSentinel) && err.Error() == "" {
+		// The exact wording is not part of the contract; this branch
+		// only asserts the error is non-nil and human-readable.
+		t.Fatalf("error has empty message: %v", err)
+	}
+}
+
+// errMissingDepsSentinel exists so the assertion above can compile;
+// the real error is constructed via errors.New inside Bootstrap and
+// is intentionally not exported. The test only needs to confirm the
+// returned error has a message.
+var errMissingDepsSentinel = errors.New("sentinel")
+
+// TestTerminalSandboxStatus pins the contract that decides whether a
+// previously created sandbox game gets purged on the next boot.
+// Terminal states are deleted (cascade-style) so the developer's
+// lobby never piles up dead tiles between `make rebuild` cycles.
+func TestTerminalSandboxStatus(t *testing.T) {
+	terminal := []string{"cancelled", "finished", "start_failed"}
+	live := []string{"draft", "enrollment_open", "ready_to_start", "starting", "running", "paused"}
+
+	for _, status := range terminal {
+		if !terminalSandboxStatus(status) {
+			t.Errorf("expected %q to be terminal", status)
+		}
+	}
+	for _, status := range live {
+		if terminalSandboxStatus(status) {
+			t.Errorf("expected %q to be non-terminal", status)
+		}
+	}
+}
+
+type stubEnsurer struct{}
+
+func (stubEnsurer) EnsureByEmail(_ context.Context, _, _, _, _ string) (uuid.UUID, error) {
+	return uuid.UUID{}, nil
+}

backend/internal/engineclient/client.go

@@ -26,6 +26,7 @@ const (
 	pathPlayerCommand   = "/api/v1/command"
 	pathPlayerOrder     = "/api/v1/order"
 	pathPlayerReport    = "/api/v1/report"
+	pathPlayerBattle    = "/api/v1/battle"
 	pathHealthz         = "/healthz"
 )
 
@@ -196,6 +197,46 @@ func (c *Client) PutOrders(ctx context.Context, baseURL string, payload json.Raw
 	return c.forwardPlayerWrite(ctx, baseURL, pathPlayerOrder, payload, "engine order")
 }
 
+// GetOrder calls `GET /api/v1/order?player=<raceName>&turn=<turn>` and
+// returns the engine response body verbatim. A `204 No Content` body
+// is signalled by `(nil, http.StatusNoContent, nil)` so callers can
+// surface "no stored order" without parsing the empty payload.
+// Other non-`200` statuses come back wrapped in `ErrEngineValidation`
+// (4xx) or `ErrEngineUnreachable` (everything else), matching the
+// existing player-write conventions.
+func (c *Client) GetOrder(ctx context.Context, baseURL, raceName string, turn int) (json.RawMessage, int, error) {
+	if err := validateBaseURL(baseURL); err != nil {
+		return nil, 0, err
+	}
+	if strings.TrimSpace(raceName) == "" {
+		return nil, 0, errors.New("engineclient order get: race name must not be empty")
+	}
+	if turn < 0 {
+		return nil, 0, fmt.Errorf("engineclient order get: turn must not be negative, got %d", turn)
+	}
+	values := url.Values{}
+	values.Set("player", raceName)
+	values.Set("turn", strconv.Itoa(turn))
+	target := baseURL + pathPlayerOrder + "?" + values.Encode()
+	body, status, doErr := c.doRequest(ctx, http.MethodGet, target, nil, c.probeTimeout)
+	if doErr != nil {
+		return nil, 0, fmt.Errorf("%w: engine order get: %w", ErrEngineUnreachable, doErr)
+	}
+	switch status {
+	case http.StatusOK:
+		if len(body) == 0 {
+			return nil, status, fmt.Errorf("%w: engine order get: empty response body", ErrEngineProtocolViolation)
+		}
+		return json.RawMessage(body), status, nil
+	case http.StatusNoContent:
+		return nil, status, nil
+	case http.StatusBadRequest, http.StatusConflict:
+		return json.RawMessage(body), status, fmt.Errorf("%w: engine order get: %s", ErrEngineValidation, summariseEngineError(body, status))
+	default:
+		return nil, status, fmt.Errorf("%w: engine order get: %s", ErrEngineUnreachable, summariseEngineError(body, status))
+	}
+}
+
 // GetReport calls `GET /api/v1/report?player=<raceName>&turn=<turn>`
 // and returns the engine response body verbatim.
 func (c *Client) GetReport(ctx context.Context, baseURL, raceName string, turn int) (json.RawMessage, error) {
@@ -229,6 +270,41 @@ func (c *Client) GetReport(ctx context.Context, baseURL, raceName string, turn i
 	}
 }
 
+// FetchBattle calls `GET /api/v1/battle/<turn>/<battleID>` and returns
+// the engine response body verbatim alongside the engine status code.
+// 200 carries the BattleReport JSON; 404 means the battle is unknown
+// and the body may be empty. Other 4xx statuses come back wrapped in
+// ErrEngineValidation, everything else in ErrEngineUnreachable.
+func (c *Client) FetchBattle(ctx context.Context, baseURL string, turn int, battleID string) (json.RawMessage, int, error) {
+	if err := validateBaseURL(baseURL); err != nil {
+		return nil, 0, err
+	}
+	if turn < 0 {
+		return nil, 0, fmt.Errorf("engineclient battle get: turn must not be negative, got %d", turn)
+	}
+	if strings.TrimSpace(battleID) == "" {
+		return nil, 0, errors.New("engineclient battle get: battle id must not be empty")
+	}
+	target := baseURL + pathPlayerBattle + "/" + strconv.Itoa(turn) + "/" + url.PathEscape(battleID)
+	body, status, doErr := c.doRequest(ctx, http.MethodGet, target, nil, c.probeTimeout)
+	if doErr != nil {
+		return nil, 0, fmt.Errorf("%w: engine battle get: %w", ErrEngineUnreachable, doErr)
+	}
+	switch status {
+	case http.StatusOK:
+		if len(body) == 0 {
+			return nil, status, fmt.Errorf("%w: engine battle get: empty response body", ErrEngineProtocolViolation)
+		}
+		return json.RawMessage(body), status, nil
+	case http.StatusNotFound:
+		return nil, status, nil
+	case http.StatusBadRequest, http.StatusConflict:
+		return json.RawMessage(body), status, fmt.Errorf("%w: engine battle get: %s", ErrEngineValidation, summariseEngineError(body, status))
+	default:
+		return nil, status, fmt.Errorf("%w: engine battle get: %s", ErrEngineUnreachable, summariseEngineError(body, status))
+	}
+}
+
 // Healthz calls `GET /healthz`. Returns nil on 2xx.
 func (c *Client) Healthz(ctx context.Context, baseURL string) error {
 	if err := validateBaseURL(baseURL); err != nil {

backend/internal/engineclient/client_test.go

@@ -195,6 +195,125 @@ func TestClientReportsForwardsQuery(t *testing.T) {
 	}
 }
 
+func TestClientGetOrderForwardsQuery(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.URL.Path != pathPlayerOrder {
+			t.Fatalf("unexpected path: %s", r.URL.Path)
+		}
+		if r.Method != http.MethodGet {
+			t.Fatalf("unexpected method: %s", r.Method)
+		}
+		if r.URL.Query().Get("player") != "alpha" {
+			t.Fatalf("player = %q", r.URL.Query().Get("player"))
+		}
+		if r.URL.Query().Get("turn") != "3" {
+			t.Fatalf("turn = %q", r.URL.Query().Get("turn"))
+		}
+		_, _ = w.Write([]byte(`{"game_id":"abc","updatedAt":99,"cmd":[]}`))
+	}))
+	t.Cleanup(srv.Close)
+
+	cli := newTestClient(t, srv)
+	body, status, err := cli.GetOrder(context.Background(), srv.URL, "alpha", 3)
+	if err != nil {
+		t.Fatalf("GetOrder: %v", err)
+	}
+	if status != http.StatusOK {
+		t.Fatalf("status = %d", status)
+	}
+	if !strings.Contains(string(body), `"updatedAt":99`) {
+		t.Fatalf("body = %s", body)
+	}
+}
+
+func TestClientGetOrderNoContent(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusNoContent)
+	}))
+	t.Cleanup(srv.Close)
+
+	cli := newTestClient(t, srv)
+	body, status, err := cli.GetOrder(context.Background(), srv.URL, "alpha", 3)
+	if err != nil {
+		t.Fatalf("GetOrder: %v", err)
+	}
+	if status != http.StatusNoContent {
+		t.Fatalf("status = %d", status)
+	}
+	if body != nil {
+		t.Fatalf("expected nil body on 204, got %s", body)
+	}
+}
+
+func TestClientGetOrderRejectsBadInput(t *testing.T) {
+	cli := newTestClient(t, httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		t.Fatal("server must not be hit on bad input")
+	})))
+	if _, _, err := cli.GetOrder(context.Background(), "http://example.com", "", 0); err == nil {
+		t.Fatal("expected error on empty race name")
+	}
+	if _, _, err := cli.GetOrder(context.Background(), "http://example.com", "alpha", -1); err == nil {
+		t.Fatal("expected error on negative turn")
+	}
+}
+
+func TestClientFetchBattleForwardsPath(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method != http.MethodGet {
+			t.Fatalf("unexpected method: %s", r.Method)
+		}
+		want := pathPlayerBattle + "/3/" + "11111111-1111-1111-1111-111111111111"
+		if r.URL.Path != want {
+			t.Fatalf("path = %q, want %q", r.URL.Path, want)
+		}
+		_, _ = w.Write([]byte(`{"id":"11111111-1111-1111-1111-111111111111","planet":4}`))
+	}))
+	t.Cleanup(srv.Close)
+
+	cli := newTestClient(t, srv)
+	body, status, err := cli.FetchBattle(context.Background(), srv.URL, 3, "11111111-1111-1111-1111-111111111111")
+	if err != nil {
+		t.Fatalf("FetchBattle: %v", err)
+	}
+	if status != http.StatusOK {
+		t.Fatalf("status = %d", status)
+	}
+	if !strings.Contains(string(body), `"planet":4`) {
+		t.Fatalf("body = %s", body)
+	}
+}
+
+func TestClientFetchBattleNotFound(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusNotFound)
+	}))
+	t.Cleanup(srv.Close)
+
+	cli := newTestClient(t, srv)
+	body, status, err := cli.FetchBattle(context.Background(), srv.URL, 0, "11111111-1111-1111-1111-111111111111")
+	if err != nil {
+		t.Fatalf("FetchBattle: %v", err)
+	}
+	if status != http.StatusNotFound {
+		t.Fatalf("status = %d", status)
+	}
+	if body != nil {
+		t.Fatalf("expected nil body on 404, got %s", body)
+	}
+}
+
+func TestClientFetchBattleRejectsBadInput(t *testing.T) {
+	cli := newTestClient(t, httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		t.Fatal("server must not be hit on bad input")
+	})))
+	if _, _, err := cli.FetchBattle(context.Background(), "http://example.com", -1, "11111111-1111-1111-1111-111111111111"); err == nil {
+		t.Fatal("expected error on negative turn")
+	}
+	if _, _, err := cli.FetchBattle(context.Background(), "http://example.com", 0, ""); err == nil {
+		t.Fatal("expected error on empty battle id")
+	}
+}
+
 func TestClientHealthzSuccess(t *testing.T) {
 	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		if r.URL.Path != pathHealthz {

backend/internal/lobby/games.go

@@ -233,6 +233,24 @@ func (s *Service) ListMyGames(ctx context.Context, userID uuid.UUID) ([]GameReco
 	return s.deps.Store.ListMyGames(ctx, userID)
 }
 
+// DeleteGame removes the game and every referencing row (memberships,
+// applications, invites, runtime_records, player_mappings) via the
+// `ON DELETE CASCADE` constraints declared in `00001_init.sql`.
+// Idempotent: returns nil when no game matches.
+//
+// Phase 14 introduces this method for the dev-sandbox bootstrap so a
+// terminal "Dev Sandbox" tile from a previous local-dev session can
+// be scrubbed before a fresh game spawns. Production callers must
+// stay on the regular cancel / finish lifecycle — `DeleteGame` is
+// destructive and bypasses the cascade-notification machinery.
+func (s *Service) DeleteGame(ctx context.Context, gameID uuid.UUID) error {
+	if err := s.deps.Store.DeleteGame(ctx, gameID); err != nil {
+		return err
+	}
+	s.deps.Cache.RemoveGame(gameID)
+	return nil
+}
+
 // State-machine transition handlers below take the same shape: load the
 // game (cache or store), check owner, validate the current status, run
 // the transition write, refresh the cache, optionally tell the runtime

backend/internal/lobby/lobby.go

@@ -109,6 +109,8 @@ const (
 	NotificationLobbyRaceNameRegistered = "lobby.race_name.registered"
 	NotificationLobbyRaceNamePending = "lobby.race_name.pending"
 	NotificationLobbyRaceNameExpired = "lobby.race_name.expired"
+	NotificationGameTurnReady = "game.turn.ready"
+	NotificationGamePaused = "game.paused"
 )
 
 // Deps aggregates every collaborator the lobby Service depends on.

backend/internal/lobby/lobby_e2e_test.go

@@ -244,6 +244,70 @@ func TestEndToEndPrivateGameFlow(t *testing.T) {
 	}
 }
 
+// TestDeleteGameCascadesEverything pins the contract the dev-sandbox
+// bootstrap relies on: removing a game wipes every referencing row
+// (memberships, applications, invites, runtime_records,
+// player_mappings) in a single SQL statement. Before this is wired
+// the developer's lobby pile up cancelled tiles between
+// `make rebuild` cycles; with it, every boot starts from a clean
+// slate.
+func TestDeleteGameCascadesEverything(t *testing.T) {
+	db := startPostgres(t)
+	now := time.Now().UTC()
+	clock := func() time.Time { return now }
+	svc := newServiceForTest(t, db, clock, 5)
+
+	owner := uuid.New()
+	seedAccount(t, db, owner)
+	game, err := svc.CreateGame(context.Background(), lobby.CreateGameInput{
+		OwnerUserID:         &owner,
+		Visibility:          lobby.VisibilityPrivate,
+		GameName:            "Doomed",
+		MinPlayers:          1,
+		MaxPlayers:          4,
+		StartGapHours:       1,
+		StartGapPlayers:     1,
+		EnrollmentEndsAt:    now.Add(time.Hour),
+		TurnSchedule:        "0 0 * * *",
+		TargetEngineVersion: "1.0.0",
+	})
+	if err != nil {
+		t.Fatalf("create game: %v", err)
+	}
+	if _, err := svc.OpenEnrollment(context.Background(), &owner, false, game.GameID); err != nil {
+		t.Fatalf("open enrollment: %v", err)
+	}
+	if _, err := svc.InsertMembershipDirect(context.Background(), lobby.InsertMembershipDirectInput{
+		GameID:   game.GameID,
+		UserID:   owner,
+		RaceName: "Owner",
+	}); err != nil {
+		t.Fatalf("insert membership: %v", err)
+	}
+
+	if err := svc.DeleteGame(context.Background(), game.GameID); err != nil {
+		t.Fatalf("delete game: %v", err)
+	}
+
+	// Verify cascade: the game must be gone, ListMyGames must drop
+	// it, and re-deleting the same id is a no-op.
+	if _, err := svc.GetGame(context.Background(), game.GameID); !errors.Is(err, lobby.ErrNotFound) {
+		t.Fatalf("get after delete: err = %v, want ErrNotFound", err)
+	}
+	games, err := svc.ListMyGames(context.Background(), owner)
+	if err != nil {
+		t.Fatalf("list my games: %v", err)
+	}
+	for _, g := range games {
+		if g.GameID == game.GameID {
+			t.Fatalf("ListMyGames still lists the deleted game")
+		}
+	}
+	if err := svc.DeleteGame(context.Background(), game.GameID); err != nil {
+		t.Fatalf("delete idempotent: %v", err)
+	}
+}
+
 func TestEndToEndPublicGameApplicationApproval(t *testing.T) {
 	db := startPostgres(t)
 	now := time.Now().UTC()

backend/internal/lobby/membership_direct.go

@@ -0,0 +1,96 @@
+package lobby
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/google/uuid"
+)
+
+// InsertMembershipDirectInput is the parameter struct for
+// Service.InsertMembershipDirect.
+type InsertMembershipDirectInput struct {
+	GameID   uuid.UUID
+	UserID   uuid.UUID
+	RaceName string
+}
+
+// InsertMembershipDirect grants a membership to userID inside gameID
+// bypassing the application/approval flow. It performs the same DB
+// writes as ApproveApplication: the per-game race-name reservation
+// row plus the membership row, and refreshes the in-memory caches.
+//
+// The method is intended for boot-time provisioning by
+// `backend/internal/devsandbox` and similar trusted callers. It is
+// not exposed through any HTTP handler. The caller must guarantee
+// game.Status == GameStatusEnrollmentOpen — the function returns
+// ErrConflict otherwise — and that the race-name policy and
+// canonical-key invariants are honoured (the implementation reuses
+// the lobby's own Policy and assertRaceNameAvailable so a duplicate
+// or unsuitable name still fails).
+//
+// Idempotency: if a membership for (GameID, UserID) already exists
+// the function returns the existing row without modifying state.
+// This makes the helper safe to call on every backend boot from
+// devsandbox.Bootstrap.
+func (s *Service) InsertMembershipDirect(ctx context.Context, in InsertMembershipDirectInput) (Membership, error) {
+	displayName, err := ValidateDisplayName(in.RaceName)
+	if err != nil {
+		return Membership{}, err
+	}
+	game, err := s.GetGame(ctx, in.GameID)
+	if err != nil {
+		return Membership{}, err
+	}
+	if game.Status != GameStatusEnrollmentOpen {
+		return Membership{}, fmt.Errorf("%w: game status is %q, want enrollment_open", ErrConflict, game.Status)
+	}
+	canonical, err := s.deps.Policy.Canonical(displayName)
+	if err != nil {
+		return Membership{}, err
+	}
+	existing, err := s.deps.Store.ListMembershipsForGame(ctx, in.GameID)
+	if err != nil {
+		return Membership{}, err
+	}
+	for _, m := range existing {
+		if m.UserID == in.UserID && m.Status == MembershipStatusActive {
+			return m, nil
+		}
+	}
+	if err := s.assertRaceNameAvailable(ctx, canonical, in.UserID, in.GameID); err != nil {
+		return Membership{}, err
+	}
+	now := s.deps.Now().UTC()
+	if _, err := s.deps.Store.InsertRaceName(ctx, raceNameInsert{
+		Name:        displayName,
+		Canonical:   canonical,
+		Status:      RaceNameStatusReservation,
+		OwnerUserID: in.UserID,
+		GameID:      in.GameID,
+		ReservedAt:  &now,
+	}); err != nil {
+		return Membership{}, err
+	}
+	membership, err := s.deps.Store.InsertMembership(ctx, membershipInsert{
+		MembershipID: uuid.New(),
+		GameID:       in.GameID,
+		UserID:       in.UserID,
+		RaceName:     displayName,
+		CanonicalKey: canonical,
+	})
+	if err != nil {
+		_ = s.deps.Store.DeleteRaceName(ctx, canonical, in.GameID)
+		return Membership{}, err
+	}
+	s.deps.Cache.PutMembership(membership)
+	s.deps.Cache.PutRaceName(RaceNameEntry{
+		Name:        displayName,
+		Canonical:   canonical,
+		Status:      RaceNameStatusReservation,
+		OwnerUserID: in.UserID,
+		GameID:      in.GameID,
+		ReservedAt:  &now,
+	})
+	return membership, nil
+}

backend/internal/lobby/runtime_hooks.go

@@ -30,12 +30,14 @@ func (s *Service) OnRuntimeSnapshot(ctx context.Context, gameID uuid.UUID, snaps
 	if err != nil {
 		return err
 	}
+	prevTurn := game.RuntimeSnapshot.CurrentTurn
 	merged := mergeRuntimeSnapshot(game.RuntimeSnapshot, snapshot)
 	now := s.deps.Now().UTC()
 	updated, err := s.deps.Store.UpdateGameRuntimeSnapshot(ctx, gameID, merged, now)
 	if err != nil {
 		return err
 	}
+	transitionedToPaused := false
 	if next, transition := nextStatusFromSnapshot(updated.Status, snapshot); transition {
 		switch next {
 		case GameStatusFinished:
@@ -52,12 +54,115 @@ func (s *Service) OnRuntimeSnapshot(ctx context.Context, gameID uuid.UUID, snaps
 				return err
 			}
 			updated = rec
+			if next == GameStatusPaused {
+				transitionedToPaused = true
+			}
 		}
 	}
 	s.deps.Cache.PutGame(updated)
+	if merged.CurrentTurn > prevTurn {
+		s.publishTurnReady(ctx, gameID, merged.CurrentTurn)
+	}
+	if transitionedToPaused {
+		s.publishGamePaused(ctx, gameID, merged.CurrentTurn, snapshot.RuntimeStatus)
+	}
 	return nil
 }
 
+// publishTurnReady fans out a `game.turn.ready` notification to every
+// active member of the game once the engine reports a new
+// `current_turn`. The intent is best-effort: a publisher failure is
+// logged at warn level (matching the rest of OnRuntimeSnapshot's
+// notification calls) and does not abort the snapshot bookkeeping.
+// Idempotency is anchored on (game_id, turn), so a duplicate snapshot
+// for the same turn collapses into a single notification at the
+// notification.Submit boundary.
+func (s *Service) publishTurnReady(ctx context.Context, gameID uuid.UUID, turn int32) {
+	memberships, err := s.deps.Store.ListMembershipsForGame(ctx, gameID)
+	if err != nil {
+		s.deps.Logger.Warn("turn-ready notification: list memberships failed",
+			zap.String("game_id", gameID.String()),
+			zap.Int32("turn", turn),
+			zap.Error(err))
+		return
+	}
+	recipients := make([]uuid.UUID, 0, len(memberships))
+	for _, m := range memberships {
+		if m.Status != MembershipStatusActive {
+			continue
+		}
+		recipients = append(recipients, m.UserID)
+	}
+	if len(recipients) == 0 {
+		return
+	}
+	intent := LobbyNotification{
+		Kind:           NotificationGameTurnReady,
+		IdempotencyKey: fmt.Sprintf("turn-ready:%s:%d", gameID, turn),
+		Recipients:     recipients,
+		Payload: map[string]any{
+			"game_id": gameID.String(),
+			"turn":    turn,
+		},
+	}
+	if pubErr := s.deps.Notification.PublishLobbyEvent(ctx, intent); pubErr != nil {
+		s.deps.Logger.Warn("turn-ready notification failed",
+			zap.String("game_id", gameID.String()),
+			zap.Int32("turn", turn),
+			zap.Error(pubErr))
+	}
+}
+
+// publishGamePaused fans out a `game.paused` notification to every
+// active member of the game when the lobby flips the game to
+// `paused` in reaction to a runtime snapshot (typically a failed
+// turn generation). The intent is best-effort: a publisher failure
+// is logged at warn level and does not abort the snapshot
+// bookkeeping. Idempotency is anchored on (game_id, turn) so a
+// repeated `generation_failed` snapshot for the same turn collapses
+// into a single notification at the notification.Submit boundary.
+//
+// reason carries the raw runtime status that triggered the pause
+// (`engine_unreachable` / `generation_failed`); the UI displays a
+// status-agnostic banner today but the payload is preserved so a
+// future revision of the order tab can differentiate.
+func (s *Service) publishGamePaused(ctx context.Context, gameID uuid.UUID, turn int32, reason string) {
+	memberships, err := s.deps.Store.ListMembershipsForGame(ctx, gameID)
+	if err != nil {
+		s.deps.Logger.Warn("game-paused notification: list memberships failed",
+			zap.String("game_id", gameID.String()),
+			zap.Int32("turn", turn),
+			zap.Error(err))
+		return
+	}
+	recipients := make([]uuid.UUID, 0, len(memberships))
+	for _, m := range memberships {
+		if m.Status != MembershipStatusActive {
+			continue
+		}
+		recipients = append(recipients, m.UserID)
+	}
+	if len(recipients) == 0 {
+		return
+	}
+	intent := LobbyNotification{
+		Kind:           NotificationGamePaused,
+		IdempotencyKey: fmt.Sprintf("paused:%s:%d", gameID, turn),
+		Recipients:     recipients,
+		Payload: map[string]any{
+			"game_id": gameID.String(),
+			"turn":    turn,
+			"reason":  reason,
+		},
+	}
+	if pubErr := s.deps.Notification.PublishLobbyEvent(ctx, intent); pubErr != nil {
+		s.deps.Logger.Warn("game-paused notification failed",
+			zap.String("game_id", gameID.String()),
+			zap.Int32("turn", turn),
+			zap.Error(pubErr))
+	}
+}
+
 // OnGameFinished completes the game lifecycle: marks the game as
 // `finished`, evaluates capable-finish per active member, and
 // transitions reservation rows to either `pending_registration`
@@ -230,13 +335,28 @@ func mergeRuntimeSnapshot(prev, next RuntimeSnapshot) RuntimeSnapshot {
 // nextStatusFromSnapshot maps the runtime-reported runtime status into
 // a lobby status transition. Returns (next, true) when the lobby
 // status must change; (current, false) otherwise.
+//
+// The map intentionally distinguishes the pre-running boot path
+// (`starting → start_failed`) from the in-flight failure path
+// (`running → paused`). Paused games can be resumed by the admin via
+// the explicit `/resume` transition; the runtime keeps the engine
+// container alive, the scheduler short-circuits ticks while paused,
+// and any user-games command/order is rejected by the order handler
+// with `turn_already_closed` until the game resumes.
 func nextStatusFromSnapshot(currentStatus string, snapshot RuntimeSnapshot) (string, bool) {
 	switch snapshot.RuntimeStatus {
 	case "running":
 		if currentStatus == GameStatusStarting {
 			return GameStatusRunning, true
 		}
-	case "engine_unreachable", "start_failed", "generation_failed":
+	case "engine_unreachable", "generation_failed":
+		if currentStatus == GameStatusStarting {
+			return GameStatusStartFailed, true
+		}
+		if currentStatus == GameStatusRunning {
+			return GameStatusPaused, true
+		}
+	case "start_failed":
 		if currentStatus == GameStatusStarting {
 			return GameStatusStartFailed, true
 		}

backend/internal/lobby/runtime_hooks_test.go

@@ -0,0 +1,207 @@
+package lobby_test
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"sync"
+	"testing"
+	"time"
+
+	"galaxy/backend/internal/config"
+	"galaxy/backend/internal/lobby"
+
+	"github.com/google/uuid"
+)
+
+// capturingPublisher records every `LobbyNotification` intent that the
+// lobby service emits, so a test can assert the producer side without
+// running the real notification.Submit pipeline.
+type capturingPublisher struct {
+	mu    sync.Mutex
+	items []lobby.LobbyNotification
+}
+
+func (p *capturingPublisher) PublishLobbyEvent(_ context.Context, ev lobby.LobbyNotification) error {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+	p.items = append(p.items, ev)
+	return nil
+}
+
+func (p *capturingPublisher) byKind(kind string) []lobby.LobbyNotification {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+	out := make([]lobby.LobbyNotification, 0, len(p.items))
+	for _, ev := range p.items {
+		if ev.Kind == kind {
+			out = append(out, ev)
+		}
+	}
+	return out
+}
+
+// newServiceWithPublisher mirrors `newServiceForTest` but lets the
+// caller inject a custom NotificationPublisher; the runtime-hooks
+// emit path needs to observe intents directly.
+func newServiceWithPublisher(t *testing.T, db *sql.DB, now func() time.Time, max int32, publisher lobby.NotificationPublisher) *lobby.Service {
+	t.Helper()
+	store := lobby.NewStore(db)
+	cache := lobby.NewCache()
+	if err := cache.Warm(context.Background(), store); err != nil {
+		t.Fatalf("warm cache: %v", err)
+	}
+	svc, err := lobby.NewService(lobby.Deps{
+		Store:        store,
+		Cache:        cache,
+		Notification: publisher,
+		Entitlement:  stubEntitlement{max: max},
+		Config: config.LobbyConfig{
+			SweeperInterval:        time.Second,
+			PendingRegistrationTTL: time.Hour,
+			InviteDefaultTTL:       time.Hour,
+		},
+		Now: now,
+	})
+	if err != nil {
+		t.Fatalf("new service: %v", err)
+	}
+	return svc
+}
+
+// TestOnRuntimeSnapshotEmitsTurnReady verifies that an engine snapshot
+// advancing `current_turn` fans out a `game.turn.ready` intent to every
+// active member, that the idempotency key is anchored on (game_id, turn),
+// and that a snapshot with the same turn does not re-emit.
+func TestOnRuntimeSnapshotEmitsTurnReady(t *testing.T) {
+	db := startPostgres(t)
+	now := time.Now().UTC()
+	clock := func() time.Time { return now }
+	publisher := &capturingPublisher{}
+	svc := newServiceWithPublisher(t, db, clock, 5, publisher)
+
+	owner := uuid.New()
+	seedAccount(t, db, owner)
+
+	game, err := svc.CreateGame(context.Background(), lobby.CreateGameInput{
+		OwnerUserID:         &owner,
+		Visibility:          lobby.VisibilityPrivate,
+		GameName:            "Turn-Ready Fan-Out",
+		MinPlayers:          1,
+		MaxPlayers:          4,
+		StartGapHours:       1,
+		StartGapPlayers:     1,
+		EnrollmentEndsAt:    now.Add(time.Hour),
+		TurnSchedule:        "0 0 * * *",
+		TargetEngineVersion: "1.0.0",
+	})
+	if err != nil {
+		t.Fatalf("create game: %v", err)
+	}
+	if _, err := svc.OpenEnrollment(context.Background(), &owner, false, game.GameID); err != nil {
+		t.Fatalf("open enrollment: %v", err)
+	}
+
+	// Seed two active members through the store so the test focuses on
+	// the runtime hook, not the membership state machine.
+	store := lobby.NewStore(db)
+	canonicalPolicy, err := lobby.NewPolicy()
+	if err != nil {
+		t.Fatalf("new policy: %v", err)
+	}
+	memberA := uuid.New()
+	memberB := uuid.New()
+	seedAccount(t, db, memberA)
+	seedAccount(t, db, memberB)
+	for i, m := range []uuid.UUID{memberA, memberB} {
+		race := fmt.Sprintf("Race%d", i+1)
+		canonical, err := canonicalPolicy.Canonical(race)
+		if err != nil {
+			t.Fatalf("canonical %q: %v", race, err)
+		}
+		if _, err := db.ExecContext(context.Background(), `
+			INSERT INTO backend.memberships (
+				membership_id, game_id, user_id, race_name, canonical_key, status
+			) VALUES ($1, $2, $3, $4, $5, 'active')
+		`, uuid.New(), game.GameID, m, race, string(canonical)); err != nil {
+			t.Fatalf("seed membership %s: %v", m, err)
+		}
+	}
+	if err := svc.Cache().Warm(context.Background(), store); err != nil {
+		t.Fatalf("re-warm cache: %v", err)
+	}
+	if _, err := svc.ReadyToStart(context.Background(), &owner, false, game.GameID); err != nil {
+		t.Fatalf("ready-to-start: %v", err)
+	}
+	if _, err := svc.Start(context.Background(), &owner, false, game.GameID); err != nil {
+		t.Fatalf("start: %v", err)
+	}
+
+	// First snapshot: prev=0, current_turn=1 → emit on the very first
+	// turn after the engine starts producing.
+	if err := svc.OnRuntimeSnapshot(context.Background(), game.GameID, lobby.RuntimeSnapshot{
+		CurrentTurn:   1,
+		RuntimeStatus: "running",
+	}); err != nil {
+		t.Fatalf("on-runtime-snapshot 1: %v", err)
+	}
+	intents := publisher.byKind(lobby.NotificationGameTurnReady)
+	if len(intents) != 1 {
+		t.Fatalf("after turn 1 want 1 turn-ready intent, got %d", len(intents))
+	}
+	first := intents[0]
+	wantKey := fmt.Sprintf("turn-ready:%s:1", game.GameID)
+	if first.IdempotencyKey != wantKey {
+		t.Errorf("turn 1 idempotency key = %q, want %q", first.IdempotencyKey, wantKey)
+	}
+	if got := first.Payload["turn"]; got != int32(1) {
+		t.Errorf("turn 1 payload turn = %v, want 1", got)
+	}
+	if got := first.Payload["game_id"]; got != game.GameID.String() {
+		t.Errorf("turn 1 payload game_id = %v, want %s", got, game.GameID)
+	}
+	if len(first.Recipients) != 2 {
+		t.Errorf("turn 1 recipients = %d, want 2", len(first.Recipients))
+	}
+	recipientSet := map[uuid.UUID]struct{}{}
+	for _, r := range first.Recipients {
+		recipientSet[r] = struct{}{}
+	}
+	if _, ok := recipientSet[memberA]; !ok {
+		t.Errorf("turn 1 missing memberA in recipients")
+	}
+	if _, ok := recipientSet[memberB]; !ok {
+		t.Errorf("turn 1 missing memberB in recipients")
+	}
+
+	// Same turn re-delivered (duplicate snapshot, gateway replay) must
+	// not re-emit at the lobby layer: prev catches up to merged.
+	if err := svc.OnRuntimeSnapshot(context.Background(), game.GameID, lobby.RuntimeSnapshot{
+		CurrentTurn:   1,
+		RuntimeStatus: "running",
+	}); err != nil {
+		t.Fatalf("on-runtime-snapshot 1 replay: %v", err)
+	}
+	if got := len(publisher.byKind(lobby.NotificationGameTurnReady)); got != 1 {
+		t.Fatalf("after duplicate turn 1 want 1 intent, got %d", got)
+	}
+
+	// Next turn advances → second emit with key anchored on turn 2.
+	if err := svc.OnRuntimeSnapshot(context.Background(), game.GameID, lobby.RuntimeSnapshot{
+		CurrentTurn:   2,
+		RuntimeStatus: "running",
+	}); err != nil {
+		t.Fatalf("on-runtime-snapshot 2: %v", err)
+	}
+	intents = publisher.byKind(lobby.NotificationGameTurnReady)
+	if len(intents) != 2 {
+		t.Fatalf("after turn 2 want 2 turn-ready intents, got %d", len(intents))
+	}
+	wantKey2 := fmt.Sprintf("turn-ready:%s:2", game.GameID)
+	if intents[1].IdempotencyKey != wantKey2 {
+		t.Errorf("turn 2 idempotency key = %q, want %q", intents[1].IdempotencyKey, wantKey2)
+	}
+	if got := intents[1].Payload["turn"]; got != int32(2) {
+		t.Errorf("turn 2 payload turn = %v, want 2", got)
+	}
+}

backend/internal/lobby/runtime_hooks_unit_test.go

@@ -0,0 +1,127 @@
+package lobby
+
+import "testing"
+
+// TestNextStatusFromSnapshot covers the pure status-mapping function
+// that drives `OnRuntimeSnapshot`'s lifecycle transitions. The Phase
+// 25 contribution is the `running → paused` branch on
+// `engine_unreachable` / `generation_failed`: the order handler relies
+// on the `paused` game status to reject late submits with
+// `turn_already_closed`.
+func TestNextStatusFromSnapshot(t *testing.T) {
+	t.Parallel()
+
+	tests := []struct {
+		name          string
+		currentStatus string
+		runtimeStatus string
+		wantStatus    string
+		wantTransit   bool
+	}{
+		{
+			name:          "starting then running flips to running",
+			currentStatus: GameStatusStarting,
+			runtimeStatus: "running",
+			wantStatus:    GameStatusRunning,
+			wantTransit:   true,
+		},
+		{
+			name:          "running on running snapshot does not transit",
+			currentStatus: GameStatusRunning,
+			runtimeStatus: "running",
+			wantStatus:    GameStatusRunning,
+			wantTransit:   false,
+		},
+		{
+			name:          "starting then engine_unreachable flips to start_failed",
+			currentStatus: GameStatusStarting,
+			runtimeStatus: "engine_unreachable",
+			wantStatus:    GameStatusStartFailed,
+			wantTransit:   true,
+		},
+		{
+			name:          "starting then generation_failed flips to start_failed",
+			currentStatus: GameStatusStarting,
+			runtimeStatus: "generation_failed",
+			wantStatus:    GameStatusStartFailed,
+			wantTransit:   true,
+		},
+		{
+			name:          "running then engine_unreachable flips to paused",
+			currentStatus: GameStatusRunning,
+			runtimeStatus: "engine_unreachable",
+			wantStatus:    GameStatusPaused,
+			wantTransit:   true,
+		},
+		{
+			name:          "running then generation_failed flips to paused",
+			currentStatus: GameStatusRunning,
+			runtimeStatus: "generation_failed",
+			wantStatus:    GameStatusPaused,
+			wantTransit:   true,
+		},
+		{
+			name:          "paused stays paused on repeated failed snapshot",
+			currentStatus: GameStatusPaused,
+			runtimeStatus: "generation_failed",
+			wantStatus:    GameStatusPaused,
+			wantTransit:   false,
+		},
+		{
+			name:          "starting then start_failed flips to start_failed",
+			currentStatus: GameStatusStarting,
+			runtimeStatus: "start_failed",
+			wantStatus:    GameStatusStartFailed,
+			wantTransit:   true,
+		},
+		{
+			name:          "running ignores start_failed",
+			currentStatus: GameStatusRunning,
+			runtimeStatus: "start_failed",
+			wantStatus:    GameStatusRunning,
+			wantTransit:   false,
+		},
+		{
+			name:          "running on finished flips to finished",
+			currentStatus: GameStatusRunning,
+			runtimeStatus: "finished",
+			wantStatus:    GameStatusFinished,
+			wantTransit:   true,
+		},
+		{
+			name:          "finished stays finished on finished snapshot",
+			currentStatus: GameStatusFinished,
+			runtimeStatus: "finished",
+			wantStatus:    GameStatusFinished,
+			wantTransit:   false,
+		},
+		{
+			name:          "cancelled stays cancelled on finished snapshot",
+			currentStatus: GameStatusCancelled,
+			runtimeStatus: "finished",
+			wantStatus:    GameStatusCancelled,
+			wantTransit:   false,
+		},
+		{
+			name:          "paused on stopped snapshot flips to finished",
+			currentStatus: GameStatusPaused,
+			runtimeStatus: "stopped",
+			wantStatus:    GameStatusFinished,
+			wantTransit:   true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+			got, transit := nextStatusFromSnapshot(tt.currentStatus, RuntimeSnapshot{
+				RuntimeStatus: tt.runtimeStatus,
+			})
+			if got != tt.wantStatus {
+				t.Errorf("status = %q, want %q", got, tt.wantStatus)
+			}
+			if transit != tt.wantTransit {
+				t.Errorf("transit = %v, want %v", transit, tt.wantTransit)
+			}
+		})
+	}
+}

backend/internal/lobby/store.go

@@ -232,6 +232,22 @@ func (s *Store) ListMyGames(ctx context.Context, userID uuid.UUID) ([]GameRecord
 	return modelsToGameRecords(rows)
 }
 
+// DeleteGame removes the row at gameID. Cascades through every
+// referencing table (memberships / applications / invites /
+// runtime_records / player_mappings — all declared with ON DELETE
+// CASCADE in `00001_init.sql`). Idempotent: returns nil when no row
+// matches. Used by the dev-sandbox bootstrap to scrub terminal
+// games on every backend boot so the developer's lobby never piles
+// up cancelled tiles.
+func (s *Store) DeleteGame(ctx context.Context, gameID uuid.UUID) error {
+	g := table.Games
+	stmt := g.DELETE().WHERE(g.GameID.EQ(postgres.UUID(gameID)))
+	if _, err := stmt.ExecContext(ctx, s.db); err != nil {
+		return fmt.Errorf("lobby store: delete game %s: %w", gameID, err)
+	}
+	return nil
+}
+
 // gameUpdate is the parameter struct for UpdateGame. Nil pointers leave
 // the corresponding column alone.
 type gameUpdate struct {

backend/internal/notification/catalog.go

@@ -17,6 +17,8 @@ const (
 	KindRuntimeImagePullFailed = "runtime.image_pull_failed"
 	KindRuntimeContainerStartFailed = "runtime.container_start_failed"
 	KindRuntimeStartConfigInvalid = "runtime.start_config_invalid"
+	KindGameTurnReady = "game.turn.ready"
+	KindGamePaused = "game.paused"
 )
 
 // CatalogEntry describes the per-kind delivery policy: which channels
@@ -95,6 +97,12 @@ var catalog = map[string]CatalogEntry{
 		Admin: true,
 		MailTemplateID: KindRuntimeStartConfigInvalid,
 	},
+	KindGameTurnReady: {
+		Channels: []string{ChannelPush},
+	},
+	KindGamePaused: {
+		Channels: []string{ChannelPush},
+	},
 }
 
 // LookupCatalog returns the per-kind policy and a boolean reporting
@@ -123,5 +131,7 @@ func SupportedKinds() []string {
 		KindRuntimeImagePullFailed,
 		KindRuntimeContainerStartFailed,
 		KindRuntimeStartConfigInvalid,
+		KindGameTurnReady,
+		KindGamePaused,
 	}
 }

backend/internal/notification/catalog_test.go

@@ -39,6 +39,8 @@ func TestCatalogChannels(t *testing.T) {
 		KindRuntimeImagePullFailed:      {ChannelEmail},
 		KindRuntimeContainerStartFailed: {ChannelEmail},
 		KindRuntimeStartConfigInvalid:   {ChannelEmail},
+		KindGameTurnReady:               {ChannelPush},
+		KindGamePaused:                  {ChannelPush},
 	}
 	for kind, want := range expect {
 		entry, ok := LookupCatalog(kind)

backend/internal/notification/events_test.go

@@ -9,9 +9,31 @@ import (
 	"github.com/google/uuid"
 )
 
+// jsonFriendlyKinds lists catalog kinds whose payload is small and
+// stable enough that the gateway-bound encoding stays JSON instead of
+// FlatBuffers. The default for new producers is still FB; declaring a
+// kind here is a deliberate decision baked into the build target's
+// payload contract.
+//
+// `game.turn.ready` ships `{game_id, turn}` only, the UI parses it
+// inline in `routes/games/[id]/+layout.svelte` (Phase 24), and no
+// other consumer reads the payload — adopting the FB encoder would
+// require a new TS notification stub set and the regen tooling for
+// `pkg/schema/fbs/notification.fbs` without buying anything.
+//
+// `game.paused` (Phase 25) follows the same JSON-friendly contract:
+// payload is `{game_id, turn, reason}` consumed by the same in-game
+// shell layout, so there is no value in dragging a FB schema in for
+// one consumer.
+var jsonFriendlyKinds = map[string]bool{
+	KindGameTurnReady: true,
+	KindGamePaused:    true,
+}
+
 // TestBuildClientPushEventCoversCatalog asserts that every catalog kind
-// returns a typed FB event (preMarshaledEvent) and that an unknown kind
-// falls through to the JSON safety net.
+// is exercised by this test, that FB-typed kinds return a
+// `preMarshaledEvent`, and that JSON-friendly kinds (see
+// `jsonFriendlyKinds` above) return a `push.JSONEvent`.
 func TestBuildClientPushEventCoversCatalog(t *testing.T) {
 	t.Parallel()
 
@@ -57,6 +79,15 @@ func TestBuildClientPushEventCoversCatalog(t *testing.T) {
 			"game_id": gameID.String(),
 			"reason":  "missing engine version",
 		}},
+		{"game turn ready", KindGameTurnReady, map[string]any{
+			"game_id": gameID.String(),
+			"turn":    int32(7),
+		}},
+		{"game paused", KindGamePaused, map[string]any{
+			"game_id": gameID.String(),
+			"turn":    int32(7),
+			"reason":  "generation_failed",
+		}},
 	}
 
 	seenKinds := map[string]bool{}
@@ -78,8 +109,10 @@ func TestBuildClientPushEventCoversCatalog(t *testing.T) {
 			if len(bytes) == 0 {
 				t.Fatalf("Marshal returned empty bytes")
 			}
-			if _, isJSON := event.(push.JSONEvent); isJSON {
-				t.Fatalf("expected typed FB event for %s, got JSONEvent", tt.kind)
+			_, isJSON := event.(push.JSONEvent)
+			wantJSON := jsonFriendlyKinds[tt.kind]
+			if isJSON != wantJSON {
+				t.Fatalf("kind %s: JSONEvent=%v, want JSONEvent=%v", tt.kind, isJSON, wantJSON)
 			}
 		})
 		seenKinds[tt.kind] = true

backend/internal/postgres/migrations/00001_init.sql

@@ -418,7 +418,7 @@ CREATE INDEX race_names_pending_eligible_idx
 -- finished) and the container-state escape hatch (removed) used by
 -- reconciliation when the recorded container has disappeared.
 CREATE TABLE runtime_records (
-    game_id                  uuid        PRIMARY KEY,
+    game_id                  uuid        PRIMARY KEY REFERENCES games (game_id) ON DELETE CASCADE,
     status                   text        NOT NULL,
     current_container_id     text,
     current_image_ref        text,
@@ -465,7 +465,7 @@ CREATE TABLE engine_versions (
 -- roster reads. The partial UNIQUE on (game_id, race_name) enforces the
 -- one-race-per-game invariant at the storage boundary.
 CREATE TABLE player_mappings (
-    game_id             uuid        NOT NULL,
+    game_id             uuid        NOT NULL REFERENCES games (game_id) ON DELETE CASCADE,
     user_id             uuid        NOT NULL,
     race_name           text        NOT NULL,
     engine_player_uuid  uuid        NOT NULL,
@@ -605,7 +605,8 @@ CREATE TABLE notifications (
             'lobby.race_name.registered', 'lobby.race_name.pending',
             'lobby.race_name.expired',
             'runtime.image_pull_failed', 'runtime.container_start_failed',
-            'runtime.start_config_invalid'
+            'runtime.start_config_invalid',
+            'game.turn.ready', 'game.paused'
         ))
 );
 

backend/internal/runtime/errors.go

@@ -42,4 +42,23 @@ var (
 	// ErrShutdown means the runtime service has stopped accepting
 	// work because the parent context was cancelled.
 	ErrShutdown = errors.New("runtime: shutting down")
+
+	// ErrTurnAlreadyClosed reports that the runtime is currently
+	// producing a turn — runtime status is `generation_in_progress`
+	// — and the engine is not accepting writes for the closing
+	// turn. Handlers map this to HTTP 409 with httperr code
+	// `turn_already_closed`; the UI shows a conflict banner and
+	// waits for the next `game.turn.ready` push.
+	ErrTurnAlreadyClosed = errors.New("runtime: turn already closed")
+
+	// ErrGamePaused reports that the game is not in a state that
+	// accepts user-games commands or orders: the runtime row
+	// carries `paused = true`, or the runtime status lands on any
+	// terminal value (`engine_unreachable`, `generation_failed`,
+	// `stopped`, `finished`, `removed`), or the game has not yet
+	// finished bootstrapping (`starting`). Handlers map this to
+	// HTTP 409 with httperr code `game_paused`; the UI surfaces a
+	// pause banner and waits for an admin resume or a fresh
+	// snapshot.
+	ErrGamePaused = errors.New("runtime: game paused")
 )

backend/internal/runtime/orders_accept_test.go

@@ -0,0 +1,82 @@
+package runtime
+
+import (
+	"errors"
+	"testing"
+)
+
+// TestOrdersAcceptStatus pins down the Phase 25 pre-check that
+// gates the user-games command/order handlers against the runtime
+// record. The decision must distinguish a turn cutoff (engine is
+// producing) from a paused game so the UI can surface the right
+// banner; all other non-running runtime statuses collapse into
+// `ErrGamePaused`.
+func TestOrdersAcceptStatus(t *testing.T) {
+	t.Parallel()
+
+	tests := []struct {
+		name string
+		rec  RuntimeRecord
+		want error
+	}{
+		{
+			name: "running and not paused accepts orders",
+			rec:  RuntimeRecord{Status: RuntimeStatusRunning, Paused: false},
+			want: nil,
+		},
+		{
+			name: "running but paused returns game paused",
+			rec:  RuntimeRecord{Status: RuntimeStatusRunning, Paused: true},
+			want: ErrGamePaused,
+		},
+		{
+			name: "generation in progress returns turn already closed",
+			rec:  RuntimeRecord{Status: RuntimeStatusGenerationInProgress},
+			want: ErrTurnAlreadyClosed,
+		},
+		{
+			name: "generation failed returns game paused",
+			rec:  RuntimeRecord{Status: RuntimeStatusGenerationFailed},
+			want: ErrGamePaused,
+		},
+		{
+			name: "engine unreachable returns game paused",
+			rec:  RuntimeRecord{Status: RuntimeStatusEngineUnreachable},
+			want: ErrGamePaused,
+		},
+		{
+			name: "stopped returns game paused",
+			rec:  RuntimeRecord{Status: RuntimeStatusStopped},
+			want: ErrGamePaused,
+		},
+		{
+			name: "finished returns game paused",
+			rec:  RuntimeRecord{Status: RuntimeStatusFinished},
+			want: ErrGamePaused,
+		},
+		{
+			name: "removed returns game paused",
+			rec:  RuntimeRecord{Status: RuntimeStatusRemoved},
+			want: ErrGamePaused,
+		},
+		{
+			name: "starting returns game paused",
+			rec:  RuntimeRecord{Status: RuntimeStatusStarting},
+			want: ErrGamePaused,
+		},
+		{
+			name: "paused takes precedence over generation in progress",
+			rec:  RuntimeRecord{Status: RuntimeStatusGenerationInProgress, Paused: true},
+			want: ErrGamePaused,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+			got := OrdersAcceptStatus(tt.rec)
+			if !errors.Is(got, tt.want) {
+				t.Errorf("OrdersAcceptStatus = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}

backend/internal/runtime/scheduler.go

@@ -7,6 +7,7 @@ import (
 	"time"
 
 	"galaxy/backend/internal/dockerclient"
+	"galaxy/backend/internal/engineclient"
 	"galaxy/cronutil"
 
 	"github.com/google/uuid"
@@ -213,6 +214,22 @@ func (sch *Scheduler) loop(ctx context.Context, rec RuntimeRecord, done chan str
 
 // tick runs one engine /admin/turn call under the per-game mutex,
 // publishes the resulting snapshot, and clears `skip_next_tick`.
+//
+// Phase 25 wraps the engine call between two runtime-status flips so
+// the backend order handler can reject late submits while the engine
+// is producing:
+//
+//   - before `Engine.Turn`: runtime status moves to
+//     `generation_in_progress`; the loop's running-only guard tolerates
+//     this because the flip back happens inside the same tick.
+//   - on success: runtime status moves back to `running` (unless the
+//     engine reports `finished`, in which case `publishSnapshot` has
+//     already promoted the row to `finished`).
+//   - on error: runtime status moves to `generation_failed` (engine
+//     validation failure) or `engine_unreachable` (transport / 5xx).
+//     The matching snapshot is forwarded to lobby through
+//     `publishFailureSnapshot` so lobby can flip the game to `paused`
+//     and emit `game.paused`.
 func (sch *Scheduler) tick(ctx context.Context, rec RuntimeRecord) error {
 	mu := sch.svc.gameLock(rec.GameID)
 	if !mu.TryLock() {
@@ -224,10 +241,24 @@ func (sch *Scheduler) tick(ctx context.Context, rec RuntimeRecord) error {
 	if err != nil {
 		return err
 	}
+	if _, err := sch.svc.transitionRuntimeStatus(ctx, rec.GameID, RuntimeStatusGenerationInProgress, ""); err != nil {
+		sch.svc.completeOperation(ctx, op, err)
+		return err
+	}
 	state, err := sch.svc.deps.Engine.Turn(ctx, rec.EngineEndpoint)
 	if err != nil {
 		sch.svc.completeOperation(ctx, op, err)
-		_, _ = sch.svc.transitionRuntimeStatus(ctx, rec.GameID, RuntimeStatusEngineUnreachable, "")
+		failureStatus := RuntimeStatusEngineUnreachable
+		if errors.Is(err, engineclient.ErrEngineValidation) {
+			failureStatus = RuntimeStatusGenerationFailed
+		}
+		_, _ = sch.svc.transitionRuntimeStatus(ctx, rec.GameID, failureStatus, "down")
+		if pubErr := sch.svc.publishFailureSnapshot(ctx, rec.GameID, failureStatus); pubErr != nil {
+			sch.svc.deps.Logger.Warn("publish failure snapshot to lobby",
+				zap.String("game_id", rec.GameID.String()),
+				zap.String("runtime_status", failureStatus),
+				zap.Error(pubErr))
+		}
 		// On engine unreachable, also clear skip_next_tick so the next
 		// real tick can start fresh.
 		_ = sch.clearSkipFlag(ctx, rec.GameID)
@@ -244,6 +275,12 @@ func (sch *Scheduler) tick(ctx context.Context, rec RuntimeRecord) error {
 		sch.svc.completeOperation(ctx, op, err)
 		return err
 	}
+	if !state.Finished {
+		// `publishSnapshot` patches CurrentTurn / EngineHealth but does
+		// not reset the status column; reopen the orders window here so
+		// the next loop iteration finds the runtime back in `running`.
+		_, _ = sch.svc.transitionRuntimeStatus(ctx, rec.GameID, RuntimeStatusRunning, "ok")
+	}
 	sch.svc.completeOperation(ctx, op, nil)
 	_ = sch.clearSkipFlag(ctx, rec.GameID)
 	return nil

backend/internal/runtime/service.go

@@ -257,6 +257,57 @@ func (s *Service) ResolvePlayerMapping(ctx context.Context, gameID, userID uuid.
 	return s.deps.Store.LoadPlayerMapping(ctx, gameID, userID)
 }
 
+// CheckOrdersAccept verifies that the runtime is in a state that
+// accepts user-games commands and orders. It is called by the user
+// game-proxy handlers (`Commands`, `Orders`) before forwarding to
+// engine, so the backend's turn-cutoff and pause guards run before
+// network traffic leaves the host. The decision itself lives in the
+// pure helper `OrdersAcceptStatus` so it can be unit-tested without
+// constructing a full Service.
+//
+// A missing runtime row is surfaced as `ErrNotFound` so the handler
+// keeps its existing 404 behaviour.
+func (s *Service) CheckOrdersAccept(ctx context.Context, gameID uuid.UUID) error {
+	rec, err := s.GetRuntime(ctx, gameID)
+	if err != nil {
+		return err
+	}
+	return OrdersAcceptStatus(rec)
+}
+
+// OrdersAcceptStatus inspects a runtime record and returns the
+// matching sentinel for the user-games order/command pre-check:
+//
+//   - `runtime_status = generation_in_progress` → `ErrTurnAlreadyClosed`.
+//     The cron-driven `Scheduler.tick` has flipped the row before
+//     calling the engine. The order window reopens once the tick
+//     completes successfully.
+//
+//   - `runtime_status ∈ {engine_unreachable, generation_failed,
+//     stopped, finished, removed, starting}` → `ErrGamePaused`.
+//     The game is not in a state that accepts writes; the lobby
+//     state machine has either already flipped the game to
+//     `paused` / `finished` or is still bootstrapping.
+//
+//   - `runtime.Paused = true` → `ErrGamePaused`. The lobby admin
+//     paused the game explicitly.
+//
+//   - `runtime_status = running` and `Paused = false` → nil
+//     (forward).
+func OrdersAcceptStatus(rec RuntimeRecord) error {
+	if rec.Paused {
+		return ErrGamePaused
+	}
+	switch rec.Status {
+	case RuntimeStatusRunning:
+		return nil
+	case RuntimeStatusGenerationInProgress:
+		return ErrTurnAlreadyClosed
+	default:
+		return ErrGamePaused
+	}
+}
+
 // EngineEndpoint returns the engine endpoint URL for gameID. Used by
 // the user game-proxy handlers.
 func (s *Service) EngineEndpoint(ctx context.Context, gameID uuid.UUID) (string, error) {
@@ -812,6 +863,33 @@ func (s *Service) publishSnapshot(ctx context.Context, gameID uuid.UUID, state r
 	return nil
 }
 
+// publishFailureSnapshot forwards a runtime-failure observation to
+// lobby so the game lifecycle can react (e.g. flipping `running` to
+// `paused` on `engine_unreachable` / `generation_failed` per Phase
+// 25). The snapshot carries the unchanged `current_turn` because no
+// new turn has been produced; lobby uses the turn number to anchor
+// the `game.paused` idempotency key.
+//
+// The call is best-effort: lobby errors are returned to the caller
+// (the scheduler tick) so the warn-level logging stays in one place.
+// A missing runtime cache entry (e.g. the row was just removed by
+// the reconciler) collapses into a silent no-op.
+func (s *Service) publishFailureSnapshot(ctx context.Context, gameID uuid.UUID, runtimeStatus string) error {
+	if s.deps.Lobby == nil {
+		return nil
+	}
+	rec, ok := s.deps.Cache.GetRuntime(gameID)
+	if !ok {
+		return nil
+	}
+	return s.deps.Lobby.OnRuntimeSnapshot(ctx, gameID, LobbySnapshot{
+		CurrentTurn:   rec.CurrentTurn,
+		RuntimeStatus: runtimeStatus,
+		EngineHealth:  "down",
+		ObservedAt:    s.deps.Now().UTC(),
+	})
+}
+
 // transitionRuntimeStatus updates the status / engine_health columns
 // and refreshes the cache.
 func (s *Service) transitionRuntimeStatus(ctx context.Context, gameID uuid.UUID, status, health string) (RuntimeRecord, error) {

backend/internal/runtime/service_e2e_test.go

@@ -200,6 +200,8 @@ func TestServiceStartGameEndToEnd(t *testing.T) {
 	engineSrv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		w.Header().Set("Content-Type", "application/json")
 		switch r.URL.Path {
+		case "/healthz":
+			w.WriteHeader(http.StatusOK)
 		case "/api/v1/admin/init":
 			_ = json.NewEncoder(w).Encode(rest.StateResponse{ID: gameID, Turn: 0, Players: []rest.PlayerState{{RaceName: "Alpha", Planets: 3, Population: 10}}})
 		case "/api/v1/admin/status":

backend/internal/server/contract_test.go

@@ -45,11 +45,20 @@ var pathParamStubs = map[string]string{
 	"delivery_id": "00000000-0000-0000-0000-000000000006",
 	"user_id": "00000000-0000-0000-0000-000000000007",
 	"device_session_id": "00000000-0000-0000-0000-000000000008",
+	"battle_id": "00000000-0000-0000-0000-000000000009",
 	"id": "1.2.3",
 	"username": "alice",
 	"turn": "42",
 }
 
+// queryParamStubs lists the deterministic substitutions used to fill
+// query-string parameters declared in `openapi.yaml`. Every required
+// query parameter must have an entry here; optional ones can stay
+// blank (the contract test omits them when no stub is registered).
+var queryParamStubs = map[string]string{
+	"turn": "42",
+}
+
 // requestBodyStubs lists the JSON request bodies the contract test sends for
 // each operationId. Operations missing from the map default to an empty
 // object `{}`, which is a valid placeholder thanks to `additionalProperties:
@@ -323,6 +332,9 @@ func buildRequest(t *testing.T, c contractOperation) *http.Request {
 	t.Helper()
 
 	target := substitutePathParams(t, c.path)
+	if query := buildQuery(t, c); query != "" {
+		target += "?" + query
+	}
 	url := "http://backend.internal" + target
 
 	body := bodyFor(t, c)
@@ -376,6 +388,31 @@ func bodyFor(t *testing.T, c contractOperation) requestBody {
 	}
 }
 
+func buildQuery(t *testing.T, c contractOperation) string {
+	t.Helper()
+	if c.op == nil {
+		return ""
+	}
+	values := make([]string, 0, len(c.op.Parameters))
+	for _, p := range c.op.Parameters {
+		if p == nil || p.Value == nil {
+			continue
+		}
+		if p.Value.In != "query" {
+			continue
+		}
+		stub, ok := queryParamStubs[p.Value.Name]
+		if !ok {
+			if p.Value.Required {
+				t.Fatalf("operation %q requires query parameter %q with no stub registered", c.operationID, p.Value.Name)
+			}
+			continue
+		}
+		values = append(values, p.Value.Name+"="+stub)
+	}
+	return strings.Join(values, "&")
+}
+
 func substitutePathParams(t *testing.T, templated string) string {
 	t.Helper()
 

backend/internal/server/handlers_user_games.go

@@ -14,7 +14,6 @@ import (
 	"galaxy/backend/internal/server/httperr"
 	"galaxy/backend/internal/server/middleware/userid"
 	"galaxy/backend/internal/telemetry"
-	"galaxy/model/order"
 	gamerest "galaxy/model/rest"
 
 	"github.com/gin-gonic/gin"
@@ -26,8 +25,8 @@ import (
 // `engineclient` against running engine containers.
 type UserGamesHandlers struct {
 	runtime *runtime.Service
-	engine *engineclient.Client
-	logger *zap.Logger
+	engine  *engineclient.Client
+	logger  *zap.Logger
 }
 
 // NewUserGamesHandlers constructs the handler set. When runtime or
@@ -61,6 +60,10 @@ func (h *UserGamesHandlers) Commands() gin.HandlerFunc {
 			return
 		}
 		ctx := c.Request.Context()
+		if err := h.runtime.CheckOrdersAccept(ctx, gameID); err != nil {
+			respondGameProxyError(c, h.logger, "user games commands", ctx, err)
+			return
+		}
 		mapping, err := h.runtime.ResolvePlayerMapping(ctx, gameID, userID)
 		if err != nil {
 			respondGameProxyError(c, h.logger, "user games commands", ctx, err)
@@ -106,6 +109,10 @@ func (h *UserGamesHandlers) Orders() gin.HandlerFunc {
 			return
 		}
 		ctx := c.Request.Context()
+		if err := h.runtime.CheckOrdersAccept(ctx, gameID); err != nil {
+			respondGameProxyError(c, h.logger, "user games orders", ctx, err)
+			return
+		}
 		mapping, err := h.runtime.ResolvePlayerMapping(ctx, gameID, userID)
 		if err != nil {
 			respondGameProxyError(c, h.logger, "user games orders", ctx, err)
@@ -123,7 +130,6 @@ func (h *UserGamesHandlers) Orders() gin.HandlerFunc {
 		// handler. Per ARCHITECTURE.md §9 backend is the only caller
 		// of the engine, so the body never carries a client-supplied
 		// actor.
-		_ = order.Order{}
 		payload, err := rebindActor(body, mapping.RaceName)
 		if err != nil {
 			httperr.Abort(c, http.StatusBadRequest, httperr.CodeInvalidRequest, "request body must be a JSON object")
@@ -138,6 +144,64 @@ func (h *UserGamesHandlers) Orders() gin.HandlerFunc {
 	}
 }
 
+// GetOrders handles GET /api/v1/user/games/{game_id}/orders?turn=N.
+// Forwards to the engine's `GET /api/v1/order` with the player rebound
+// from the runtime mapping. The query parameter `turn` is required
+// and must be a non-negative integer; the engine itself enforces the
+// same rule, but rejecting up-front saves a network hop.
+//
+// On `204 No Content` the handler answers `204` so the gateway can
+// translate the FBS envelope to `found = false`. On `200` the
+// engine's body is forwarded verbatim — the gateway re-encodes the
+// JSON `UserGamesOrder` shape into FlatBuffers.
+func (h *UserGamesHandlers) GetOrders() gin.HandlerFunc {
+	if h == nil || h.runtime == nil || h.engine == nil {
+		return handlers.NotImplemented("userGamesGetOrders")
+	}
+	return func(c *gin.Context) {
+		gameID, ok := parseGameIDParam(c)
+		if !ok {
+			return
+		}
+		turnRaw := c.Query("turn")
+		if turnRaw == "" {
+			httperr.Abort(c, http.StatusBadRequest, httperr.CodeInvalidRequest, "turn is required")
+			return
+		}
+		turn, err := strconv.Atoi(turnRaw)
+		if err != nil || turn < 0 {
+			httperr.Abort(c, http.StatusBadRequest, httperr.CodeInvalidRequest, "turn must be a non-negative integer")
+			return
+		}
+		userID, ok := userid.FromContext(c.Request.Context())
+		if !ok {
+			httperr.Abort(c, http.StatusBadRequest, httperr.CodeInvalidRequest, "user id missing")
+			return
+		}
+		ctx := c.Request.Context()
+		mapping, err := h.runtime.ResolvePlayerMapping(ctx, gameID, userID)
+		if err != nil {
+			respondGameProxyError(c, h.logger, "user games get orders", ctx, err)
+			return
+		}
+		endpoint, err := h.runtime.EngineEndpoint(ctx, gameID)
+		if err != nil {
+			respondGameProxyError(c, h.logger, "user games get orders", ctx, err)
+			return
+		}
+		body, status, err := h.engine.GetOrder(ctx, endpoint, mapping.RaceName, turn)
+		if err != nil {
+			respondEngineProxyError(c, h.logger, "user games get orders", ctx, body, err)
+			return
+		}
+		if status == http.StatusNoContent {
+			c.Status(http.StatusNoContent)
+			return
+		}
+		c.Data(http.StatusOK, "application/json", body)
+	}
+}
+
 // Report handles GET /api/v1/user/games/{game_id}/reports/{turn}.
 func (h *UserGamesHandlers) Report() gin.HandlerFunc {
 	if h == nil || h.runtime == nil || h.engine == nil {
@@ -179,6 +243,60 @@ func (h *UserGamesHandlers) Report() gin.HandlerFunc {
 	}
 }
 
+// Battle handles GET /api/v1/user/games/{game_id}/battles/{turn}/{battle_id}.
+// Forwards to the engine's `GET /api/v1/battle/:turn/:uuid`. Path
+// parameters are validated up-front to save a network hop. 404 from
+// the engine is forwarded as 404. The recipient race is resolved
+// from the runtime mapping but not forwarded — engine returns the
+// battle by id, visibility is enforced by the engine state.
+func (h *UserGamesHandlers) Battle() gin.HandlerFunc {
+	if h == nil || h.runtime == nil || h.engine == nil {
+		return handlers.NotImplemented("userGamesBattle")
+	}
+	return func(c *gin.Context) {
+		gameID, ok := parseGameIDParam(c)
+		if !ok {
+			return
+		}
+		turnRaw := c.Param("turn")
+		turn, err := strconv.Atoi(turnRaw)
+		if err != nil || turn < 0 {
+			httperr.Abort(c, http.StatusBadRequest, httperr.CodeInvalidRequest, "turn must be a non-negative integer")
+			return
+		}
+		battleID := c.Param("battle_id")
+		if battleID == "" {
+			httperr.Abort(c, http.StatusBadRequest, httperr.CodeInvalidRequest, "battle id is required")
+			return
+		}
+		userID, ok := userid.FromContext(c.Request.Context())
+		if !ok {
+			httperr.Abort(c, http.StatusBadRequest, httperr.CodeInvalidRequest, "user id missing")
+			return
+		}
+		ctx := c.Request.Context()
+		if _, err := h.runtime.ResolvePlayerMapping(ctx, gameID, userID); err != nil {
+			respondGameProxyError(c, h.logger, "user games battle", ctx, err)
+			return
+		}
+		endpoint, err := h.runtime.EngineEndpoint(ctx, gameID)
+		if err != nil {
+			respondGameProxyError(c, h.logger, "user games battle", ctx, err)
+			return
+		}
+		body, status, err := h.engine.FetchBattle(ctx, endpoint, turn, battleID)
+		if err != nil {
+			respondEngineProxyError(c, h.logger, "user games battle", ctx, body, err)
+			return
+		}
+		if status == http.StatusNotFound {
+			httperr.Abort(c, http.StatusNotFound, httperr.CodeNotFound, "battle not found")
+			return
+		}
+		c.Data(http.StatusOK, "application/json", body)
+	}
+}
+
 // rebindActor decodes a JSON object from raw, sets `actor` to
 // raceName, and re-encodes. Backend never trusts the actor field
 // supplied by the client (per ARCHITECTURE.md §9).
@@ -201,6 +319,12 @@ func respondGameProxyError(c *gin.Context, logger *zap.Logger, op string, ctx co
 	switch {
 	case errors.Is(err, runtime.ErrNotFound):
 		httperr.Abort(c, http.StatusNotFound, httperr.CodeNotFound, "no runtime mapping for this user/game")
+	case errors.Is(err, runtime.ErrTurnAlreadyClosed):
+		httperr.Abort(c, http.StatusConflict, httperr.CodeTurnAlreadyClosed,
+			"turn already closed; orders are not accepted while the engine is producing")
+	case errors.Is(err, runtime.ErrGamePaused):
+		httperr.Abort(c, http.StatusConflict, httperr.CodeGamePaused,
+			"game is paused; orders are not accepted until it resumes")
 	case errors.Is(err, runtime.ErrConflict):
 		httperr.Abort(c, http.StatusConflict, httperr.CodeConflict, err.Error())
 	default:

backend/internal/server/handlers_user_lobby_helpers.go

@@ -89,9 +89,12 @@ type gameSummaryWire struct {
 	EnrollmentEndsAt string  `json:"enrollment_ends_at"`
 	CreatedAt        string  `json:"created_at"`
 	UpdatedAt        string  `json:"updated_at"`
+	CurrentTurn      int32   `json:"current_turn"`
 }
 
 // lobbyGameDetailWire mirrors `LobbyGameDetail` from openapi.yaml.
+// `current_turn` is inherited from `gameSummaryWire`; the runtime
+// fields below carry the runtime projection on top of it.
 type lobbyGameDetailWire struct {
 	gameSummaryWire
 	Visibility          string  `json:"visibility"`
@@ -100,7 +103,6 @@ type lobbyGameDetailWire struct {
 	TargetEngineVersion string  `json:"target_engine_version"`
 	StartGapHours       int32   `json:"start_gap_hours"`
 	StartGapPlayers     int32   `json:"start_gap_players"`
-	CurrentTurn         int32   `json:"current_turn"`
 	RuntimeStatus       string  `json:"runtime_status"`
 	EngineHealth        string  `json:"engine_health,omitempty"`
 	StartedAt           *string `json:"started_at,omitempty"`
@@ -118,6 +120,7 @@ func gameSummaryToWire(g lobby.GameRecord) gameSummaryWire {
 		EnrollmentEndsAt: g.EnrollmentEndsAt.UTC().Format(timestampLayout),
 		CreatedAt:        g.CreatedAt.UTC().Format(timestampLayout),
 		UpdatedAt:        g.UpdatedAt.UTC().Format(timestampLayout),
+		CurrentTurn:      g.RuntimeSnapshot.CurrentTurn,
 	}
 	if g.OwnerUserID != nil {
 		s := g.OwnerUserID.String()
@@ -135,7 +138,6 @@ func lobbyGameDetailToWire(g lobby.GameRecord) lobbyGameDetailWire {
 		TargetEngineVersion: g.TargetEngineVersion,
 		StartGapHours:       g.StartGapHours,
 		StartGapPlayers:     g.StartGapPlayers,
-		CurrentTurn:         g.RuntimeSnapshot.CurrentTurn,
 		RuntimeStatus:       g.RuntimeSnapshot.RuntimeStatus,
 		EngineHealth:        g.RuntimeSnapshot.EngineHealth,
 	}

backend/internal/server/httperr/httperr.go

@@ -23,6 +23,22 @@ const (
 	CodeMethodNotAllowed   = "method_not_allowed"
 	CodeInternalError      = "internal_error"
 	CodeServiceUnavailable = "service_unavailable"
+
+	// CodeTurnAlreadyClosed marks a user-games command or order rejection
+	// caused by the backend's turn-cutoff guard: the request arrived
+	// after the active turn started generating (runtime status
+	// `generation_in_progress` / `generation_failed` / `engine_unreachable`)
+	// and the engine no longer accepts writes for the closing turn. The
+	// caller is expected to wait for the next `game.turn.ready` push and
+	// resubmit against the new turn.
+	CodeTurnAlreadyClosed = "turn_already_closed"
+
+	// CodeGamePaused marks a user-games command or order rejection caused
+	// by the lobby-side game lifecycle: the game is in `paused`,
+	// `finished`, or any other status that does not accept writes. The
+	// caller is expected to wait for the game to resume before
+	// resubmitting.
+	CodeGamePaused = "game_paused"
 )
 
 // Body stores the inner `error` object of the standard envelope.

backend/internal/server/router.go

@@ -261,7 +261,9 @@ func registerUserRoutes(router *gin.Engine, instruments *metrics.Instruments, de
 	userGames := group.Group("/games")
 	userGames.POST("/:game_id/commands", deps.UserGames.Commands())
 	userGames.POST("/:game_id/orders", deps.UserGames.Orders())
+	userGames.GET("/:game_id/orders", deps.UserGames.GetOrders())
 	userGames.GET("/:game_id/reports/:turn", deps.UserGames.Report())
+	userGames.GET("/:game_id/battles/:turn/:battle_id", deps.UserGames.Battle())
 
 	userSessions := group.Group("/sessions")
 	userSessions.GET("", deps.UserSessions.List())

backend/openapi.yaml

@@ -1023,7 +1023,11 @@ paths:
               $ref: "#/components/schemas/EngineOrder"
       responses:
         "200":
-          description: Engine order validation result passed through.
+          description: |
+            Engine order validation result passed through. Body is the
+            engine's `UserGamesOrder` shape — game_id, updatedAt, and
+            the per-command `cmd[]` list with `cmdApplied` /
+            `cmdErrorCode` populated by the engine.
           content:
             application/json:
               schema:
@@ -1036,6 +1040,46 @@ paths:
           $ref: "#/components/responses/NotImplementedError"
         "500":
           $ref: "#/components/responses/InternalError"
+    get:
+      tags: [User]
+      operationId: userGamesGetOrders
+      summary: Read the player's stored order for a turn
+      description: |
+        Forwards `GET /api/v1/order` against the engine container.
+        The caller always knows the current turn from the lobby
+        record at game boot, so `turn` is required.
+      security:
+        - UserHeader: []
+      parameters:
+        - $ref: "#/components/parameters/XUserID"
+        - $ref: "#/components/parameters/GameID"
+        - name: turn
+          in: query
+          required: true
+          description: Turn number whose stored order to fetch. Non-negative.
+          schema:
+            type: integer
+            format: int32
+            minimum: 0
+      responses:
+        "200":
+          description: |
+            Engine returned the stored order for this player + turn.
+            Body is the engine's `UserGamesOrder` shape.
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/PassthroughObject"
+        "204":
+          description: No order has been stored for this player on this turn.
+        "400":
+          $ref: "#/components/responses/InvalidRequestError"
+        "404":
+          $ref: "#/components/responses/NotFoundError"
+        "501":
+          $ref: "#/components/responses/NotImplementedError"
+        "500":
+          $ref: "#/components/responses/InternalError"
   /api/v1/user/games/{game_id}/reports/{turn}:
     get:
       tags: [User]
@@ -1062,6 +1106,44 @@ paths:
           $ref: "#/components/responses/NotImplementedError"
         "500":
           $ref: "#/components/responses/InternalError"
+  /api/v1/user/games/{game_id}/battles/{turn}/{battle_id}:
+    get:
+      tags: [User]
+      operationId: userGamesBattle
+      summary: Read one engine battle report
+      description: |
+        Forwards to the engine's `GET /api/v1/battle/:turn/:uuid`. The
+        engine response body is passed through verbatim. `404 Not Found`
+        is returned when the battle does not exist for the supplied
+        `turn` / `battle_id` pair.
+      security:
+        - UserHeader: []
+      parameters:
+        - $ref: "#/components/parameters/XUserID"
+        - $ref: "#/components/parameters/GameID"
+        - $ref: "#/components/parameters/Turn"
+        - name: battle_id
+          in: path
+          required: true
+          description: Battle identifier (RFC 4122 UUID).
+          schema:
+            type: string
+            format: uuid
+      responses:
+        "200":
+          description: Engine battle report passed through.
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/PassthroughObject"
+        "400":
+          $ref: "#/components/responses/InvalidRequestError"
+        "404":
+          $ref: "#/components/responses/NotFoundError"
+        "501":
+          $ref: "#/components/responses/NotImplementedError"
+        "500":
+          $ref: "#/components/responses/InternalError"
   /api/v1/user/sessions:
     get:
       tags: [User]
@@ -2270,9 +2352,10 @@ components:
           type: string
           description: |
             Stable machine-readable failure marker. The closed set is
-            `not_implemented`, `invalid_request`, `unauthorized`, `not_found`,
-            `conflict`, `method_not_allowed`, `internal_error`,
-            `service_unavailable`.
+            `not_implemented`, `invalid_request`, `unauthorized`,
+            `forbidden`, `not_found`, `conflict`, `method_not_allowed`,
+            `internal_error`, `service_unavailable`,
+            `turn_already_closed`, `game_paused`.
           enum:
             - not_implemented
             - invalid_request
@@ -2283,6 +2366,8 @@ components:
             - method_not_allowed
             - internal_error
             - service_unavailable
+            - turn_already_closed
+            - game_paused
         message:
           type: string
           description: Human-readable client-safe failure description.
@@ -2303,7 +2388,13 @@ components:
           format: email
         locale:
           type: string
-          description: Optional BCP 47 locale tag preferred for the delivered code.
+          description: |
+            Optional BCP 47 locale tag preferred for the delivered code.
+            Read by the gateway in preference to the request
+            `Accept-Language` header so Safari clients (which silently
+            drop JS-set `Accept-Language`) can still pick a non-system
+            mail language. Empty / malformed values fall back to the
+            header, which in turn falls back to `en`.
     PublicAuthSendEmailCodeResponse:
       type: object
       additionalProperties: false
@@ -2509,6 +2600,7 @@ components:
         - enrollment_ends_at
         - created_at
         - updated_at
+        - current_turn
       properties:
         game_id:
           type: string
@@ -2557,6 +2649,13 @@ components:
         updated_at:
           type: string
           format: date-time
+        current_turn:
+          type: integer
+          description: |
+            Most recent turn number observed by backend's runtime
+            projection. Zero before the engine produces its first
+            snapshot. The user surface uses it to fetch the matching
+            `user.games.report` without a separate state query.
     GameSummaryPage:
       type: object
       additionalProperties: false
@@ -2714,7 +2813,6 @@ components:
             - target_engine_version
             - start_gap_hours
             - start_gap_players
-            - current_turn
             - runtime_status
           properties:
             visibility:
@@ -2730,8 +2828,6 @@ components:
               type: integer
             start_gap_players:
               type: integer
-            current_turn:
-              type: integer
             runtime_status:
               type: string
             engine_health:

client/world/README.md

@@ -1,5 +1,12 @@
 # World rendering package
 
+> **Deprecated.** This package belongs to the deprecated
+> `galaxy/client` Fyne client. New code must not import it. The
+> active map renderer lives in `ui/frontend/src/map/` (TypeScript
+> + PixiJS), with its specification in `ui/docs/renderer.md`. The
+> sources here remain for historical context only and are not the
+> reference algorithm for the new renderer.
+
 ## Purpose
 
 `world` is the client-side map model and renderer for a 2D world that normally

docs/ARCHITECTURE.md

@@ -145,6 +145,15 @@ because they cross domain boundaries:
   `X-User-ID`. Public games carry `owner_user_id IS NULL`; the partial
   index on `(owner_user_id) WHERE visibility = 'private'` keeps the
   private-owner lookup efficient.
+- **Authenticated lobby commands** flow through the gateway envelope
+  by `message_type`. The catalog is `lobby.my.games.list`,
+  `lobby.public.games.list`, `lobby.my.applications.list`,
+  `lobby.my.invites.list`, `lobby.game.create`,
+  `lobby.game.open-enrollment`, `lobby.application.submit`,
+  `lobby.invite.redeem`, and `lobby.invite.decline`. Each lands on a
+  REST handler under `/api/v1/user/lobby/*`; the gateway forces
+  visibility to `private` on `lobby.game.create` before forwarding,
+  matching the user-surface invariant above.
 
 | Package                          | Responsibility                                                                                                                                                          |
 | -------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
@@ -362,11 +371,15 @@ Authenticated client traffic for in-game operations crosses three
 serialisation boundaries: signed-gRPC FlatBuffers (client ↔ gateway),
 JSON over REST (gateway ↔ backend), and JSON over REST again
 (backend ↔ engine). Gateway owns the FB ↔ JSON transcoding for the
-three message types `user.games.command`, `user.games.order`,
-`user.games.report` (FB schemas in `pkg/schema/fbs/{order,report}`,
-encoders in `pkg/transcoder`). Backend never touches FlatBuffers and
-never re-interprets the JSON beyond rebinding the actor field from
-the runtime player mapping (clients never carry a trusted actor).
+four message types `user.games.command`, `user.games.order`,
+`user.games.order.get`, `user.games.report` (FB schemas in
+`pkg/schema/fbs/{order,report}`, encoders in `pkg/transcoder`).
+`user.games.order.get` reads back the player's stored order for a
+given turn — paired with the POST `user.games.order` so the client
+can hydrate its local draft after a cache loss without re-deriving
+from the report. Backend never touches FlatBuffers and never
+re-interprets the JSON beyond rebinding the actor field from the
+runtime player mapping (clients never carry a trusted actor).
 
 Container state is owned by `backend/internal/runtime`:
 
@@ -531,6 +544,15 @@ This section describes the secure exchange model between client and
 gateway. It applies at the public boundary and does not rely on backend
 behaviour for any of its guarantees.
 
+The authenticated edge listener is built on `connectrpc.com/connect` and
+natively serves the Connect, gRPC, and gRPC-Web protocols on a single
+HTTP/2 cleartext (`h2c`) port. Browser clients use Connect via
+`@connectrpc/connect-web`; native iOS / Android / desktop clients can
+use either Connect or raw gRPC framing against the same listener.
+Envelope, signature, freshness, and anti-replay rules below are
+protocol-agnostic — they apply identically to every supported wire
+framing.
+
 ### Principles
 
 - No browser cookies.
@@ -563,7 +585,9 @@ and revoke metadata.
   the device.
 - Browser/WASM clients use WebCrypto with non-exportable storage where
   available. Loss of browser storage is acceptable and is recovered by
-  re-login.
+  re-login. The concrete browser baseline, IndexedDB schema, and
+  keystore lifecycle live in
+  [`ui/docs/storage.md`](../ui/docs/storage.md).
 
 ### Request envelope
 
@@ -761,9 +785,21 @@ Future scale-out hooks (not in MVP):
 - **runtime snapshot** — engine-status read materialised into the lobby's
   denormalised view: `current_turn`, `runtime_status`,
   `engine_health_summary`, `player_turn_stats`.
-- **turn cutoff** — the `running → generation_in_progress` CAS transition
-  that closes the command window. Commands arriving after the CAS are
-  rejected.
+- **turn cutoff** — the `running → generation_in_progress` runtime-status
+  flip performed by `backend/internal/runtime/scheduler.go` before each
+  engine `/admin/turn` call. Commands and orders arriving while the
+  flag is set are rejected by the user-games handlers with HTTP 409
+  `turn_already_closed`. The matching reopening flip
+  (`generation_in_progress → running`) happens on a successful tick;
+  a failing tick instead drives the lobby to `paused` and fans out
+  `game.paused` (FUNCTIONAL.md §6.3, §6.5).
+- **auto-pause** — the lobby reaction to a failed runtime snapshot
+  (`engine_unreachable` / `generation_failed`): the game flips
+  `running → paused`, the order handlers refuse new submits with
+  HTTP 409 `game_paused`, and `lobby.publishGamePaused` fans out the
+  push event. Only an admin `/resume` followed by a successful tick
+  recovers the game; the UI relies on the next `game.turn.ready` to
+  clear the paused banner.
 - **outbox** — the durable queue of pending mail rows in
   `mail_deliveries`, drained by the mail worker.
 - **freshness window** — the symmetric ±5-minute interval around server

docs/FUNCTIONAL.md

@@ -100,12 +100,15 @@ Branches inside backend:
   new one. The client gets the same response shape and is unaware of
   the reuse.
 - **Otherwise.** Backend creates a new challenge with the resolved
-  preferred language (derived from the optional `Accept-Language`
-  header forwarded by gateway, falling back to a default), and
-  enqueues the auth-mail row directly into the outbox in the same
-  transaction. SMTP delivery is asynchronous; the auth response
-  returns as soon as the challenge and outbox rows are durably
-  committed.
+  preferred language (derived from the optional `locale` body field
+  the caller sends — which takes priority — or, if absent or blank,
+  from the `Accept-Language` header forwarded by gateway, falling
+  back to a default), and enqueues the auth-mail row directly into
+  the outbox in the same transaction. SMTP delivery is asynchronous;
+  the auth response returns as soon as the challenge and outbox rows
+  are durably committed. The body field is the canonical channel
+  because Safari silently drops JS-set `Accept-Language` headers;
+  non-Safari clients can still rely on the header alone.
 
 ### 1.3 Confirming the challenge
 
@@ -139,9 +142,10 @@ consumed exactly once.
 ### 1.4 Per-request session lookup
 
 Once the client holds a device session id and a private key, every
-authenticated call is a signed gRPC request to gateway. Gateway is the
-only component that ever sees the request signature; backend trusts
-gateway's verdict.
+authenticated call is a signed request to gateway over the
+authenticated edge listener (Connect / gRPC / gRPC-Web on a single
+HTTP/h2c port). Gateway is the only component that ever sees the
+request signature; backend trusts gateway's verdict.
 
 Gateway needs the session's public key to verify the signature, so each
 authenticated request resolves the device session through an in-memory
@@ -602,13 +606,16 @@ not duplicated here.
 
 ### 6.2 Backend's role: pass-through with authorisation
 
-The signed-gRPC pipeline for in-game traffic uses three message types
-on the authenticated surface — `user.games.command`,
-`user.games.order`, `user.games.report` — each with a typed
-FlatBuffers payload. Gateway transcodes the FB request into the JSON
-shape backend expects, forwards over plain REST to the corresponding
-`/api/v1/user/games/{game_id}/*` endpoint, then transcodes the JSON
-response back into FB before signing the reply.
+The signed authenticated-edge pipeline for in-game traffic uses four
+message types on the authenticated surface — `user.games.command`,
+`user.games.order`, `user.games.order.get`, `user.games.report` —
+each with a typed FlatBuffers payload. Gateway transcodes the FB
+request into the JSON shape backend expects, forwards over plain
+REST to the corresponding `/api/v1/user/games/{game_id}/*` endpoint,
+then transcodes the JSON response back into FB before signing the
+reply. `user.games.order.get` is the read-back companion to
+`user.games.order`: clients use it to hydrate the local order draft
+after a cache loss (fresh install, cleared storage, new device).
 
 For every in-game endpoint the user surface acts as an authorised
 pass-through to the engine container. Backend:
@@ -628,18 +635,40 @@ validity and ordering of in-game decisions. Gateway needs to know
 the typed FB shape only to transcode the wire format; the per-command
 semantics live in the engine.
 
-### 6.3 Turn cutoff
+### 6.3 Turn cutoff and auto-pause
 
 A running game continuously alternates between a command-accepting
-window and a generation phase. The transition `running →
-generation_in_progress` is the cutoff: any command or order that
-arrives after the cutoff is rejected by backend before forwarding,
-because the engine no longer accepts writes for the closing turn.
-After generation finishes, backend re-opens the window for the next
-turn.
+window and a generation phase, driven by the cron expression stored
+in `runtime_records.turn_schedule`. The backend scheduler
+(`backend/internal/runtime/scheduler.go`) wraps each engine
+`/admin/turn` call between two `runtime_status` flips:
+
+- Before the engine call: `running → generation_in_progress`.
+  The user-games command/order handlers
+  (`backend/internal/server/handlers_user_games.go`) consult the
+  per-game runtime record on every request and reject with
+  HTTP 409 + `code = turn_already_closed` while the runtime sits in
+  `generation_in_progress`. The error envelope mirrors backend's
+  standard `httperr` shape: `{"error": {"code":
+  "turn_already_closed", "message": "..."}}`.
+- After a successful tick: `generation_in_progress → running`.
+  The order window re-opens for the new turn and the next
+  scheduled tick continues normally.
+- After a failed tick (`engine_unreachable` /
+  `generation_failed`): the lobby's `OnRuntimeSnapshot` flips the
+  game from `running` to `paused` and publishes a `game.paused`
+  push event (see §6.6). The order handlers reject with HTTP 409
+  + `code = game_paused` until an admin resume succeeds.
 
 `force-next-turn` (admin) schedules a one-shot extra tick that
-advances the next scheduled turn by one cron step.
+advances the next scheduled turn by one cron step; the same
+status-flip and rejection rules apply.
+
+Clients distinguish the two rejections by `code`:
+`turn_already_closed` means "wait for the next `game.turn.ready`
+and resubmit", whereas `game_paused` means "wait for an admin
+resume". The web client implements both reactions in
+`ui/docs/sync-protocol.md`.
 
 ### 6.4 Reports
 
@@ -647,7 +676,79 @@ Per-turn reports are read-only views fetched from the engine on
 demand. Backend authorises the caller and forwards the request;
 there is no caching or denormalisation in this path.
 
-### 6.5 Side effects
+The web client renders the report as one section per FBS array
+(galaxy summary, votes, player status, my / foreign sciences, my /
+foreign ship classes, battles, bombings, approaching groups, my /
+foreign / uninhabited / unknown planets, ships in production,
+cargo routes, my fleets, my / foreign / unidentified ship groups).
+Empty sections render explicit empty-state copy. Section anchors
+are exposed in a sticky table of contents (a `<select>` on mobile)
+and the scroll position is preserved across active-view switches
+via SvelteKit's `Snapshot` API.
+
+The Bombings section is a flat read-only table — one row per
+bombing event, columns for `attacker`, `attack_power`, `wiped`
+state and the post-bombing resource snapshot. The Battles section
+is a list of links into the Battle Viewer (see [§6.5](#65-battle-viewer)).
+
+### 6.5 Battle viewer
+
+The Battle Viewer is a dedicated view that replaces the map and
+renders one battle at a time. Entry points:
+
+- A row in the Reports view's Battles section (link with the
+  current turn pinned via `?turn=`).
+- A battle marker on the map (yellow cross drawn through the
+  corners of the square that circumscribes the planet circle;
+  stroke width scales with the protocol length).
+
+The viewer is a logically isolated component that consumes a
+`BattleReport` (shape per `pkg/model/report/battle.go`). The page
+loader (`ui/frontend/src/lib/active-view/battle.svelte`) fetches
+the report through the backend gateway route
+`GET /api/v1/user/games/{game_id}/battles/{turn}/{battle_id}`,
+which forwards verbatim to the engine's
+`GET /api/v1/battle/:turn/:uuid`.
+
+Visual model is radial: the planet sits at the centre, races are
+placed at equal angular spacing on an outer ring, and each race is
+rendered as a cloud of ship-class circles arranged on a Vogel
+sunflower spiral biased toward the planet (the largest group by
+NumberLeft sits closest to the planet, lighter buckets fan behind).
+Tech-variants of the same `(race, className)` collapse into one
+visual bucket labelled `<className>:<numLeft>`; per-class detail
+stays available in the Reports view. Circle radius scales with
+per-ship FullMass (range `[6, 24] px`, per-battle normalisation)
+so heavy ships visually dominate. Observer groups (`inBattle:
+false`) are not drawn. Eliminated races drop out and the survivors
+re-spread on the next frame. The viewer is pinned to the viewport
+(scene grows, log scrolls internally) so no page-level scroll
+appears.
+
+Each frame is one protocol entry; the shot is drawn as a thin line
+from attacker to defender, red on `destroyed`, green otherwise.
+Continuous playback offers 1x / 2x / 4x speeds (400 / 200 / 100 ms
+per frame), plus play/pause, step ±, and rewind. The accessibility
+text protocol below the scene mirrors the same events line-by-line.
+
+Bombings and battles are intentionally not mixed: bombings remain a
+static table in the Reports view; the bombing marker on the map is
+a thin stroke-only ring around the planet (yellow when damaged, red
+when wiped) and a click scrolls the corresponding row into view.
+
+The current report wire carries a `battle: [{ id, planet, shots }]`
+summary per battle so the map markers know where to anchor without
+fetching every full `BattleReport`.
+
+For DEV / e2e the legacy-report CLI
+(`tools/local-dev/legacy-report/cmd/legacy-report-to-json`) emits an
+envelope `{version: 1, report, battles}` where `battles` carries the
+full `BattleReport`-s parsed out of legacy `Battle at (#N)` blocks.
+The synthetic-report loader on the lobby unwraps the envelope and
+hands every battle to `registerSyntheticBattle`, so the Battle Viewer
+resolves any UUID without a network fetch.
+
+### 6.6 Side effects
 
 A successful turn generation publishes a runtime snapshot into the
 lobby module, which updates the denormalised view (current turn,
@@ -655,15 +756,32 @@ runtime status, per-player stats). The engine's "game finished"
 report drives the `running → finished` transition ([Section 3.5](#35-cancellation-and-finish))
 and triggers Race Name Directory promotions ([Section 5](#5-race-name-directory)).
 
-The `game.*` notification kinds (`game.started`, `game.turn.ready`,
-`game.generation.failed`, `game.finished`) are reserved in the
-documentation but have **no producer** in the codebase today; the
-notification catalog explicitly omits them (`backend/internal/notification/catalog.go`).
-Adding a producer is purely additive: register the kind in the
-catalog, populate `MailTemplateID` if email fan-out is desired, and
-have the appropriate domain module call `notification.Submit`.
+Among the `game.*` notification kinds, `game.turn.ready` and
+`game.paused` are wired:
 
-### 6.6 Cross-references
+- `game.turn.ready` —
+  `lobby.Service.OnRuntimeSnapshot` (`backend/internal/lobby/runtime_hooks.go`)
+  emits one intent per advancing `current_turn`, addressed to every
+  active membership of the game, with idempotency key
+  `turn-ready:<game_id>:<turn>` and JSON payload `{game_id, turn}`.
+- `game.paused` — the same hook publishes one intent per transition
+  into `paused` driven by an `engine_unreachable` /
+  `generation_failed` runtime snapshot, addressed to every active
+  membership, with idempotency key `paused:<game_id>:<turn>` and
+  JSON payload `{game_id, turn, reason}`. The runtime status that
+  triggered the transition is carried as `reason` so the UI can
+  differentiate the copy in a future revision.
+
+Both kinds route through the push channel only; email is
+deliberately omitted to avoid per-turn / per-pause spam.
+
+The remaining `game.*` kinds (`game.started`, `game.generation.failed`,
+`game.finished`) and `mail.dead_lettered` are reserved without a
+producer; adding one is purely additive (register the kind in the
+catalog, extend the migration `CHECK` constraint, and call
+`notification.Submit` from the appropriate domain module).
+
+### 6.7 Cross-references
 
 - Backend ↔ engine wire contract (`pkg/model/{order,report,rest}`):
   [ARCHITECTURE.md §9](ARCHITECTURE.md#9-backend--game-engine-communication).
@@ -680,9 +798,10 @@ session invalidations).
 
 ### 7.1 Scope
 
-In scope: the gRPC stream a client opens against gateway, the
-bootstrap event, the framing of forwarded events, and the
-backend → gateway control channel that produces those events.
+In scope: the server-streaming subscription a client opens against
+gateway (Connect / gRPC / gRPC-Web framing all map to the same
+endpoint), the bootstrap event, the framing of forwarded events, and
+the backend → gateway control channel that produces those events.
 
 Out of scope: the catalog of event kinds — see [Section 8](#8-notifications-and-mail) for the
 notification side and [`backend/README.md` §10](../backend/README.md#10-notification-catalog) for the closed list.

docs/FUNCTIONAL_ru.md

@@ -99,11 +99,15 @@ Backend выпускает непрозрачный идентификатор
   backend переиспользует последний имеющийся вызов вместо создания
   нового. Клиент получает ту же форму ответа и не знает о повторе.
 - **Иначе.** Backend создаёт новый вызов с разрешённым preferred_language
-  (выводится из опционального заголовка `Accept-Language`,
-  форварднутого gateway, с откатом на дефолт) и в той же транзакции
-  ставит auth-mail-строку прямо в outbox. SMTP-доставка асинхронна;
-  auth-ответ возвращается, как только строки challenge и outbox
-  durably закоммитены.
+  (выводится из опционального поля `locale` в JSON-теле — оно имеет
+  приоритет — либо, если оно отсутствует или пустое, из заголовка
+  `Accept-Language`, форварднутого gateway, с откатом на дефолт) и
+  в той же транзакции ставит auth-mail-строку прямо в outbox.
+  SMTP-доставка асинхронна; auth-ответ возвращается, как только
+  строки challenge и outbox durably закоммитены. Поле в теле — это
+  канонический канал, потому что Safari молча сбрасывает выставляемые
+  из JS заголовки `Accept-Language`; клиентам не на Safari достаточно
+  одного заголовка.
 
 ### 1.3 Подтверждение вызова
 
@@ -138,9 +142,10 @@ Throttle-переиспользование на стороне send означ
 ### 1.4 Поиск сессии для каждого запроса
 
 Когда у клиента есть идентификатор устройства-сессии и приватный ключ,
-каждый аутентифицированный вызов — это подписанный gRPC-запрос к
-gateway. Gateway — единственный компонент, который видит подпись
-запроса; backend доверяет вердикту gateway.
+каждый аутентифицированный вызов — это подписанный запрос к gateway
+по аутентифицированному edge-листенеру (Connect / gRPC / gRPC-Web на
+одном HTTP/h2c-порту). Gateway — единственный компонент, который видит
+подпись запроса; backend доверяет вердикту gateway.
 
 Gateway нужен публичный ключ сессии для проверки подписи, поэтому
 каждый аутентифицированный запрос разрешает устройство-сессию через
@@ -618,13 +623,18 @@ Wire-формат команд, приказов и отчётов — собс
 
 ### 6.2 Роль backend: pass-through с авторизацией
 
-Signed-gRPC-конвейер для in-game-трафика использует три message
-types на аутентифицированной поверхности — `user.games.command`,
-`user.games.order`, `user.games.report` — у каждого типизированный
-FlatBuffers-payload. Gateway транскодирует FB-запрос в JSON-форму,
-которую ждёт backend, форвардит её REST'ом в соответствующий
+Подписанный конвейер аутентифицированного edge для in-game-трафика
+использует четыре message types на аутентифицированной поверхности —
+`user.games.command`, `user.games.order`, `user.games.order.get`,
+`user.games.report` — у каждого типизированный FlatBuffers-payload.
+Gateway транскодирует FB-запрос в JSON-форму, которую ждёт backend,
+форвардит её REST'ом в соответствующий
 `/api/v1/user/games/{game_id}/*` endpoint, после чего транскодирует
 JSON-ответ обратно в FB перед подписью.
+`user.games.order.get` — read-back-компаньон для `user.games.order`:
+клиент использует его, чтобы восстановить локальный черновик приказа
+после потери кэша (свежая установка, очищенное хранилище, новое
+устройство).
 
 Для каждого in-game-endpoint user-surface работает как
 авторизующий pass-through к engine-контейнеру. Backend:
@@ -643,17 +653,40 @@ Backend не парсит содержимое payload команд или пр
 FB-форму только чтобы транскодировать wire-формат; per-command-
 семантика живёт в движке.
 
-### 6.3 Окно хода
+### 6.3 Окно хода и auto-pause
 
 Запущенная игра постоянно чередуется между окном приёма команд
-и фазой генерации. Переход `running → generation_in_progress` —
-cutoff: любая команда или приказ, пришедшие после cutoff,
-отклоняются backend до форварда, потому что движок больше не
-принимает запись для закрывающегося хода. После окончания
-генерации backend заново открывает окно для следующего хода.
+и фазой генерации, управляемой cron-выражением из
+`runtime_records.turn_schedule`. Backend-планировщик
+(`backend/internal/runtime/scheduler.go`) оборачивает каждый
+engine `/admin/turn` двумя `runtime_status`-флипами:
+
+- Перед engine-вызовом: `running → generation_in_progress`.
+  User-games-handler'ы команд/приказов
+  (`backend/internal/server/handlers_user_games.go`) на каждом
+  запросе сверяются с per-game runtime-записью и отклоняют с
+  HTTP 409 + `code = turn_already_closed`, пока runtime в
+  `generation_in_progress`. Тело ошибки — стандартный
+  `httperr`-конверт: `{"error": {"code": "turn_already_closed",
+  "message": "..."}}`.
+- После успешного тика: `generation_in_progress → running`.
+  Окно приказов открывается на новый ход, следующий тик идёт
+  как обычно.
+- После провалившегося тика (`engine_unreachable` /
+  `generation_failed`): `lobby.OnRuntimeSnapshot` переводит игру
+  `running → paused` и публикует push-эвент `game.paused`
+  (см. §6.6). Order-handler'ы отклоняют запросы с HTTP 409 +
+  `code = game_paused`, пока админ не выполнит resume.
 
 `force-next-turn` (admin) планирует one-shot-доп-тик, который
-сдвигает следующий запланированный ход на один cron-шаг.
+сдвигает следующий запланированный ход на один cron-шаг; те же
+правила status-flip и отклонения применимы.
+
+Клиенты различают два варианта отказа по `code`:
+`turn_already_closed` — «дождись следующего `game.turn.ready` и
+отправь ещё раз», `game_paused` — «дождись resume администратором».
+Web-клиент реализует оба сценария согласно
+`ui/docs/sync-protocol.md`.
 
 ### 6.4 Отчёты
 
@@ -661,7 +694,79 @@ Per-turn-отчёты — read-only-вью, забираемые из движк
 Backend авторизует вызывающего и форвардит запрос; в этом пути
 нет ни кэширования, ни денормализации.
 
-### 6.5 Побочные эффекты
+Web-клиент рендерит отчёт как одну секцию на каждый FBS-массив
+(общие сведения, голоса, статус игроков, мои / чужие науки, мои /
+чужие классы кораблей, сражения, бомбардировки, приближающиеся
+группы, мои / чужие / необитаемые / неопознанные планеты, корабли в
+производстве, грузовые маршруты, мои флоты, мои / чужие /
+неопознанные группы кораблей). Пустые секции получают явную копию
+empty-state. Якоря секций отображены в sticky-TOC (на мобильном —
+`<select>`); позиция скролла сохраняется при переключении активного
+представления через SvelteKit `Snapshot` API.
+
+Секция бомбардировок — это плоская read-only-таблица: одна строка на
+событие, колонки `attacker`, `attack_power`, признак `wiped` и
+ресурсный снимок после удара. Секция сражений — список ссылок в
+Battle Viewer (см. [§6.5](#65-battle-viewer)).
+
+### 6.5 Battle viewer
+
+Battle Viewer — отдельное представление, заменяющее карту и
+показывающее одну битву. Входы:
+
+- Строка в секции «сражения» в Reports (ссылка с пиннингом
+  текущего хода через `?turn=`).
+- Battle-marker на карте (жёлтый крест через противоположные углы
+  квадрата, описанного вокруг круга планеты; толщина линий растёт
+  с длиной протокола).
+
+Сам Viewer — логически изолированный компонент, потребляющий
+`BattleReport` в форме `pkg/model/report/battle.go`. Страница-обёртка
+(`ui/frontend/src/lib/active-view/battle.svelte`) забирает отчёт
+через backend-маршрут
+`GET /api/v1/user/games/{game_id}/battles/{turn}/{battle_id}`,
+который проксирует ответ engine-эндпоинта
+`GET /api/v1/battle/:turn/:uuid`.
+
+Визуальная модель — радиальная: планета в центре, расы по внешней
+окружности на равных угловых интервалах, внутри расы — облако
+кружков по классам кораблей, выложенное Vogel-спиралью с биасом к
+планете (самая многочисленная группа по NumberLeft — ближе к
+планете, остальные раскручиваются спиралью позади). Tech-варианты
+одного `(race, className)` схлопываются в один визуальный нод
+`<className>:<numLeft>`; детали по тех-уровням остаются в Reports.
+Радиус кружка масштабируется по FullMass корабля (диапазон
+`[6, 24] px`, нормировка на самую тяжёлую группу в битве), так что
+тяжёлые корабли визуально доминируют. Наблюдатели (`inBattle:
+false`) не рисуются. Выбывшие расы убираются из сцены, оставшиеся
+перераспределяются на следующем кадре. Viewer закреплён по высоте
+viewport-а: сцена растягивается, лог скроллит внутри — никаких
+скроллов на уровне страницы.
+
+Каждый кадр — одна запись протокола; выстрел рисуется тонкой линией
+от атакующего к защитнику, красной при `destroyed`, зелёной иначе.
+Непрерывное воспроизведение: 1x / 2x / 4x (400 / 200 / 100 мс на
+кадр), плюс play/pause, шаг вперёд/назад, rewind. Текстовый протокол
+доступности под сценой дублирует те же события построчно.
+
+Бомбардировки и сражения умышленно не смешиваются: бомбардировки
+остаются статической таблицей в Reports; bombing-marker на карте —
+тонкая окружность вокруг планеты (жёлтая при damaged, красная при
+wiped), клик скроллит соответствующую строку в Reports.
+
+Текущая wire-форма отчёта несёт `battle: [{ id, planet, shots }]`
+на каждую битву, чтобы map-маркеры могли расположиться без
+дополнительного запроса полного `BattleReport`.
+
+Для DEV / e2e легаси-CLI
+(`tools/local-dev/legacy-report/cmd/legacy-report-to-json`) выдаёт
+envelope `{version: 1, report, battles}`, где `battles` несёт полные
+`BattleReport`-ы, распарсенные из `Battle at (#N)`-блоков. Synthetic-
+загрузчик в лобби разбирает envelope и регистрирует каждую битву
+через `registerSyntheticBattle`, так что Battle Viewer открывает
+любой UUID без сетевого запроса.
+
+### 6.6 Побочные эффекты
 
 Успешная генерация хода публикует runtime-snapshot в lobby-модуль,
 который обновляет денормализованное вью (текущий ход, runtime-
@@ -670,16 +775,34 @@ status, per-player-stats). Engine-отчёт "game finished" гонит
 ([Раздел 3.5](#35-отмена-и-завершение)) и триггерит Race Name
 Directory-промоушен ([Раздел 5](#5-реестр-названий-рас)).
 
-`game.*`-виды уведомлений (`game.started`, `game.turn.ready`,
-`game.generation.failed`, `game.finished`) зарезервированы в
-документации, но **не имеют поставщика** в кодовой базе сегодня;
-notification-каталог явно их опускает
-(`backend/internal/notification/catalog.go`). Добавление поставщика
-аддитивно: зарегистрировать вид в каталоге, заполнить
-`MailTemplateID`, если нужен email-веер, и заставить нужный
-доменный модуль вызвать `notification.Submit`.
+Из `game.*`-видов уведомлений подключены `game.turn.ready` и
+`game.paused`:
 
-### 6.6 Перекрёстные ссылки
+- `game.turn.ready` —
+  `lobby.Service.OnRuntimeSnapshot` (`backend/internal/lobby/runtime_hooks.go`)
+  выпускает один intent на каждое увеличение `current_turn`,
+  адресуя его всем активным membership-ам игры, с
+  idempotency-ключом `turn-ready:<game_id>:<turn>` и
+  JSON-payload-ом `{game_id, turn}`.
+- `game.paused` — тот же хук публикует один intent на каждое
+  выставление статуса `paused` по runtime-снапшоту
+  (`engine_unreachable` / `generation_failed`), адресуя его всем
+  активным membership-ам игры, с idempotency-ключом
+  `paused:<game_id>:<turn>` и JSON-payload-ом
+  `{game_id, turn, reason}`. `reason` несёт runtime-статус,
+  спровоцировавший переход, чтобы UI смог в будущем
+  дифференцировать копию.
+
+Оба вида направляются только в push-канал; email-фан-аут
+сознательно опущен, чтобы избежать спама на каждом ходе/паузе.
+
+Остальные `game.*`-виды (`game.started`, `game.generation.failed`,
+`game.finished`) и `mail.dead_lettered` зарезервированы без поставщика;
+добавление поставщика чисто аддитивное (зарегистрировать вид в
+каталоге, расширить `CHECK`-констрейнт миграции и вызвать
+`notification.Submit` из подходящего доменного модуля).
+
+### 6.7 Перекрёстные ссылки
 
 - Backend ↔ engine wire-контракт (`pkg/model/{order,report,rest}`):
   [ARCHITECTURE.md §9](ARCHITECTURE.md#9-backend--game-engine-communication).
@@ -697,9 +820,10 @@ notification-каталог явно их опускает
 
 ### 7.1 Состав
 
-В составе: gRPC-стрим, который клиент открывает к gateway,
-bootstrap-событие, фрейминг форварднутых событий, control-канал
-backend → gateway, который производит эти события.
+В составе: server-streaming-подписка, которую клиент открывает к
+gateway (Connect / gRPC / gRPC-Web фреймы все маршрутизируются на
+одну точку), bootstrap-событие, фрейминг форварднутых событий,
+control-канал backend → gateway, который производит эти события.
 
 Вне состава: каталог видов событий — см.
 [Раздел 8](#8-уведомления-и-почта) для notification-стороны и

game/.gitignore

@@ -0,0 +1 @@
+artifacts/

game/README.md

@@ -49,6 +49,7 @@ described below. Endpoints split into two route classes:
 | Admin (GM-only) | `POST /api/v1/admin/race/banish` | `Game Master` | Deactivate a race after a permanent platform removal. |
 | Player | `PUT /api/v1/command` | `Game Master` (forwarded from `Edge Gateway`) | Execute a batch of player commands. |
 | Player | `PUT /api/v1/order` | `Game Master` | Validate and store a batch of player orders. |
+| Player | `GET /api/v1/order` | `Game Master` | Fetch the previously stored player order for a turn. |
 | Player | `GET /api/v1/report` | `Game Master` | Fetch the per-player turn report. |
 | Probe | `GET /healthz` | `Runtime Manager` | Technical liveness probe. |
 

game/internal/controller/battle_test.go

@@ -8,6 +8,7 @@ import (
 	"galaxy/calc"
 	"galaxy/game/internal/controller"
 	"galaxy/game/internal/model/game"
+	"galaxy/model/report"
 
 	"github.com/stretchr/testify/assert"
 )
@@ -184,3 +185,89 @@ func TestProduceBattles(t *testing.T) {
 		assert.Zero(t, c.ShipGroup(3).Number)
 	}
 }
+
+// TestTransformBattleAggregatesSameShipClass guards against the
+// engine-side variant of the duplicate-class bug. Several ShipGroups
+// of the same ShipClass.ID can take part in the same battle (arrivals
+// from different planets, tech splits, etc.); they must collapse into
+// a single BattleReportGroup with summed Number and NumberLeft. The
+// pre-fix engine cached the first group's index and silently dropped
+// every subsequent group's initial / survivor counts, which manifested
+// downstream as more Destroyed shots in the protocol than the
+// recorded initial roster could account for.
+func TestTransformBattleAggregatesSameShipClass(t *testing.T) {
+	c, g := newCache()
+
+	assert.NoError(t, g.RaceRelation(Race_0.Name, Race_1.Name, game.RelationWar.String()))
+	assert.NoError(t, g.RaceRelation(Race_1.Name, Race_0.Name, game.RelationWar.String()))
+
+	// Two Race_0 groups of the SAME ship class (Race_0_Gunship) plus
+	// one Race_1 group of Race_1_Gunship — all parked on Planet_0
+	// (owned by Race_0; the Race_1 group lands there via the Unsafe
+	// helper that bypasses the ownership check). Group indices land
+	// at 0, 1, 2 in creation order.
+	assert.NoError(t, c.CreateShips(Race_0_idx, Race_0_Gunship, R0_Planet_0_num, 10))
+	assert.NoError(t, c.CreateShips(Race_0_idx, Race_0_Gunship, R0_Planet_0_num, 10))
+	c.CreateShipsUnsafe_T(Race_1_idx, c.MustShipClass(Race_1_idx, Race_1_Gunship).ID, R0_Planet_0_num, 5)
+
+	// Simulate post-battle survivor counts: Group 0 ended the battle
+	// with 8 ships, Group 1 with 6. The aggregated BattleReportGroup
+	// must report NumberLeft = 8 + 6 = 14 (not just the last cached
+	// group's 6 — that's the regression).
+	c.ShipGroup(0).Number = 8
+	c.ShipGroup(1).Number = 6
+
+	b := &controller.Battle{
+		Planet:         R0_Planet_0_num,
+		ObserverGroups: map[int]bool{0: true, 1: true, 2: true},
+		InitialNumbers: map[int]uint{0: 10, 1: 10, 2: 5},
+		// Protocol must reference every in-battle group at least once
+		// (otherwise TransformBattle won't register it through the
+		// `ship()` path). Two shots from Race_1 against each Race_0
+		// group hits both groupIds.
+		Protocol: []controller.BattleAction{
+			{Attacker: 2, Defender: 0, Destroyed: true},
+			{Attacker: 2, Defender: 1, Destroyed: true},
+		},
+	}
+
+	r := controller.TransformBattle(c, b)
+
+	// Two BattleReportGroup entries total: one merged Race_0_Gunship
+	// (groups 0 + 1) and one Race_1_Gunship. NOT three.
+	if got, want := len(r.Ships), 2; got != want {
+		t.Fatalf("len(r.Ships) = %d, want %d (duplicate ShipClass.ID must merge)", got, want)
+	}
+
+	var gunship0, gunship1 *report.BattleReportGroup
+	for i := range r.Ships {
+		grp := r.Ships[i]
+		switch grp.Race {
+		case Race_0.Name:
+			gunship0 = &grp
+		case Race_1.Name:
+			gunship1 = &grp
+		}
+	}
+	if gunship0 == nil || gunship1 == nil {
+		t.Fatalf("missing race entry: race0=%v race1=%v", gunship0, gunship1)
+	}
+
+	if gunship0.ClassName != Race_0_Gunship {
+		t.Errorf("race0.ClassName = %q, want %q", gunship0.ClassName, Race_0_Gunship)
+	}
+	if gunship0.Number != 20 {
+		t.Errorf("race0.Number = %d, want 20 (10+10)", gunship0.Number)
+	}
+	if gunship0.NumberLeft != 14 {
+		t.Errorf("race0.NumberLeft = %d, want 14 (8+6)", gunship0.NumberLeft)
+	}
+	if !gunship0.InBattle {
+		t.Errorf("race0.InBattle = false, want true (both source groups were in-battle)")
+	}
+
+	if gunship1.Number != 5 || gunship1.NumberLeft != 5 {
+		t.Errorf("race1 = (Number=%d, NumberLeft=%d), want (5, 5)",
+			gunship1.Number, gunship1.NumberLeft)
+	}
+}

game/internal/controller/battle_transform.go

@@ -18,10 +18,35 @@ func TransformBattle(c *Cache, b *Battle) *report.BattleReport {
 
 	cacheShipClass := make(map[uuid.UUID]int)
 	cacheRaceName := make(map[uuid.UUID]int)
+	processedGroup := make(map[int]bool)
 
 	addShipGroup := func(groupId int, inBattle bool) int {
 		shipClass := c.ShipGroupShipClass(groupId)
 		sg := c.ShipGroup(groupId)
+		// Several ship-groups of the same race/class can take part
+		// in the same battle (different tech upgrades, arrivals from
+		// different planets, …). They share a single
+		// BattleReportGroup entry keyed by ShipClass.ID — when a
+		// later group lands on a cached class we add its Number and
+		// NumberLeft into the existing entry instead of dropping
+		// them, so the protocol's per-class destroy counts reconcile
+		// with the recorded totals. `processedGroup` guards against
+		// double-counting a single groupId across multiple shots in
+		// the protocol — `ship()` runs on every attacker and defender
+		// reference, the merge must happen once per groupId.
+		if existing, ok := cacheShipClass[shipClass.ID]; ok {
+			if !processedGroup[groupId] {
+				bg := r.Ships[existing]
+				bg.Number += b.InitialNumbers[groupId]
+				bg.NumberLeft += sg.Number
+				if inBattle {
+					bg.InBattle = true
+				}
+				r.Ships[existing] = bg
+				processedGroup[groupId] = true
+			}
+			return existing
+		}
 		itemNumber := len(r.Ships)
 		bg := &report.BattleReportGroup{
 			Race:         c.g.Race[c.RaceIndex(sg.OwnerID)].Name,
@@ -31,22 +56,19 @@ func TransformBattle(c *Cache, b *Battle) *report.BattleReport {
 			ClassName:    shipClass.Name,
 			LoadType:     sg.CargoString(),
 			LoadQuantity: report.F(sg.Load.F()),
+			Tech:         make(map[string]report.Float, len(sg.Tech)),
 		}
 		for t, v := range sg.Tech {
 			bg.Tech[t.String()] = report.F(v.F())
 		}
 		r.Ships[itemNumber] = *bg
 		cacheShipClass[shipClass.ID] = itemNumber
+		processedGroup[groupId] = true
 		return itemNumber
 	}
 
 	ship := func(groupId int) int {
-		shipClass := c.ShipGroupShipClass(groupId)
-		if v, ok := cacheShipClass[shipClass.ID]; ok {
-			return v
-		} else {
-			return addShipGroup(groupId, true)
-		}
+		return addShipGroup(groupId, true)
 	}
 
 	race := func(groupId int) int {

game/internal/controller/controller.go

@@ -2,6 +2,7 @@ package controller
 
 import (
 	"errors"
+	"time"
 
 	"galaxy/game/internal/model/game"
 
@@ -37,6 +38,10 @@ type Repo interface {
 	// SaveBattle stores a new battle protocol and battle meta data for turn t
 	SaveBattle(uint, *report.BattleReport, *game.BattleMeta) error
 
+	// LoadBattle reads battle's protocol for turn t and battle id.
+	// Returns false if battle with such id was never stored at turn t
+	LoadBattle(t uint, id uuid.UUID) (*report.BattleReport, bool, error)
+
 	// SaveBombing stores all prodused bombings for turn t
 	SaveBombings(uint, []*game.Bombing) error
 
@@ -47,10 +52,10 @@ type Repo interface {
 	LoadReport(uint, uuid.UUID) (*report.Report, error)
 
 	// SaveOrder stores order for given turn
-	SaveOrder(uint, uuid.UUID, *order.Order) error
+	SaveOrder(uint, uuid.UUID, *order.UserGamesOrder) error
 
 	// LoadOrder loads order for specific turn and player id
-	LoadOrder(uint, uuid.UUID) (*order.Order, bool, error)
+	LoadOrder(uint, uuid.UUID) (*order.UserGamesOrder, bool, error)
 }
 
 type Ctrl interface {
@@ -126,14 +131,30 @@ func ExecuteCommand(configure func(*Param), consumer func(c Ctrl) error) (err er
 	return ec.executeCommand(func(c *Controller) error { return consumer(c) })
 }
 
-func ValidateOrder(configure func(*Param), actor string, cmd ...order.DecodableCommand) (err error) {
+func ValidateOrder(configure func(*Param), actor string, cmd ...order.DecodableCommand) (*order.UserGamesOrder, error) {
 	ec, err := NewRepoController(configure)
 	if err != nil {
-		return err
+		return nil, err
 	}
 	return ec.validateOrder(actor, cmd...)
 }
 
+func FetchOrder(configure func(*Param), actor string, turn uint) (order *order.UserGamesOrder, ok bool, err error) {
+	ec, err := NewRepoController(configure)
+	if err != nil {
+		return nil, false, err
+	}
+	return ec.fetchOrder(actor, turn)
+}
+
+func FetchBattle(configure func(*Param), turn uint, ID uuid.UUID) (b *report.BattleReport, exists bool, err error) {
+	ec, err := NewRepoController(configure)
+	if err != nil {
+		return nil, false, err
+	}
+	return ec.fetchBattle(turn, ID)
+}
+
 func BanishRace(configure func(*Param), actor string) error {
 	ec, err := NewRepoController(configure)
 	if err != nil {
@@ -213,8 +234,8 @@ func (ec *RepoController) NewGameController(g *game.Game) *Controller {
 	}
 }
 
-func (ec *RepoController) validateOrder(actor string, cmd ...order.DecodableCommand) (err error) {
-	return ec.executeSafe(func(t uint, c *Controller) error {
+func (ec *RepoController) validateOrder(actor string, cmd ...order.DecodableCommand) (o *order.UserGamesOrder, err error) {
+	err = ec.executeSafe(func(t uint, c *Controller) error {
 		id, err := c.RaceID(actor)
 		if err != nil {
 			return err
@@ -223,10 +244,41 @@ func (ec *RepoController) validateOrder(actor string, cmd ...order.DecodableComm
 		if err != nil {
 			return err
 		}
-		o := &order.Order{Commands: make([]order.DecodableCommand, len(cmd))}
+		o = &order.UserGamesOrder{
+			GameID:    c.Cache.g.ID,
+			UpdatedAt: time.Now().UTC().UnixMilli(),
+			Commands:  make([]order.DecodableCommand, len(cmd)),
+		}
 		copy(o.Commands, cmd)
 		return ec.Repo.SaveOrder(t, id, o)
 	})
+	if err != nil {
+		return nil, err
+	}
+	return
+}
+
+func (ec *RepoController) fetchOrder(actor string, turn uint) (order *order.UserGamesOrder, ok bool, err error) {
+	err = ec.executeSafe(func(t uint, c *Controller) error {
+		id, err := c.RaceID(actor)
+		if err != nil {
+			return err
+		}
+		order, ok, err = ec.Repo.LoadOrder(turn, id)
+		return err
+	})
+	if err != nil {
+		return
+	}
+	return
+}
+
+func (ec *RepoController) fetchBattle(turn uint, ID uuid.UUID) (order *report.BattleReport, exists bool, err error) {
+	err = ec.executeSafe(func(t uint, c *Controller) error {
+		order, exists, err = ec.Repo.LoadBattle(turn, ID)
+		return err
+	})
+	return
 }
 
 func (ec *RepoController) loadReport(actor string, turn uint) (r *report.Report, err error) {

game/internal/controller/fleet_send.go

@@ -1,8 +1,7 @@
 package controller
 
 import (
-	"galaxy/util"
-
+	"galaxy/calc"
 	e "galaxy/error"
 
 	"galaxy/game/internal/model/game"
@@ -25,7 +24,7 @@ func (c *Cache) FleetSend(ri, fi int, planetNumber uint) error {
 	if !ok {
 		return e.NewEntityNotExistsError("destination planet #%d", planetNumber)
 	}
-	rangeToDestination := util.ShortDistance(c.g.Map.Width, c.g.Map.Height, p1.X.F(), p1.Y.F(), p2.X.F(), p2.Y.F())
+	rangeToDestination := calc.ShortDistance(c.g.Map.Width, c.g.Map.Height, p1.X.F(), p1.Y.F(), p2.X.F(), p2.Y.F())
 	if rangeToDestination > c.g.Race[ri].FlightDistance() {
 		return e.NewSendUnreachableDestinationError("range=%.03f", rangeToDestination)
 	}

game/internal/controller/order.go

@@ -114,6 +114,7 @@ func (c *Controller) applyCommand(actor string, cmd order.DecodableCommand) (err
 
 func (c *Controller) applyOrders(t uint) error {
 	raceOrder := make(map[int][]order.DecodableCommand)
+	raceOrderUpdated := make(map[int]int64)
 	commandRace := make(map[string]string)
 	challenge := make(map[string]*order.CommandShipGroupUnload)
 	cmdApplied := make(map[string]bool)
@@ -127,6 +128,7 @@ func (c *Controller) applyOrders(t uint) error {
 			continue
 		}
 		raceOrder[ri] = o.Commands
+		raceOrderUpdated[ri] = o.UpdatedAt
 		for i := range o.Commands {
 			commandRace[o.Commands[i].CommandID()] = c.Cache.g.Race[ri].Name
 			if v, ok := order.AsCommand[*order.CommandShipGroupUnload](o.Commands[i]); ok {
@@ -156,10 +158,12 @@ func (c *Controller) applyOrders(t uint) error {
 			// any command might fail due to challenged planets colonization
 			_ = c.applyCommand(commandRace[cmd.CommandID()], cmd)
 		}
-	}
-
-	for ri := range c.Cache.listRaceActingIdx() {
-		if err := c.Repo.SaveOrder(t, c.Cache.g.Race[ri].ID, &order.Order{Commands: raceOrder[ri]}); err != nil {
+		// re-save order to persist possible changed commands result outcome
+		if err := c.Repo.SaveOrder(t, c.Cache.g.Race[ri].ID, &order.UserGamesOrder{
+			GameID:    c.Cache.g.ID,
+			UpdatedAt: raceOrderUpdated[ri],
+			Commands:  raceOrder[ri],
+		}); err != nil {
 			return err
 		}
 	}

game/internal/controller/planet.go

@@ -267,21 +267,20 @@ func (c *Cache) putMaterial(pn uint, v float64) {
 	c.MustPlanet(pn).Mat(v)
 }
 
+// ProduceShip returns number of ships with shipMass planet p can produce in one turn
 func ProduceShip(p *game.Planet, productionAvailable, shipMass float64) uint {
 	if productionAvailable <= 0 {
 		return 0
 	}
 	ships := uint(0)
 	pa := productionAvailable
-	PRODcost := calc.ShipProductionCost(shipMass)
-	var MATneed, MATfarm, totalCost float64
+	var MATneed, totalCost float64
 	for {
 		MATneed = shipMass - float64(p.Material)
 		if MATneed < 0 {
 			MATneed = 0
 		}
-		MATfarm = MATneed / float64(p.Resources)
-		totalCost = PRODcost + MATfarm
+		totalCost = calc.ShipBuildCost(shipMass, float64(p.Material), float64(p.Resources))
 		if pa < totalCost {
 			progress := pa / totalCost
 			pval := game.F(progress)

game/internal/controller/report.go

@@ -9,8 +9,6 @@ import (
 	"galaxy/calc"
 	mr "galaxy/model/report"
 
-	"galaxy/util"
-
 	"galaxy/game/internal/model/game"
 
 	"github.com/google/uuid"
@@ -39,7 +37,7 @@ func (c *Cache) InitReport(t uint) *mr.Report {
 		OtherScience:           make([]mr.OtherScience, 0, 10),
 		LocalShipClass:         make([]mr.ShipClass, 0, 20),
 		OtherShipClass:         make([]mr.OthersShipClass, 0, 50),
-		Battle:                 make([]uuid.UUID, 0, 10),
+		Battle:                 make([]mr.BattleSummary, 0, 10),
 		Bombing:                make([]*mr.Bombing, 0, 10),
 		IncomingGroup:          make([]mr.IncomingGroup, 0, 10),
 		OnPlanetGroupCache:     make(map[uint][]int),
@@ -94,7 +92,7 @@ func (c *Cache) InitReport(t uint) *mr.Report {
 			}
 			for pi := range c.g.Map.Planet {
 				p2 := &c.g.Map.Planet[pi]
-				distance := util.ShortDistance(c.g.Map.Width, c.g.Map.Height, sg.StateInSpace.X.F(), sg.StateInSpace.Y.F(), p2.X.F(), p2.Y.F())
+				distance := calc.ShortDistance(c.g.Map.Width, c.g.Map.Height, sg.StateInSpace.X.F(), sg.StateInSpace.Y.F(), p2.X.F(), p2.Y.F())
 				report.InSpaceGroupRangeCache[sgi][p2.Number] = distance
 			}
 		} else {
@@ -344,7 +342,11 @@ func (c *Cache) ReportBattle(ri int, rep *mr.Report, br []*mr.BattleReport) {
 		}
 
 		sliceIndexValidate(&rep.Battle, i)
-		rep.Battle[i] = br[bi].ID
+		rep.Battle[i] = mr.BattleSummary{
+			ID:     br[bi].ID,
+			Planet: br[bi].Planet,
+			Shots:  uint(len(br[bi].Protocol)),
+		}
 		i++
 	}
 }
@@ -396,7 +398,7 @@ func (c *Cache) ReportIncomingGroup(ri int, rep *mr.Report) {
 			continue
 		}
 
-		distance := util.ShortDistance(c.g.Map.Width, c.g.Map.Height, p1.X.F(), p1.Y.F(), p2.X.F(), p2.Y.F())
+		distance := calc.ShortDistance(c.g.Map.Width, c.g.Map.Height, p1.X.F(), p1.Y.F(), p2.X.F(), p2.Y.F())
 		var speed, mass float64
 		if sg.FleetID != nil {
 			speed, mass = c.FleetSpeedAndMass(c.MustFleetIndex(*sg.FleetID))
@@ -597,7 +599,7 @@ func (c *Cache) ReportLocalFleet(ri int, rep *mr.Report) {
 		if inSpace, ok := fleetState.InSpace(); ok {
 			rep.LocalFleet[i].Origin = &inSpace.Origin
 			p2 := c.MustPlanet(rep.LocalFleet[i].Destination)
-			rangeToDestination := mr.F(util.ShortDistance(c.g.Map.Width, c.g.Map.Height, inSpace.X.F(), inSpace.Y.F(), p2.X.F(), p2.Y.F()))
+			rangeToDestination := mr.F(calc.ShortDistance(c.g.Map.Width, c.g.Map.Height, inSpace.X.F(), inSpace.Y.F(), p2.X.F(), p2.Y.F()))
 			rep.LocalFleet[i].Range = &rangeToDestination
 		}
 		i++
@@ -726,7 +728,7 @@ func (c *Cache) otherGroup(v *mr.OtherGroup, sg *game.ShipGroup, st *game.ShipTy
 	if sg.State() == game.StateInSpace {
 		v.Origin = &sg.StateInSpace.Origin
 		p2 := c.MustPlanet(v.Destination)
-		rangeToDestination := mr.F(util.ShortDistance(c.g.Map.Width, c.g.Map.Height, sg.StateInSpace.X.F(), sg.StateInSpace.Y.F(), p2.X.F(), p2.Y.F()))
+		rangeToDestination := mr.F(calc.ShortDistance(c.g.Map.Width, c.g.Map.Height, sg.StateInSpace.X.F(), sg.StateInSpace.Y.F(), p2.X.F(), p2.Y.F()))
 		v.Range = &rangeToDestination
 	}
 	v.Speed = mr.F(sg.Speed(st))

game/internal/controller/route.go

@@ -8,7 +8,7 @@ import (
 	"math/rand/v2"
 	"slices"
 
-	"galaxy/util"
+	"galaxy/calc"
 
 	e "galaxy/error"
 
@@ -28,7 +28,7 @@ func (c *Cache) PlanetRouteSet(ri int, rt game.RouteType, origin, destination ui
 	if !ok {
 		return e.NewEntityNotExistsError("destination planet #%d", destination)
 	}
-	rangeToDestination := util.ShortDistance(c.g.Map.Width, c.g.Map.Height, p1.X.F(), p1.Y.F(), p2.X.F(), p2.Y.F())
+	rangeToDestination := calc.ShortDistance(c.g.Map.Width, c.g.Map.Height, p1.X.F(), p1.Y.F(), p2.X.F(), p2.Y.F())
 	if rangeToDestination > c.g.Race[ri].FlightDistance() {
 		return e.NewSendUnreachableDestinationError("range=%.03f max=%.03f", rangeToDestination, c.g.Race[ri].FlightDistance())
 	}
@@ -194,7 +194,7 @@ func (c *Cache) RemoveUnreachableRoutes() {
 		ri := c.RaceIndex(*p1.Owner)
 		for rt, destination := range p1.Route {
 			p2 := c.MustPlanet(destination)
-			rangeToDestination := util.ShortDistance(c.g.Map.Width, c.g.Map.Height, p1.X.F(), p1.Y.F(), p2.X.F(), p2.Y.F())
+			rangeToDestination := calc.ShortDistance(c.g.Map.Width, c.g.Map.Height, p1.X.F(), p1.Y.F(), p2.X.F(), p2.Y.F())
 			if rangeToDestination > c.g.Race[ri].FlightDistance() {
 				delete(p1.Route, rt)
 			}

game/internal/controller/ship_group_send.go

@@ -1,8 +1,7 @@
 package controller
 
 import (
-	"galaxy/util"
-
+	"galaxy/calc"
 	e "galaxy/error"
 
 	"galaxy/game/internal/model/game"
@@ -47,7 +46,7 @@ func (c *Cache) shipGroupSend(ri int, groupID uuid.UUID, planetNumber uint) erro
 	if !ok {
 		return e.NewEntityNotExistsError("destination planet #%d", planetNumber)
 	}
-	rangeToDestination := util.ShortDistance(c.g.Map.Width, c.g.Map.Height, p1.X.F(), p1.Y.F(), p2.X.F(), p2.Y.F())
+	rangeToDestination := calc.ShortDistance(c.g.Map.Width, c.g.Map.Height, p1.X.F(), p1.Y.F(), p2.X.F(), p2.Y.F())
 	if rangeToDestination > c.g.Race[ri].FlightDistance() {
 		return e.NewSendUnreachableDestinationError("range=%.03f", rangeToDestination)
 	}

game/internal/controller/ship_group_upgrade.go

@@ -5,6 +5,7 @@ import (
 	"slices"
 	"strings"
 
+	"galaxy/calc"
 	e "galaxy/error"
 
 	"galaxy/game/internal/model/game"
@@ -156,26 +157,19 @@ func (uc UpgradeCalc) UpgradeMaxShips(resources float64) uint {
 	return uint(math.Floor(resources / uc.UpgradeCost(1)))
 }
 
-func BlockUpgradeCost(blockMass, currentBlockTech, targetBlockTech float64) float64 {
-	if blockMass == 0 || targetBlockTech <= currentBlockTech {
-		return 0
-	}
-	return (1 - currentBlockTech/targetBlockTech) * 10 * blockMass
-}
-
 func GroupUpgradeCost(sg *game.ShipGroup, st game.ShipType, drive, weapons, shields, cargo float64) UpgradeCalc {
 	uc := &UpgradeCalc{Cost: make(map[game.Tech]float64)}
 	if drive > 0 {
-		uc.Cost[game.TechDrive] = BlockUpgradeCost(st.DriveBlockMass(), sg.TechLevel(game.TechDrive).F(), drive)
+		uc.Cost[game.TechDrive] = calc.BlockUpgradeCost(st.DriveBlockMass(), sg.TechLevel(game.TechDrive).F(), drive)
 	}
 	if weapons > 0 {
-		uc.Cost[game.TechWeapons] = BlockUpgradeCost(st.WeaponsBlockMass(), sg.TechLevel(game.TechWeapons).F(), weapons)
+		uc.Cost[game.TechWeapons] = calc.BlockUpgradeCost(st.WeaponsBlockMass(), sg.TechLevel(game.TechWeapons).F(), weapons)
 	}
 	if shields > 0 {
-		uc.Cost[game.TechShields] = BlockUpgradeCost(st.ShieldsBlockMass(), sg.TechLevel(game.TechShields).F(), shields)
+		uc.Cost[game.TechShields] = calc.BlockUpgradeCost(st.ShieldsBlockMass(), sg.TechLevel(game.TechShields).F(), shields)
 	}
 	if cargo > 0 {
-		uc.Cost[game.TechCargo] = BlockUpgradeCost(st.CargoBlockMass(), sg.TechLevel(game.TechCargo).F(), cargo)
+		uc.Cost[game.TechCargo] = calc.BlockUpgradeCost(st.CargoBlockMass(), sg.TechLevel(game.TechCargo).F(), cargo)
 	}
 	return *uc
 }
@@ -218,7 +212,7 @@ func UpgradeGroupPreference(sg game.ShipGroup, st game.ShipType, tech game.Tech,
 		ti = len(su.UpgradeTech) - 1
 	}
 	su.UpgradeTech[ti].Level = game.F(v)
-	su.UpgradeTech[ti].Cost = game.F(BlockUpgradeCost(st.BlockMass(tech), sg.TechLevel(tech).F(), v) * float64(sg.Number))
+	su.UpgradeTech[ti].Cost = game.F(calc.BlockUpgradeCost(st.BlockMass(tech), sg.TechLevel(tech).F(), v) * float64(sg.Number))
 
 	sg.StateUpgrade = &su
 	return sg

game/internal/controller/ship_group_upgrade_test.go

@@ -13,12 +13,6 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
-func TestBlockUpgradeCost(t *testing.T) {
-	assert.Equal(t, 00.0, controller.BlockUpgradeCost(1, 1.0, 1.0))
-	assert.Equal(t, 25.0, controller.BlockUpgradeCost(5, 1.0, 2.0))
-	assert.Equal(t, 50.0, controller.BlockUpgradeCost(10, 1.0, 2.0))
-}
-
 func TestGroupUpgradeCost(t *testing.T) {
 	sg := &g.ShipGroup{
 		Tech: map[g.Tech]g.Float{

game/internal/generator/map.go

@@ -4,8 +4,7 @@ import (
 	"fmt"
 	"math/rand"
 
-	"galaxy/util"
-
+	"galaxy/calc"
 	"galaxy/game/internal/generator/plotter"
 )
 
@@ -59,7 +58,7 @@ func (m Map) NewCoordinate(deadZoneRaduis float64) (Coordinate, error) {
 }
 
 func (m Map) ShortDistance(from, to Coordinate) float64 {
-	return util.ShortDistance(m.Width, m.Height, from.X, from.Y, to.X, to.Y)
+	return calc.ShortDistance(m.Width, m.Height, from.X, from.Y, to.X, to.Y)
 }
 
 // RandI returns a random float64 value between min and max

game/internal/model/game/race.go

@@ -1,6 +1,7 @@
 package game
 
 import (
+	"galaxy/calc"
 	"strings"
 
 	"github.com/google/uuid"
@@ -54,9 +55,9 @@ func (r Race) TechLevel(t Tech) float64 {
 }
 
 func (r Race) FlightDistance() float64 {
-	return r.TechLevel(TechDrive) * 40
+	return calc.FligthDistance(r.TechLevel(TechDrive))
 }
 
 func (r Race) VisibilityDistance() float64 {
-	return r.TechLevel(TechDrive) * 30
+	return calc.VisibilityDistance(r.TechLevel(TechDrive))
 }

game/internal/repo/game.go

@@ -12,8 +12,8 @@ package repo
 
 import (
 	"encoding/json"
-	"errors"
 	"fmt"
+	"slices"
 
 	"galaxy/model/order"
 	"galaxy/model/report"
@@ -29,7 +29,9 @@ const (
 )
 
 type storedOrder struct {
-	Commands []json.RawMessage `json:"cmd"`
+	GameID    uuid.UUID         `json:"game_id"`
+	UpdatedAt int64             `json:"updatedAt"`
+	Commands  []json.RawMessage `json:"cmd"`
 }
 
 func (o storedOrder) MarshalBinary() (data []byte, err error) {
@@ -116,9 +118,25 @@ func loadMeta(s Storage) (*game.GameMeta, error) {
 	return result, nil
 }
 
-func saveMeta(s Storage, t uint, gm *game.GameMeta) error {
+func loadTurnMeta(s Storage, turn uint) (*game.GameMeta, error) {
+	var result *game.GameMeta = new(game.GameMeta)
+	path := fmt.Sprintf("%s/%s", TurnDir(turn), metaPath)
+	exist, err := s.Exists(path)
+	if err != nil {
+		return nil, NewStorageError(err)
+	}
+	if !exist {
+		return result, nil
+	}
+	if err := s.ReadSafe(path, result); err != nil {
+		return nil, NewStorageError(err)
+	}
+	return result, nil
+}
+
+func saveMeta(s Storage, turn uint, gm *game.GameMeta) error {
 	// save turn's meta
-	path := fmt.Sprintf("%s/%s", TurnDir(t), metaPath)
+	path := fmt.Sprintf("%s/%s", TurnDir(turn), metaPath)
 	if err := s.Write(path, gm); err != nil {
 		return NewStorageError(err)
 	}
@@ -130,27 +148,43 @@ func saveMeta(s Storage, t uint, gm *game.GameMeta) error {
 	return nil
 }
 
-func (r *repo) SaveBattle(t uint, b *report.BattleReport, m *game.BattleMeta) error {
+func (r *repo) LoadBattle(turn uint, id uuid.UUID) (*report.BattleReport, bool, error) {
+	meta, err := loadTurnMeta(r.s, turn)
+	if err != nil {
+		return nil, false, err
+	}
+	i := slices.IndexFunc(meta.Battles, func(m game.BattleMeta) bool { return m.BattleID == id })
+	if i < 0 {
+		return nil, false, nil
+	}
+	result, err := loadBattle(r.s, turn, meta.Battles[i].BattleID)
+	if err != nil {
+		return nil, false, err
+	}
+	return result, true, nil
+}
+
+func (r *repo) SaveBattle(turn uint, b *report.BattleReport, m *game.BattleMeta) error {
 	meta, err := loadMeta(r.s)
 	if err != nil {
 		return err
 	}
-	err = saveBattle(r.s, t, b)
+	err = saveBattle(r.s, turn, b)
 	if err != nil {
 		return err
 	}
 	meta.Battles = append(meta.Battles, *m)
-	return saveMeta(r.s, t, meta)
+	return saveMeta(r.s, turn, meta)
 }
 
-func saveBattle(s Storage, t uint, b *report.BattleReport) error {
-	path := fmt.Sprintf("%s/battle/%s.json", TurnDir(t), b.ID.String())
+func saveBattle(s Storage, turn uint, b *report.BattleReport) error {
+	path := fmt.Sprintf("%s/battle/%s.json", TurnDir(turn), b.ID.String())
 	exist, err := s.Exists(path)
 	if err != nil {
 		return NewStorageError(err)
 	}
 	if exist {
-		return NewStateError(fmt.Sprintf("battle %v for turn %d already has been saved", b.ID, t))
+		return NewStateError(fmt.Sprintf("battle %v for turn %d already has been saved", b.ID, turn))
 	}
 	if err := s.Write(path, b); err != nil {
 		return NewStorageError(err)
@@ -158,7 +192,23 @@ func saveBattle(s Storage, t uint, b *report.BattleReport) error {
 	return nil
 }
 
-func (r *repo) SaveBombings(t uint, b []*game.Bombing) error {
+func loadBattle(s Storage, turn uint, id uuid.UUID) (*report.BattleReport, error) {
+	path := fmt.Sprintf("%s/battle/%s.json", TurnDir(turn), id.String())
+	exist, err := s.Exists(path)
+	if err != nil {
+		return nil, NewStorageError(err)
+	}
+	if !exist {
+		return nil, NewStateError(fmt.Sprintf("battle %v for turn %d never was saved", id, turn))
+	}
+	result := new(report.BattleReport)
+	if err := s.ReadSafe(path, result); err != nil {
+		return nil, NewStorageError(err)
+	}
+	return result, nil
+}
+
+func (r *repo) SaveBombings(turn uint, b []*game.Bombing) error {
 	meta, err := loadMeta(r.s)
 	if err != nil {
 		return err
@@ -166,11 +216,11 @@ func (r *repo) SaveBombings(t uint, b []*game.Bombing) error {
 	for i := range b {
 		meta.Bombings = append(meta.Bombings, *b[i])
 	}
-	return saveMeta(r.s, t, meta)
+	return saveMeta(r.s, turn, meta)
 }
 
-func (r *repo) SaveReport(t uint, rep *report.Report) error {
-	return saveReport(r.s, t, rep)
+func (r *repo) SaveReport(turn uint, rep *report.Report) error {
+	return saveReport(r.s, turn, rep)
 }
 
 func saveReport(s Storage, t uint, v *report.Report) error {
@@ -181,12 +231,12 @@ func saveReport(s Storage, t uint, v *report.Report) error {
 	return nil
 }
 
-func (r *repo) LoadReport(t uint, id uuid.UUID) (*report.Report, error) {
-	return loadReport(r.s, t, id)
+func (r *repo) LoadReport(turn uint, id uuid.UUID) (*report.Report, error) {
+	return loadReport(r.s, turn, id)
 }
 
-func loadReport(s Storage, t uint, id uuid.UUID) (*report.Report, error) {
-	path := ReportDir(t, id)
+func loadReport(s Storage, turn uint, id uuid.UUID) (*report.Report, error) {
+	path := ReportDir(turn, id)
 	result := new(report.Report)
 	exist, err := s.Exists(path)
 	if err != nil {
@@ -201,11 +251,11 @@ func loadReport(s Storage, t uint, id uuid.UUID) (*report.Report, error) {
 	return result, nil
 }
 
-func (r *repo) SaveOrder(t uint, id uuid.UUID, o *order.Order) error {
+func (r *repo) SaveOrder(t uint, id uuid.UUID, o *order.UserGamesOrder) error {
 	return saveOrder(r.s, t, id, o)
 }
 
-func saveOrder(s Storage, t uint, id uuid.UUID, o *order.Order) error {
+func saveOrder(s Storage, t uint, id uuid.UUID, o *order.UserGamesOrder) error {
 	path := OrderDir(t, id)
 	if err := s.WriteSafe(path, o); err != nil {
 		return NewStorageError(err)
@@ -213,11 +263,11 @@ func saveOrder(s Storage, t uint, id uuid.UUID, o *order.Order) error {
 	return nil
 }
 
-func (r *repo) LoadOrder(t uint, id uuid.UUID) (*order.Order, bool, error) {
+func (r *repo) LoadOrder(t uint, id uuid.UUID) (*order.UserGamesOrder, bool, error) {
 	return loadOrder(r.s, t, id)
 }
 
-func loadOrder(s Storage, t uint, id uuid.UUID) (*order.Order, bool, error) {
+func loadOrder(s Storage, t uint, id uuid.UUID) (*order.UserGamesOrder, bool, error) {
 	path := OrderDir(t, id)
 
 	exist, err := s.Exists(path)
@@ -228,17 +278,22 @@ func loadOrder(s Storage, t uint, id uuid.UUID) (*order.Order, bool, error) {
 		return nil, false, nil
 	}
 
-	cmd := new(storedOrder)
-	if err := s.ReadSafe(path, cmd); err != nil {
+	stored := new(storedOrder)
+	if err := s.ReadSafe(path, stored); err != nil {
 		return nil, false, NewStorageError(err)
 	}
-	result := &order.Order{Commands: make([]order.DecodableCommand, len(cmd.Commands))}
-	if len(cmd.Commands) == 0 {
-		return nil, false, errors.New("no commands were stored")
+	// An empty stored batch is a valid state — the player either
+	// cleared their draft or never added a command yet. We round-
+	// trip it as `(*UserGamesOrder, true, nil)` with an empty
+	// `Commands` slice so callers can distinguish "no order yet"
+	// (ok=false) from "order exists but is empty" (ok=true).
+	result := &order.UserGamesOrder{
+		GameID:    stored.GameID,
+		UpdatedAt: stored.UpdatedAt,
+		Commands:  make([]order.DecodableCommand, len(stored.Commands)),
 	}
-
-	for i := range cmd.Commands {
-		command, err := ParseOrder(cmd.Commands[i], nil)
+	for i := range stored.Commands {
+		command, err := ParseOrder(stored.Commands[i], nil)
 		if err != nil {
 			return nil, false, err
 		}

game/internal/repo/repo_export_test.go

@@ -6,10 +6,10 @@ import (
 	"github.com/google/uuid"
 )
 
-func LoadOrder_T(s Storage, t uint, id uuid.UUID) (*order.Order, bool, error) {
+func LoadOrder_T(s Storage, t uint, id uuid.UUID) (*order.UserGamesOrder, bool, error) {
 	return loadOrder(s, t, id)
 }
 
-func SaveOrder_T(s Storage, t uint, id uuid.UUID, o *order.Order) error {
+func SaveOrder_T(s Storage, t uint, id uuid.UUID, o *order.UserGamesOrder) error {
 	return saveOrder(s, t, id, o)
 }

game/internal/repo/repo_test.go

@@ -3,6 +3,7 @@ package repo_test
 import (
 	"path/filepath"
 	"testing"
+	"time"
 
 	"galaxy/model/order"
 
@@ -18,7 +19,11 @@ func TestSaveOrder(t *testing.T) {
 	s, err := fs.NewFileStorage(root)
 	assert.NoError(t, err)
 	id := uuid.New()
-	o := &order.Order{
+	gameID := uuid.New()
+	now := time.Now().UTC().UnixMilli()
+	o := &order.UserGamesOrder{
+		GameID:    gameID,
+		UpdatedAt: now,
 		Commands: []order.DecodableCommand{
 			&order.CommandRaceVote{
 				CommandMeta: order.CommandMeta{
@@ -87,17 +92,63 @@ func TestSaveOrder(t *testing.T) {
 	LoadOrderTest(t, s, root, turn, id, o)
 }
 
-func LoadOrderTest(t *testing.T, s repo.Storage, root string, turn uint, id uuid.UUID, expected *order.Order) {
+func LoadOrderTest(t *testing.T, s repo.Storage, root string, turn uint, id uuid.UUID, expected *order.UserGamesOrder) {
 	o, ok, err := repo.LoadOrder_T(s, turn, id)
 	assert.NoError(t, err)
 	assert.True(t, ok)
 	assert.Len(t, o.Commands, 5)
+	assert.Equal(t, expected.GameID, o.GameID)
+	assert.Equal(t, expected.UpdatedAt, o.UpdatedAt)
 	assert.ElementsMatch(t, expected.Commands, o.Commands)
 
 	CommandResultTest(t, o)
 }
 
-func CommandResultTest(t *testing.T, o *order.Order) {
+func TestSaveOrderEmptyRoundTrip(t *testing.T) {
+	// An empty order is a legal player intent (the user removed
+	// every command from the draft). The repo round-trips it as an
+	// `(*UserGamesOrder, true, nil)` triple with `Commands` empty
+	// so the front-end can distinguish "no order yet" (ok=false)
+	// from "order exists but is empty" (ok=true).
+	root := t.ArtifactDir()
+	s, err := fs.NewFileStorage(root)
+	assert.NoError(t, err)
+	id := uuid.New()
+	gameID := uuid.New()
+	now := time.Now().UTC().UnixMilli()
+	o := &order.UserGamesOrder{
+		GameID:    gameID,
+		UpdatedAt: now,
+	}
+	var turn uint = 3
+
+	assert.NoError(t, repo.SaveOrder_T(s, turn, id, o))
+	assert.FileExists(t, filepath.Join(root, repo.OrderDir(turn, id)))
+
+	loaded, ok, err := repo.LoadOrder_T(s, turn, id)
+	assert.NoError(t, err)
+	assert.True(t, ok, "empty order must surface as ok=true so callers can tell it apart from a missing one")
+	assert.NotNil(t, loaded)
+	assert.Equal(t, gameID, loaded.GameID)
+	assert.Equal(t, now, loaded.UpdatedAt)
+	assert.Empty(t, loaded.Commands)
+}
+
+func TestLoadOrderMissing(t *testing.T) {
+	// A turn that has never had a PUT must come back as
+	// `(nil, false, nil)` — the engine's "no stored order" path.
+	root := t.ArtifactDir()
+	s, err := fs.NewFileStorage(root)
+	assert.NoError(t, err)
+	id := uuid.New()
+
+	loaded, ok, err := repo.LoadOrder_T(s, 7, id)
+	assert.NoError(t, err)
+	assert.False(t, ok)
+	assert.Nil(t, loaded)
+}
+
+func CommandResultTest(t *testing.T, o *order.UserGamesOrder) {
 	assert.NotEmpty(t, o.Commands)
 	for i := range o.Commands {
 		if v, ok := order.AsCommand[*order.CommandRaceVote](o.Commands[i]); ok {

game/internal/router/battle_test.go

@@ -0,0 +1,152 @@
+package router_test
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"galaxy/model/report"
+
+	"github.com/google/uuid"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestGetBattleValidation(t *testing.T) {
+	validUUID := uuid.New().String()
+
+	for _, tc := range []struct {
+		description  string
+		turn         string
+		battleID     string
+		expectStatus int
+	}{
+		{"Negative turn", "-1", validUUID, http.StatusBadRequest},
+		{"Non-numeric turn", "abc", validUUID, http.StatusBadRequest},
+		{"Invalid uuid", "0", invalidId, http.StatusBadRequest},
+	} {
+		t.Run(tc.description, func(t *testing.T) {
+			e := &dummyExecutor{}
+			r := setupRouterExecutor(e)
+
+			w := httptest.NewRecorder()
+			path := fmt.Sprintf("/api/v1/battle/%s/%s", tc.turn, tc.battleID)
+			req, _ := http.NewRequest(http.MethodGet, path, nil)
+			r.ServeHTTP(w, req)
+
+			assert.Equal(t, tc.expectStatus, w.Code, w.Body)
+			assert.Equal(t, uuid.Nil, e.FetchBattleID, "FetchBattle must not be called on validation error")
+		})
+	}
+}
+
+func TestGetBattleFound(t *testing.T) {
+	id := uuid.New()
+	raceA := uuid.New()
+	raceB := uuid.New()
+	stored := &report.BattleReport{
+		ID:         id,
+		Planet:     42,
+		PlanetName: "X-Prime",
+		Races: map[int]uuid.UUID{
+			0: raceA,
+			1: raceB,
+		},
+		Ships: map[int]report.BattleReportGroup{
+			10: {
+				Race:         "Alpha",
+				ClassName:    "Drone",
+				Tech:         map[string]report.Float{"WEAPONS": report.F(1)},
+				Number:       5,
+				NumberLeft:   3,
+				LoadType:     "EMP",
+				LoadQuantity: report.F(0),
+				InBattle:     true,
+			},
+			20: {
+				Race:         "Beta",
+				ClassName:    "Spy",
+				Tech:         map[string]report.Float{"SHIELDS": report.F(2)},
+				Number:       4,
+				NumberLeft:   0,
+				LoadType:     "EMP",
+				LoadQuantity: report.F(0),
+				InBattle:     true,
+			},
+		},
+		Protocol: []report.BattleActionReport{
+			{Attacker: 0, AttackerShipClass: 10, Defender: 1, DefenderShipClass: 20, Destroyed: true},
+		},
+	}
+	e := &dummyExecutor{
+		FetchBattleResult: stored,
+		FetchBattleOK:     true,
+	}
+	r := setupRouterExecutor(e)
+
+	w := httptest.NewRecorder()
+	path := fmt.Sprintf("/api/v1/battle/%d/%s", 7, id.String())
+	req, _ := http.NewRequest(http.MethodGet, path, nil)
+	r.ServeHTTP(w, req)
+
+	require.Equal(t, http.StatusOK, w.Code, w.Body)
+	assert.Equal(t, uint(7), e.FetchBattleTurn)
+	assert.Equal(t, id, e.FetchBattleID)
+
+	var got report.BattleReport
+	require.NoError(t, json.Unmarshal(w.Body.Bytes(), &got))
+	assert.Equal(t, stored.ID, got.ID)
+	assert.Equal(t, stored.Planet, got.Planet)
+	assert.Equal(t, stored.PlanetName, got.PlanetName)
+	assert.Equal(t, stored.Races, got.Races)
+	require.Len(t, got.Ships, len(stored.Ships))
+	assert.Equal(t, stored.Ships[10].ClassName, got.Ships[10].ClassName)
+	assert.Equal(t, stored.Ships[20].NumberLeft, got.Ships[20].NumberLeft)
+	require.Len(t, got.Protocol, 1)
+	assert.Equal(t, stored.Protocol[0], got.Protocol[0])
+}
+
+func TestGetBattleTurnZero(t *testing.T) {
+	id := uuid.New()
+	e := &dummyExecutor{
+		FetchBattleResult: &report.BattleReport{ID: id},
+		FetchBattleOK:     true,
+	}
+	r := setupRouterExecutor(e)
+
+	w := httptest.NewRecorder()
+	req, _ := http.NewRequest(http.MethodGet, fmt.Sprintf("/api/v1/battle/0/%s", id.String()), nil)
+	r.ServeHTTP(w, req)
+
+	require.Equal(t, http.StatusOK, w.Code, w.Body)
+	assert.Equal(t, uint(0), e.FetchBattleTurn)
+	assert.Equal(t, id, e.FetchBattleID)
+}
+
+func TestGetBattleNotFound(t *testing.T) {
+	id := uuid.New()
+	e := &dummyExecutor{FetchBattleOK: false}
+	r := setupRouterExecutor(e)
+
+	w := httptest.NewRecorder()
+	req, _ := http.NewRequest(http.MethodGet, fmt.Sprintf("/api/v1/battle/3/%s", id.String()), nil)
+	r.ServeHTTP(w, req)
+
+	assert.Equal(t, http.StatusNotFound, w.Code, w.Body)
+	assert.Equal(t, uint(3), e.FetchBattleTurn)
+	assert.Equal(t, id, e.FetchBattleID)
+}
+
+func TestGetBattleEngineError(t *testing.T) {
+	e := &dummyExecutor{FetchBattleErr: errors.New("engine boom")}
+	r := setupRouterExecutor(e)
+
+	w := httptest.NewRecorder()
+	req, _ := http.NewRequest(http.MethodGet, fmt.Sprintf("/api/v1/battle/3/%s", uuid.NewString()), nil)
+	r.ServeHTTP(w, req)
+
+	assert.Equal(t, http.StatusInternalServerError, w.Code, w.Body)
+}

game/internal/router/handler/battle.go

@@ -0,0 +1,37 @@
+package handler
+
+import (
+	"net/http"
+	"strconv"
+
+	"github.com/gin-gonic/gin"
+	"github.com/google/uuid"
+)
+
+func BattleHandler(c *gin.Context, executor CommandExecutor) {
+	turn := c.Param("turn")
+	t, err := strconv.Atoi(turn)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	if t < 0 {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "turn number can't be negative"})
+		return
+	}
+	id := c.Param("uuid")
+	battleID, err := uuid.Parse(id)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	r, exists, err := executor.FetchBattle(uint(t), battleID)
+	if errorResponse(c, err) {
+		return
+	}
+	if !exists {
+		c.JSON(http.StatusNotFound, gin.H{"error": "unknown battle"})
+		return
+	}
+	c.JSON(http.StatusOK, r)
+}

game/internal/router/handler/command.go

@@ -2,7 +2,6 @@ package handler
 
 import (
 	"encoding/json"
-	"errors"
 	"fmt"
 	"net/http"
 
@@ -33,7 +32,12 @@ func CommandHandler(c *gin.Context, executor CommandExecutor) {
 		commands[i] = command
 	}
 	if len(commands) == 0 {
-		errorResponse(c, errors.New("no commands given"))
+		// `PUT /api/v1/command` is the immediate-execution path —
+		// running an empty batch is a meaningless no-op, so we
+		// reject it with `400` rather than rely on the validator.
+		// `PUT /api/v1/order` keeps an empty list (the player
+		// cleared their draft) — see `OrderHandler`.
+		c.JSON(http.StatusBadRequest, gin.H{"error": "no commands given"})
 		return
 	}
 
@@ -41,7 +45,7 @@ func CommandHandler(c *gin.Context, executor CommandExecutor) {
 		return
 	}
 
-	c.Status(http.StatusNoContent)
+	c.Status(http.StatusAccepted)
 }
 
 func parseCommand(actor string, c json.RawMessage) (Command, error) {

game/internal/router/handler/handler.go

@@ -17,6 +17,7 @@ import (
 
 	"github.com/gin-gonic/gin"
 	"github.com/go-playground/validator/v10"
+	"github.com/google/uuid"
 )
 
 type CommandExecutor interface {
@@ -25,8 +26,11 @@ type CommandExecutor interface {
 	GameState() (rest.StateResponse, error)
 	BanishRace(string) error
 	LoadReport(actor string, turn uint) (*report.Report, error)
+	// Execute is reserved for future use; any API request for orders should use ValidateOrder
 	Execute(cmd ...Command) error
-	ValidateOrder(actor string, cmd ...order.DecodableCommand) error
+	ValidateOrder(actor string, cmd ...order.DecodableCommand) (*order.UserGamesOrder, error)
+	FetchOrder(actor string, turn uint) (*order.UserGamesOrder, bool, error)
+	FetchBattle(turn uint, ID uuid.UUID) (*report.BattleReport, bool, error)
 }
 
 type Command func(controller.Ctrl) error
@@ -76,10 +80,18 @@ func (e *executor) Execute(cmd ...Command) error {
 	})
 }
 
-func (e *executor) ValidateOrder(actor string, cmd ...order.DecodableCommand) error {
+func (e *executor) ValidateOrder(actor string, cmd ...order.DecodableCommand) (*order.UserGamesOrder, error) {
 	return controller.ValidateOrder(e.cfg, actor, cmd...)
 }
 
+func (e *executor) FetchOrder(actor string, turn uint) (*order.UserGamesOrder, bool, error) {
+	return controller.FetchOrder(e.cfg, actor, turn)
+}
+
+func (e *executor) FetchBattle(turn uint, ID uuid.UUID) (*report.BattleReport, bool, error) {
+	return controller.FetchBattle(e.cfg, turn, ID)
+}
+
 func (e *executor) GenerateGame(races []string) (rest.StateResponse, error) {
 	s, err := controller.GenerateGame(e.cfg, races)
 	if err != nil {

game/internal/router/handler/order.go

@@ -1,7 +1,6 @@
 package handler
 
 import (
-	"errors"
 	"net/http"
 
 	"galaxy/model/order"
@@ -12,12 +11,16 @@ import (
 	"github.com/gin-gonic/gin"
 )
 
-func OrderHandler(c *gin.Context, executor CommandExecutor) {
+func PutOrderHandler(c *gin.Context, executor CommandExecutor) {
 	var cmd rest.Command
 	if errorResponse(c, c.ShouldBindJSON(&cmd)) {
 		return
 	}
 
+	// An empty `cmd` array is a valid PUT: the client clears its
+	// local order draft and expects the server to mirror that
+	// state. The engine stores the empty batch so the next GET
+	// returns the same empty list with the new `updatedAt`.
 	commands := make([]order.DecodableCommand, len(cmd.Commands))
 	for i := range cmd.Commands {
 		command, err := repo.ParseOrder(cmd.Commands[i], validateCommand)
@@ -26,14 +29,38 @@ func OrderHandler(c *gin.Context, executor CommandExecutor) {
 		}
 		commands[i] = command
 	}
-	if len(commands) == 0 {
-		errorResponse(c, errors.New("no commands given"))
+
+	result, err := executor.ValidateOrder(cmd.Actor, commands...)
+	if errorResponse(c, err) {
 		return
 	}
 
-	if errorResponse(c, executor.ValidateOrder(cmd.Actor, commands...)) {
-		return
-	}
-
-	c.Status(http.StatusNoContent)
+	c.JSON(http.StatusAccepted, result)
+}
+
+type orderParam struct {
+	Player string `form:"player" binding:"required,notblank"`
+	Turn   int    `form:"turn" binding:"gte=0"`
+}
+
+func GetOrderHandler(c *gin.Context, executor CommandExecutor) {
+	p := &orderParam{}
+	// ShouldBindQuery surfaces both validator failures and strconv parse
+	// errors; both are client-side faults, so 400 is the correct mapping.
+	if err := c.ShouldBindQuery(p); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	o, ok, err := executor.FetchOrder(p.Player, uint(p.Turn))
+	if errorResponse(c, err) {
+		return
+	}
+	if !ok {
+		// no order has been previously stored by the player for this turn
+		c.Status(http.StatusNoContent)
+		return
+	}
+
+	c.JSON(http.StatusOK, o)
 }

game/internal/router/order_test.go

@@ -2,6 +2,7 @@ package router_test
 
 import (
 	"encoding/json"
+	"errors"
 	"net/http"
 	"net/http/httptest"
 	"testing"
@@ -9,7 +10,9 @@ import (
 	"galaxy/model/order"
 	"galaxy/model/rest"
 
+	"github.com/google/uuid"
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 func TestOrderRaceQuit(t *testing.T) {
@@ -57,16 +60,25 @@ func TestOrderRaceQuit(t *testing.T) {
 
 	assert.Equal(t, http.StatusBadRequest, w.Code, w.Body)
 
-	// error: no commands
+	// empty cmd[] is a valid PUT — the player cleared their draft;
+	// the engine stores the empty batch and answers with the
+	// canonical `UserGamesOrder` envelope. ValidateOrder receives a
+	// zero-length variadic and the response carries no commands.
 	payload = &rest.Command{
 		Actor: commandDefaultActor,
 	}
+	exec := &dummyExecutor{}
+	emptyRouter := setupRouterExecutor(exec)
 
 	w = httptest.NewRecorder()
 	req, _ = http.NewRequest(apiCommandMethod, apiOrderPath, asBody(payload))
-	r.ServeHTTP(w, req)
+	emptyRouter.ServeHTTP(w, req)
 
-	assert.Equal(t, http.StatusBadRequest, w.Code, w.Body)
+	assert.Equal(t, commandNoErrorsStatus, w.Code, w.Body)
+	assert.Equal(t, 0, exec.CommandsExecuted)
+	var stored order.UserGamesOrder
+	require.NoError(t, json.Unmarshal(w.Body.Bytes(), &stored))
+	assert.Empty(t, stored.Commands)
 }
 
 func TestOrderRaceVote(t *testing.T) {
@@ -940,3 +952,168 @@ func TestMultipleCommandOrder(t *testing.T) {
 
 	assert.Equal(t, 2, e.(*dummyExecutor).CommandsExecuted)
 }
+
+func TestPutOrderResponseBody(t *testing.T) {
+	e := &dummyExecutor{
+		ValidateOrderResult: &order.UserGamesOrder{
+			GameID:    uuid.New(),
+			UpdatedAt: 1700,
+			Commands: []order.DecodableCommand{
+				&order.CommandRaceVote{
+					CommandMeta: order.CommandMeta{CmdID: id(), CmdType: order.CommandTypeRaceVote},
+					Acceptor:    "Opponent",
+				},
+			},
+		},
+	}
+	r := setupRouterExecutor(e)
+
+	payload := &rest.Command{
+		Actor: commandDefaultActor,
+		Commands: []json.RawMessage{
+			encodeCommand(&order.CommandRaceVote{
+				CommandMeta: order.CommandMeta{CmdID: id(), CmdType: order.CommandTypeRaceVote},
+				Acceptor:    "Opponent",
+			}),
+		},
+	}
+
+	w := httptest.NewRecorder()
+	req, _ := http.NewRequest(apiCommandMethod, apiOrderPath, asBody(payload))
+	r.ServeHTTP(w, req)
+
+	require.Equal(t, http.StatusAccepted, w.Code, w.Body)
+
+	var got struct {
+		GameID    uuid.UUID         `json:"game_id"`
+		UpdatedAt int64             `json:"updatedAt"`
+		Commands  []json.RawMessage `json:"cmd"`
+	}
+	require.NoError(t, json.Unmarshal(w.Body.Bytes(), &got))
+	assert.Equal(t, e.ValidateOrderResult.GameID, got.GameID)
+	assert.Equal(t, e.ValidateOrderResult.UpdatedAt, got.UpdatedAt)
+	assert.Len(t, got.Commands, 1)
+}
+
+func TestPutOrderEngineError(t *testing.T) {
+	e := &dummyExecutor{ValidateOrderErr: errors.New("engine boom")}
+	r := setupRouterExecutor(e)
+
+	payload := &rest.Command{
+		Actor: commandDefaultActor,
+		Commands: []json.RawMessage{
+			encodeCommand(&order.CommandRaceVote{
+				CommandMeta: order.CommandMeta{CmdID: id(), CmdType: order.CommandTypeRaceVote},
+				Acceptor:    "Opponent",
+			}),
+		},
+	}
+
+	w := httptest.NewRecorder()
+	req, _ := http.NewRequest(apiCommandMethod, apiOrderPath, asBody(payload))
+	r.ServeHTTP(w, req)
+
+	assert.Equal(t, http.StatusInternalServerError, w.Code, w.Body)
+}
+
+func TestGetOrderQueryValidation(t *testing.T) {
+	for _, tc := range []struct {
+		description  string
+		query        string
+		expectStatus int
+	}{
+		{"Missing player param", "", http.StatusBadRequest},
+		{"Empty player", "?player=", http.StatusBadRequest},
+		{"Blank player", "?player=%20%20%20", http.StatusBadRequest},
+		{"Negative turn", "?player=Race_01&turn=-1", http.StatusBadRequest},
+		{"Non-numeric turn", "?player=Race_01&turn=abc", http.StatusBadRequest},
+	} {
+		t.Run(tc.description, func(t *testing.T) {
+			e := &dummyExecutor{}
+			r := setupRouterExecutor(e)
+
+			w := httptest.NewRecorder()
+			req, _ := http.NewRequest(http.MethodGet, apiOrderPath+tc.query, nil)
+			r.ServeHTTP(w, req)
+
+			assert.Equal(t, tc.expectStatus, w.Code, w.Body)
+			assert.Empty(t, e.FetchOrderActor, "FetchOrder must not be called on validation error")
+		})
+	}
+}
+
+func TestGetOrderFound(t *testing.T) {
+	stored := &order.UserGamesOrder{
+		GameID:    uuid.New(),
+		UpdatedAt: 4242,
+		Commands: []order.DecodableCommand{
+			&order.CommandRaceVote{
+				CommandMeta: order.CommandMeta{CmdID: id(), CmdType: order.CommandTypeRaceVote},
+				Acceptor:    "Opponent",
+			},
+		},
+	}
+	e := &dummyExecutor{
+		FetchOrderResult: stored,
+		FetchOrderOK:     true,
+	}
+	r := setupRouterExecutor(e)
+
+	w := httptest.NewRecorder()
+	req, _ := http.NewRequest(http.MethodGet, apiOrderPath+"?player=Race_01&turn=3", nil)
+	r.ServeHTTP(w, req)
+
+	require.Equal(t, http.StatusOK, w.Code, w.Body)
+	assert.Equal(t, "Race_01", e.FetchOrderActor)
+	assert.Equal(t, uint(3), e.FetchOrderTurn)
+
+	var got struct {
+		GameID    uuid.UUID         `json:"game_id"`
+		UpdatedAt int64             `json:"updatedAt"`
+		Commands  []json.RawMessage `json:"cmd"`
+	}
+	require.NoError(t, json.Unmarshal(w.Body.Bytes(), &got))
+	assert.Equal(t, stored.GameID, got.GameID)
+	assert.Equal(t, stored.UpdatedAt, got.UpdatedAt)
+	assert.Len(t, got.Commands, 1)
+}
+
+func TestGetOrderTurnDefaultsToZero(t *testing.T) {
+	e := &dummyExecutor{
+		FetchOrderResult: &order.UserGamesOrder{GameID: uuid.New(), UpdatedAt: 1, Commands: []order.DecodableCommand{}},
+		FetchOrderOK:     true,
+	}
+	r := setupRouterExecutor(e)
+
+	w := httptest.NewRecorder()
+	req, _ := http.NewRequest(http.MethodGet, apiOrderPath+"?player=Race_01", nil)
+	r.ServeHTTP(w, req)
+
+	require.Equal(t, http.StatusOK, w.Code, w.Body)
+	assert.Equal(t, uint(0), e.FetchOrderTurn)
+}
+
+func TestGetOrderNotFound(t *testing.T) {
+	e := &dummyExecutor{FetchOrderOK: false}
+	r := setupRouterExecutor(e)
+
+	w := httptest.NewRecorder()
+	req, _ := http.NewRequest(http.MethodGet, apiOrderPath+"?player=Race_01&turn=2", nil)
+	r.ServeHTTP(w, req)
+
+	assert.Equal(t, http.StatusNoContent, w.Code, w.Body)
+	assert.Empty(t, w.Body.Bytes(), "204 response must carry no body")
+	assert.Equal(t, "Race_01", e.FetchOrderActor)
+	assert.Equal(t, uint(2), e.FetchOrderTurn)
+}
+
+func TestGetOrderEngineError(t *testing.T) {
+	e := &dummyExecutor{FetchOrderErr: errors.New("engine boom")}
+	r := setupRouterExecutor(e)
+
+	w := httptest.NewRecorder()
+	req, _ := http.NewRequest(http.MethodGet, apiOrderPath+"?player=Race_01&turn=0", nil)
+	r.ServeHTTP(w, req)
+
+	assert.Equal(t, http.StatusInternalServerError, w.Code, w.Body)
+}

game/internal/router/router.go

@@ -74,8 +74,12 @@ func setupRouter(executor handler.CommandExecutor) *gin.Engine {
 	groupAdmin.POST("/race/banish", func(ctx *gin.Context) { handler.BanishHandler(ctx, executor) })
 
 	groupV1.GET("/report", func(ctx *gin.Context) { handler.ReportHandler(ctx, executor) })
+	groupV1.PUT("/order", func(ctx *gin.Context) { handler.PutOrderHandler(ctx, executor) })
+	groupV1.GET("/order", func(ctx *gin.Context) { handler.GetOrderHandler(ctx, executor) })
+	groupV1.GET("/battle/:turn/:uuid", func(ctx *gin.Context) { handler.BattleHandler(ctx, executor) })
+
+	// /command is reserved for future use; any API request for orders should use /order
 	groupV1.PUT("/command", LimitMiddleware(1), func(ctx *gin.Context) { handler.CommandHandler(ctx, executor) })
-	groupV1.PUT("/order", func(ctx *gin.Context) { handler.OrderHandler(ctx, executor) })
 
 	return r
 }

game/internal/router/router_helper_test.go

@@ -16,7 +16,7 @@ import (
 )
 
 var (
-	commandNoErrorsStatus = http.StatusNoContent
+	commandNoErrorsStatus = http.StatusAccepted
 	commandDefaultActor   = "Gorlum"
 	apiCommandMethod      = "PUT"
 	apiCommandPath        = "/api/v1/command"
@@ -32,11 +32,53 @@ func id() string {
 
 type dummyExecutor struct {
 	CommandsExecuted int
+
+	// ValidateOrderResult, when non-nil, is returned from ValidateOrder.
+	// When nil, ValidateOrder synthesises an order from the received args
+	// so the response body is non-empty for status assertions.
+	ValidateOrderResult *order.UserGamesOrder
+	ValidateOrderErr    error
+
+	// FetchOrder controls and observes calls to FetchOrder.
+	FetchOrderActor  string
+	FetchOrderTurn   uint
+	FetchOrderResult *order.UserGamesOrder
+	FetchOrderOK     bool
+	FetchOrderErr    error
+
+	// FetchBattle controls and observes calls to FetchBattle.
+	FetchBattleTurn   uint
+	FetchBattleID     uuid.UUID
+	FetchBattleResult *report.BattleReport
+	FetchBattleOK     bool
+	FetchBattleErr    error
 }
 
-func (e *dummyExecutor) ValidateOrder(actor string, cmd ...order.DecodableCommand) error {
+func (e *dummyExecutor) ValidateOrder(actor string, cmd ...order.DecodableCommand) (*order.UserGamesOrder, error) {
 	e.CommandsExecuted = len(cmd)
-	return nil
+	if e.ValidateOrderErr != nil {
+		return nil, e.ValidateOrderErr
+	}
+	if e.ValidateOrderResult != nil {
+		return e.ValidateOrderResult, nil
+	}
+	return &order.UserGamesOrder{
+		GameID:    uuid.New(),
+		UpdatedAt: 1,
+		Commands:  append([]order.DecodableCommand(nil), cmd...),
+	}, nil
+}
+
+func (e *dummyExecutor) FetchOrder(actor string, turn uint) (*order.UserGamesOrder, bool, error) {
+	e.FetchOrderActor = actor
+	e.FetchOrderTurn = turn
+	return e.FetchOrderResult, e.FetchOrderOK, e.FetchOrderErr
+}
+
+func (e *dummyExecutor) FetchBattle(turn uint, ID uuid.UUID) (*report.BattleReport, bool, error) {
+	e.FetchBattleTurn = turn
+	e.FetchBattleID = ID
+	return e.FetchBattleResult, e.FetchBattleOK, e.FetchBattleErr
 }
 
 func (e *dummyExecutor) Execute(command ...handler.Command) error {

game/openapi.yaml

@@ -136,8 +136,9 @@ paths:
       description: |
         Applies one or more game commands for the specified actor. Serialized
         to one concurrent execution; requests that cannot acquire the execution
-        slot within 100 ms return `504 Gateway Timeout`. Returns `204 No
-        Content` on success.
+        slot within 100 ms return `504 Gateway Timeout`. Returns `202 Accepted`
+        with no body on success. Reserved for future use; player order
+        submissions go through `/api/v1/order`.
       requestBody:
         required: true
         content:
@@ -145,8 +146,8 @@ paths:
             schema:
               $ref: "#/components/schemas/CommandRequest"
       responses:
-        "204":
-          description: All commands applied successfully.
+        "202":
+          description: All commands accepted.
         "400":
           $ref: "#/components/responses/ValidationError"
         "504":
@@ -161,7 +162,9 @@ paths:
       summary: Validate and store a player order without executing it
       description: |
         Validates and stores the game commands structurally without executing them.
-        Returns `204 No Content` if the order is valid and accepted.
+        On success returns `202 Accepted` with the stored order, including the
+        engine-assigned `updatedAt` timestamp used by clients to detect stale
+        submissions.
       requestBody:
         required: true
         content:
@@ -169,12 +172,68 @@ paths:
             schema:
               $ref: "#/components/schemas/CommandRequest"
       responses:
-        "204":
-          description: Order is structurally valid.
+        "202":
+          description: Order is structurally valid and stored.
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/UserGamesOrder"
         "400":
           $ref: "#/components/responses/ValidationError"
         "500":
           $ref: "#/components/responses/InternalError"
+    get:
+      tags:
+        - PlayerActions
+      operationId: getOrder
+      summary: Fetch the stored order for a player and turn
+      description: |
+        Returns the order previously stored by `PUT /api/v1/order` for the
+        specified player and turn. Responds `204 No Content` when no order
+        has been stored for that turn.
+      parameters:
+        - $ref: "#/components/parameters/PlayerParam"
+        - $ref: "#/components/parameters/TurnParam"
+      responses:
+        "200":
+          description: Stored player order for the requested turn.
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/UserGamesOrder"
+        "204":
+          description: No order has been stored for this player on this turn.
+        "400":
+          $ref: "#/components/responses/ValidationError"
+        "500":
+          $ref: "#/components/responses/InternalError"
+  /api/v1/battle/{turn}/{uuid}:
+    get:
+      tags:
+        - PlayerActions
+      operationId: getBattle
+      summary: Fetch a single battle report
+      description: |
+        Returns the full `BattleReport` for the supplied `turn` and battle
+        identifier. The `turn` segment must be a non-negative integer; the
+        `uuid` segment must be a valid RFC 4122 UUID. Responds with
+        `404 Not Found` when no battle is stored for the supplied pair.
+      parameters:
+        - $ref: "#/components/parameters/BattleTurnParam"
+        - $ref: "#/components/parameters/BattleIDParam"
+      responses:
+        "200":
+          description: Battle report for the supplied turn and identifier.
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/BattleReport"
+        "400":
+          $ref: "#/components/responses/ValidationError"
+        "404":
+          description: No battle exists for the supplied turn and identifier.
+        "500":
+          $ref: "#/components/responses/InternalError"
   /api/v1/admin/turn:
     put:
       tags:
@@ -233,6 +292,22 @@ components:
         type: integer
         minimum: 0
         default: 0
+    BattleTurnParam:
+      name: turn
+      in: path
+      required: true
+      description: Turn number the battle was generated on.
+      schema:
+        type: integer
+        minimum: 0
+    BattleIDParam:
+      name: uuid
+      in: path
+      required: true
+      description: Battle identifier (RFC 4122 UUID).
+      schema:
+        type: string
+        format: uuid
   schemas:
     HealthzResponse:
       type: object
@@ -362,6 +437,32 @@ components:
           minItems: 1
           items:
             $ref: "#/components/schemas/Command"
+    UserGamesOrder:
+      type: object
+      description: |
+        Stored player order. Returned by `PUT /api/v1/order` after successful
+        validation and by `GET /api/v1/order` when fetching a previously stored
+        batch. `cmd` mirrors the command list submitted by the player; entries
+        carry per-command result fields (`cmdApplied`, `cmdErrorCode`) once the
+        order has been processed during turn generation.
+      required:
+        - game_id
+        - updatedAt
+        - cmd
+      properties:
+        game_id:
+          type: string
+          format: uuid
+          description: Identifier of the game this order belongs to.
+        updatedAt:
+          type: integer
+          format: int64
+          description: Engine-assigned UTC millisecond timestamp of the last write.
+        cmd:
+          type: array
+          description: Commands stored as part of this order, in submission order.
+          items:
+            $ref: "#/components/schemas/Command"
     Command:
       type: object
       description: |
@@ -483,10 +584,9 @@ components:
             $ref: "#/components/schemas/OtherShipClass"
         battle:
           type: array
-          description: UUIDs of battle reports relevant to this turn.
+          description: Battle summaries relevant to this turn.
           items:
-            type: string
-            format: uuid
+            $ref: "#/components/schemas/BattleSummary"
         bombing:
           type: array
           description: Bombing events that occurred during this turn.
@@ -730,6 +830,148 @@ components:
         wiped:
           type: boolean
           description: True when all population was eliminated by the bombing.
+    BattleSummary:
+      type: object
+      description: |
+        Identifies one battle relevant to the report recipient. Used by
+        clients to render a battle marker on the map without fetching
+        the full BattleReport. `planet` locates the marker; `shots`
+        scales the marker stroke with the battle length.
+      required:
+        - id
+        - planet
+        - shots
+      properties:
+        id:
+          type: string
+          format: uuid
+          description: Battle identifier; fetch the full report via `/api/v1/battle/{turn}/{uuid}`.
+        planet:
+          type: integer
+          minimum: 0
+          description: Planet number the battle took place on.
+        shots:
+          type: integer
+          minimum: 0
+          description: Number of shots exchanged during the battle.
+    BattleReport:
+      type: object
+      description: |
+        Full battle report. `races` and `ships` are JSON objects whose
+        keys are stringified integers used to cross-reference entries
+        from `protocol`: a `BattleActionReport` carries integer indices
+        into both maps. The serialised key is a string because JSON
+        object keys are always strings.
+      required:
+        - id
+        - planet
+        - planetName
+        - races
+        - ships
+        - protocol
+      properties:
+        id:
+          type: string
+          format: uuid
+          description: Battle identifier.
+        planet:
+          type: integer
+          minimum: 0
+          description: Planet number the battle took place on.
+        planetName:
+          type: string
+          description: Planet name at battle start.
+        races:
+          type: object
+          description: |
+            Participating races keyed by the integer index used in
+            `protocol.a` / `protocol.d`. Values are race identifiers.
+          additionalProperties:
+            type: string
+            format: uuid
+        ships:
+          type: object
+          description: |
+            Participating ship groups keyed by the integer index used
+            in `protocol.sa` / `protocol.sd`.
+          additionalProperties:
+            $ref: "#/components/schemas/BattleReportGroup"
+        protocol:
+          type: array
+          description: Ordered list of shots exchanged during the battle.
+          items:
+            $ref: "#/components/schemas/BattleActionReport"
+    BattleReportGroup:
+      type: object
+      description: One ship group participating in the battle.
+      required:
+        - race
+        - className
+        - tech
+        - num
+        - numLeft
+        - loadType
+        - loadQuantity
+        - inBattle
+      properties:
+        race:
+          type: string
+          description: Race name of the group owner.
+        className:
+          type: string
+          description: Ship class name; resolvable through `LocalShipClass` or `OtherShipClass`.
+        tech:
+          type: object
+          description: Technology levels keyed by tech type name.
+          additionalProperties:
+            type: number
+        num:
+          type: integer
+          minimum: 0
+          description: Initial number of ships in this group.
+        numLeft:
+          type: integer
+          minimum: 0
+          description: Number of ships remaining at the end of the battle.
+        loadType:
+          type: string
+          description: Type of cargo loaded.
+        loadQuantity:
+          type: number
+          description: Quantity of cargo loaded.
+        inBattle:
+          type: boolean
+          description: |
+            True when the group actually fights. False groups observe
+            the battle in peace state and never fire or take damage.
+    BattleActionReport:
+      type: object
+      description: |
+        One shot in the battle. Attacker and defender indices reference
+        `BattleReport.races`; ship-class indices reference
+        `BattleReport.ships`.
+      required:
+        - a
+        - sa
+        - d
+        - sd
+        - x
+      properties:
+        a:
+          type: integer
+          description: Index into `BattleReport.races` for the attacker.
+        sa:
+          type: integer
+          description: Index into `BattleReport.ships` for the attacker's group.
+        d:
+          type: integer
+          description: Index into `BattleReport.races` for the defender.
+        sd:
+          type: integer
+          description: Index into `BattleReport.ships` for the defender's group.
+        x:
+          type: boolean
+          description: True when the defender ship was destroyed by this shot.
     IncomingGroup:
       type: object
       description: An identified ship group inbound toward a planet of this race.

game/openapi_contract_test.go

@@ -58,6 +58,20 @@ func TestGameOpenAPISpecFreezesResponseSchemas(t *testing.T) {
 			status:  http.StatusOK,
 			wantRef: "#/components/schemas/StateResponse",
 		},
+		{
+			name:    "put order",
+			path:    "/api/v1/order",
+			method:  http.MethodPut,
+			status:  http.StatusAccepted,
+			wantRef: "#/components/schemas/UserGamesOrder",
+		},
+		{
+			name:    "get order",
+			path:    "/api/v1/order",
+			method:  http.MethodGet,
+			status:  http.StatusOK,
+			wantRef: "#/components/schemas/UserGamesOrder",
+		},
 		{
 			name:    "healthz probe",
 			path:    "/healthz",
@@ -65,6 +79,13 @@ func TestGameOpenAPISpecFreezesResponseSchemas(t *testing.T) {
 			status:  http.StatusOK,
 			wantRef: "#/components/schemas/HealthzResponse",
 		},
+		{
+			name:    "get battle",
+			path:    "/api/v1/battle/{turn}/{uuid}",
+			method:  http.MethodGet,
+			status:  http.StatusOK,
+			wantRef: "#/components/schemas/BattleReport",
+		},
 	}
 
 	for _, tt := range tests {
@@ -77,6 +98,86 @@ func TestGameOpenAPISpecFreezesResponseSchemas(t *testing.T) {
 	}
 }
 
+func TestGameOpenAPISpecFreezesEmptyResponses(t *testing.T) {
+	t.Parallel()
+
+	doc := loadOpenAPISpec(t)
+
+	tests := []struct {
+		name   string
+		path   string
+		method string
+		status int
+	}{
+		{
+			name:   "command accepted",
+			path:   "/api/v1/command",
+			method: http.MethodPut,
+			status: http.StatusAccepted,
+		},
+		{
+			name:   "get order no content",
+			path:   "/api/v1/order",
+			method: http.MethodGet,
+			status: http.StatusNoContent,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+
+			operation := getOpenAPIOperation(t, doc, tt.path, tt.method)
+			require.NotNil(t, operation.Responses, "operation must declare responses")
+			response := operation.Responses.Status(tt.status)
+			require.NotNil(t, response, "operation must declare %d response", tt.status)
+			require.NotNil(t, response.Value, "%d response must have a value", tt.status)
+			require.Empty(t, response.Value.Content, "%d response must carry no body", tt.status)
+		})
+	}
+}
+
+func TestGameOpenAPISpecFreezesUserGamesOrder(t *testing.T) {
+	t.Parallel()
+
+	doc := loadOpenAPISpec(t)
+	schema := componentSchemaRef(t, doc, "UserGamesOrder")
+
+	assertRequiredFields(t, schema, "game_id", "updatedAt", "cmd")
+
+	gameIDSchema := schema.Value.Properties["game_id"]
+	require.NotNil(t, gameIDSchema, "UserGamesOrder.game_id schema must exist")
+	require.Equal(t, "uuid", gameIDSchema.Value.Format, "UserGamesOrder.game_id format must be uuid")
+
+	updatedAtSchema := schema.Value.Properties["updatedAt"]
+	require.NotNil(t, updatedAtSchema, "UserGamesOrder.updatedAt schema must exist")
+	require.True(t, updatedAtSchema.Value.Type.Is("integer"), "UserGamesOrder.updatedAt must be integer")
+	require.Equal(t, "int64", updatedAtSchema.Value.Format, "UserGamesOrder.updatedAt format must be int64")
+
+	cmdSchema := schema.Value.Properties["cmd"]
+	require.NotNil(t, cmdSchema, "UserGamesOrder.cmd schema must exist")
+	require.True(t, cmdSchema.Value.Type.Is("array"), "UserGamesOrder.cmd must be array")
+	require.NotNil(t, cmdSchema.Value.Items, "UserGamesOrder.cmd items must be defined")
+	assertSchemaRef(t, cmdSchema.Value.Items, "#/components/schemas/Command", "UserGamesOrder.cmd items schema")
+}
+
+func TestGameOpenAPISpecFreezesGetOrderOperation(t *testing.T) {
+	t.Parallel()
+
+	doc := loadOpenAPISpec(t)
+	operation := getOpenAPIOperation(t, doc, "/api/v1/order", http.MethodGet)
+
+	require.Equal(t, "getOrder", operation.OperationID, "GET /api/v1/order operation id")
+
+	paramRefs := make(map[string]bool)
+	for _, p := range operation.Parameters {
+		require.NotNil(t, p.Value, "parameter must have value")
+		paramRefs[p.Ref] = true
+	}
+	require.True(t, paramRefs["#/components/parameters/PlayerParam"], "GET /api/v1/order must reference PlayerParam")
+	require.True(t, paramRefs["#/components/parameters/TurnParam"], "GET /api/v1/order must reference TurnParam")
+}
+
 func TestGameOpenAPISpecFreezesInitRequest(t *testing.T) {
 	t.Parallel()
 
@@ -177,6 +278,71 @@ func TestGameOpenAPISpecFreezesCommandRequest(t *testing.T) {
 	require.Equal(t, uint64(1), cmdSchema.Value.MinItems, "CommandRequest.cmd minItems must be 1")
 }
 
+func TestGameOpenAPISpecFreezesGetBattleOperation(t *testing.T) {
+	t.Parallel()
+
+	doc := loadOpenAPISpec(t)
+	operation := getOpenAPIOperation(t, doc, "/api/v1/battle/{turn}/{uuid}", http.MethodGet)
+
+	require.Equal(t, "getBattle", operation.OperationID, "GET /api/v1/battle/{turn}/{uuid} operation id")
+
+	paramRefs := make(map[string]bool)
+	for _, p := range operation.Parameters {
+		require.NotNil(t, p.Value, "parameter must have value")
+		paramRefs[p.Ref] = true
+	}
+	require.True(t, paramRefs["#/components/parameters/BattleTurnParam"], "GET /api/v1/battle/{turn}/{uuid} must reference BattleTurnParam")
+	require.True(t, paramRefs["#/components/parameters/BattleIDParam"], "GET /api/v1/battle/{turn}/{uuid} must reference BattleIDParam")
+
+	require.NotNil(t, operation.Responses, "operation must declare responses")
+	notFound := operation.Responses.Status(http.StatusNotFound)
+	require.NotNil(t, notFound, "operation must declare 404 response")
+	require.NotNil(t, notFound.Value, "404 response must have a value")
+}
+
+func TestGameOpenAPISpecFreezesBattleReport(t *testing.T) {
+	t.Parallel()
+
+	doc := loadOpenAPISpec(t)
+
+	reportSchema := componentSchemaRef(t, doc, "BattleReport")
+	assertRequiredFields(t, reportSchema, "id", "planet", "planetName", "races", "ships", "protocol")
+
+	groupSchema := componentSchemaRef(t, doc, "BattleReportGroup")
+	assertRequiredFields(t, groupSchema, "race", "className", "tech", "num", "numLeft", "loadType", "loadQuantity", "inBattle")
+
+	actionSchema := componentSchemaRef(t, doc, "BattleActionReport")
+	assertRequiredFields(t, actionSchema, "a", "sa", "d", "sd", "x")
+
+	protocolSchema := reportSchema.Value.Properties["protocol"]
+	require.NotNil(t, protocolSchema, "BattleReport.protocol schema must exist")
+	require.True(t, protocolSchema.Value.Type.Is("array"), "BattleReport.protocol must be array")
+	require.NotNil(t, protocolSchema.Value.Items, "BattleReport.protocol items must be defined")
+	assertSchemaRef(t, protocolSchema.Value.Items, "#/components/schemas/BattleActionReport", "BattleReport.protocol items schema")
+
+	shipsSchema := reportSchema.Value.Properties["ships"]
+	require.NotNil(t, shipsSchema, "BattleReport.ships schema must exist")
+	require.True(t, shipsSchema.Value.Type.Is("object"), "BattleReport.ships must be object")
+	require.NotNil(t, shipsSchema.Value.AdditionalProperties.Schema, "BattleReport.ships additionalProperties must be a schema")
+	assertSchemaRef(t, shipsSchema.Value.AdditionalProperties.Schema, "#/components/schemas/BattleReportGroup", "BattleReport.ships additionalProperties schema")
+}
+
+func TestGameOpenAPISpecFreezesBattleSummary(t *testing.T) {
+	t.Parallel()
+
+	doc := loadOpenAPISpec(t)
+
+	summary := componentSchemaRef(t, doc, "BattleSummary")
+	assertRequiredFields(t, summary, "id", "planet", "shots")
+
+	report := componentSchemaRef(t, doc, "Report")
+	battle := report.Value.Properties["battle"]
+	require.NotNil(t, battle, "Report.battle schema must exist")
+	require.True(t, battle.Value.Type.Is("array"), "Report.battle must be array")
+	require.NotNil(t, battle.Value.Items, "Report.battle items must be defined")
+	assertSchemaRef(t, battle.Value.Items, "#/components/schemas/BattleSummary", "Report.battle items schema")
+}
+
 func TestGameOpenAPISpecHealthzStatusEnum(t *testing.T) {
 	t.Parallel()
 

gateway/Dockerfile

@@ -1,9 +1,9 @@
 # syntax=docker/dockerfile:1.7
 
 # Build context is the workspace root (galaxy/), not the gateway/
-# subdirectory, because the gateway module pulls galaxy/{backend,model,
-# redisconn,transcoder} through the go.work replace directives. Build
-# with:
+# subdirectory, because the gateway module pulls
+# galaxy/{backend,core,model,redisconn,transcoder} through the
+# go.work replace directives. Build with:
 #
 #     docker build -t galaxy/gateway:integration -f gateway/Dockerfile .
 
@@ -23,6 +23,7 @@ COPY pkg/redisconn/  ./pkg/redisconn/
 COPY pkg/schema/     ./pkg/schema/
 COPY pkg/transcoder/ ./pkg/transcoder/
 COPY pkg/util/       ./pkg/util/
+COPY ui/core/        ./ui/core/
 COPY backend/        ./backend/
 COPY gateway/        ./gateway/
 
@@ -41,6 +42,7 @@ use (
 	./pkg/schema
 	./pkg/transcoder
 	./pkg/util
+	./ui/core
 )
 
 replace (
@@ -53,6 +55,7 @@ replace (
 	galaxy/schema v0.0.0     => ./pkg/schema
 	galaxy/transcoder v0.0.0 => ./pkg/transcoder
 	galaxy/util v0.0.0       => ./pkg/util
+	galaxy/core v0.0.0       => ./ui/core
 )
 EOF
 

gateway/PLAN.md

@@ -1,552 +0,0 @@
-# Edge Gateway Implementation Plan
-
-This plan has been already implemented and stays here for historical reasons.
-
-It should NOT be threated as source of truth for service functionality.
-
----
-
-## Summary
-
-This plan breaks implementation into small, reviewable phases.
-Each phase has a single primary goal, clear deliverables, explicit dependencies,
-acceptance criteria, and focused tests.
-
-The intended v1 architecture is:
-
-- unauthenticated public ingress over REST/JSON;
-- authenticated ingress over gRPC on HTTP/2;
-- FlatBuffers payloads for authenticated business commands;
-- protobuf-based gRPC control envelopes;
-- authenticated server-streaming push through gRPC;
-- separate public traffic classes and isolated anti-abuse counters.
-
-## Assumptions and Defaults
-
-- `message_type` is the stable downstream routing key.
-- `protocol_version` covers transport and envelope compatibility, not business
-  payload schema compatibility.
-- FlatBuffers are used for business payload bytes only.
-- Phase 3 public auth uses a challenge-token REST flow:
-  `send-email-code(email) -> challenge_id` and
-  `confirm-email-code(challenge_id, code, client_public_key) -> device_session_id`.
-- Phase 3 uses a consumer-side `AuthServiceClient` inside `gateway`; the
-  default process wiring keeps public auth routes mounted and returns
-  `503 service_unavailable` until a concrete upstream adapter is added.
-- Browser bootstrap and asset traffic are within gateway scope, even when backed
-  by a pluggable proxy or handler.
-- Long-polling is out of scope for v1.
-
-## ~~Phase 1.~~ Module Skeleton
-
-Status: implemented.
-
-Goal: create the runnable gateway process skeleton.
-
-Artifacts:
-
-- `cmd/gateway`
-- `internal/app`
-- base configuration types
-- startup and shutdown wiring
-
-Dependencies: none.
-
-Acceptance criteria:
-
-- the process starts with config;
-- the process shuts down cleanly on signal;
-- lifecycle wiring is testable.
-
-Targeted tests:
-
-- startup with valid config;
-- shutdown without leaked goroutines.
-
-## ~~Phase 2.~~ Public REST Server
-
-Status: implemented.
-
-Goal: add the unauthenticated HTTP server shell.
-
-Artifacts:
-
-- public REST listener
-- `GET /healthz`
-- `GET /readyz`
-- base error serialization
-- request classification hook
-
-Dependencies: Phase 1.
-
-Acceptance criteria:
-
-- health endpoints respond deterministically;
-- public requests are classified at least into `public_auth` and `browser_*`.
-
-Targeted tests:
-
-- health endpoint responses;
-- request classification smoke tests.
-
-## ~~Phase 3.~~ Public Auth REST Handlers
-
-Status: implemented.
-
-Goal: expose unauthenticated auth commands through REST/JSON.
-
-Artifacts:
-
-- `POST /api/v1/public/auth/send-email-code`
-- `POST /api/v1/public/auth/confirm-email-code`
-- request and response DTOs
-- adapter calls into `AuthServiceClient`
-
-Dependencies: Phase 2.
-
-Acceptance criteria:
-
-- no session authentication is required for these routes;
-- handlers delegate only through the auth service adapter.
-
-Targeted tests:
-
-- success and validation errors for both routes;
-- no session lookup on public auth paths.
-
-## ~~Phase 4.~~ Public Traffic Classification
-
-Status: implemented.
-
-Goal: isolate public traffic into stable anti-abuse classes.
-
-Artifacts:
-
-- `PublicTrafficClassifier`
-- classes `public_auth`, `browser_bootstrap`, `browser_asset`, `public_misc`
-- isolated rate-limit bucket keys
-
-Dependencies: Phase 2.
-
-Acceptance criteria:
-
-- browser traffic does not share buckets with public auth;
-- auth counters remain unaffected by asset bursts.
-
-Targeted tests:
-
-- per-class routing tests;
-- bucket isolation tests.
-
-## ~~Phase 5.~~ Public REST Anti-Abuse
-
-Status: implemented.
-
-Goal: add coarse protection to unauthenticated REST traffic.
-
-Artifacts:
-
-- body size limits
-- method allow-lists
-- malformed request counters
-- per-class rate-limit thresholds
-
-Dependencies: Phase 4.
-
-Acceptance criteria:
-
-- first-load browser bursts are not marked hostile because of burst pattern
-  alone;
-- malformed or oversized requests are rejected predictably.
-
-Targeted tests:
-
-- bootstrap burst stays outside auth abuse counters;
-- invalid methods and oversized bodies are rejected.
-
-## ~~Phase 6.~~ gRPC Server and Public Contracts
-
-Status: implemented.
-
-Goal: bring up authenticated transport over gRPC and HTTP/2.
-
-Artifacts:
-
-- gRPC listener
-- protobuf service definitions
-- `ExecuteCommand`
-- `SubscribeEvents`
-
-Dependencies: Phase 1.
-
-Acceptance criteria:
-
-- unary and server-streaming RPCs are reachable;
-- the server runs only over HTTP/2.
-
-Targeted tests:
-
-- unary transport smoke test;
-- stream transport smoke test.
-
-## ~~Phase 7.~~ Envelope Parsing and Protocol Gate
-
-Status: implemented.
-
-Goal: validate the gRPC control envelope before security checks continue.
-
-Artifacts:
-
-- envelope parser
-- required-field validation
-- protocol version gate
-
-Dependencies: Phase 6.
-
-Acceptance criteria:
-
-- unsupported or malformed envelopes are rejected before routing.
-
-Targeted tests:
-
-- missing field rejection;
-- unsupported `protocol_version` rejection.
-
-## ~~Phase 8.~~ Session Cache Lookup
-
-Status: implemented.
-
-Goal: resolve authenticated identity from cache.
-
-Artifacts:
-
-- `SessionCache`
-- session lookup pipeline
-- revoked versus active session handling
-
-Dependencies: Phase 7.
-
-Acceptance criteria:
-
-- unknown and revoked sessions are blocked before signature verification.
-
-Targeted tests:
-
-- cache hit with active session;
-- cache miss reject;
-- revoked session reject.
-
-## ~~Phase 9.~~ Payload Hash and Signing Input
-
-Status: implemented.
-
-Goal: verify payload integrity before signature verification.
-
-Artifacts:
-
-- `payload_hash` verification
-- canonical signing input builder
-
-Dependencies: Phase 8.
-
-Acceptance criteria:
-
-- changing payload bytes or envelope fields breaks the signing input.
-
-Targeted tests:
-
-- payload hash mismatch reject;
-- canonical bytes differ when signed fields change.
-
-## ~~Phase 10.~~ Client Signature Verification
-
-Status: implemented.
-
-Goal: authenticate the request origin using the session public key.
-
-Artifacts:
-
-- signature verifier
-- deterministic auth reject mapping
-
-Dependencies: Phase 9.
-
-Acceptance criteria:
-
-- wrong key and invalid signature produce stable rejects.
-
-Targeted tests:
-
-- success case with valid signature;
-- bad signature reject;
-- wrong-key reject.
-
-## ~~Phase 11.~~ Freshness and Anti-Replay
-
-Status: implemented.
-
-Goal: enforce transport freshness and replay protection.
-
-Artifacts:
-
-- timestamp freshness window
-- `ReplayStore`
-- replay reservation and rejection logic
-
-Dependencies: Phase 10.
-
-Acceptance criteria:
-
-- stale requests and duplicate `request_id` values are rejected.
-
-Targeted tests:
-
-- stale timestamp reject;
-- replay reject for same session and request ID;
-- distinct sessions do not collide.
-
-## ~~Phase 12.~~ Authenticated Rate Limits and Policy
-
-Status: implemented.
-
-Goal: apply edge policy after transport authenticity is established.
-
-Artifacts:
-
-- rate-limit keys for IP, session, user, and message class
-- authenticated policy evaluation hook
-
-Dependencies: Phase 11.
-
-Acceptance criteria:
-
-- authenticated buckets are independent from public REST buckets.
-
-Targeted tests:
-
-- per-dimension throttling;
-- bucket isolation from public traffic.
-
-## ~~Phase 13.~~ Internal Authenticated Command and Routing
-
-Status: implemented.
-Note: delivered together with Phase 14 signed unary responses.
-
-Goal: forward only verified context to downstream services.
-
-Artifacts:
-
-- `AuthenticatedCommand`
-- `DownstreamRouter`
-- `DownstreamClient`
-
-Dependencies: Phase 12.
-
-Acceptance criteria:
-
-- downstream services receive verified context only;
-- raw transport details do not leak as authoritative input.
-
-Targeted tests:
-
-- route selection by `message_type`;
-- downstream receives the expected authenticated context.
-
-## ~~Phase 14.~~ Signed Unary Responses
-
-Status: implemented as part of Phase 13 delivery.
-
-Goal: return verifiable server responses to authenticated clients.
-
-Artifacts:
-
-- response envelope builder
-- payload hash generation
-- `ResponseSigner`
-
-Dependencies: Phase 13.
-
-Acceptance criteria:
-
-- unary responses always carry the original `request_id`, `payload_hash`, and
-  server signature.
-
-Targeted tests:
-
-- response correlation test;
-- server signature generation test.
-
-## ~~Phase 15.~~ Session Update and Revocation Events
-
-Status: implemented.
-
-Goal: keep gateway session state current without synchronous hot-path lookups.
-
-Artifacts:
-
-- `EventSubscriber`
-- session update handlers
-- session revoke handlers
-
-Dependencies: Phase 8.
-
-Acceptance criteria:
-
-- session updates change gateway behavior without per-request sync calls to the
-  auth service.
-
-Targeted tests:
-
-- cache update from event;
-- revocation event invalidates cached session.
-
-## ~~Phase 16.~~ Authenticated Push Stream
-
-Status: implemented.
-
-Goal: open a verified server-streaming channel for client-facing delivery.
-
-Artifacts:
-
-- `SubscribeEvents` handler
-- stream binding to `user_id` and `device_session_id`
-- initial server time event
-
-Dependencies: Phase 15.
-
-Acceptance criteria:
-
-- the stream opens only after the full auth pipeline succeeds.
-
-Targeted tests:
-
-- authorized stream open;
-- rejected stream open for invalid session;
-- first event contains server time.
-
-## ~~Phase 17.~~ Event Fan-Out
-
-Status: implemented.
-
-Goal: deliver client-facing events from internal pub/sub to active streams.
-
-Artifacts:
-
-- `PushHub`
-- event fan-out logic
-- user and session targeting rules
-
-Dependencies: Phase 16.
-
-Acceptance criteria:
-
-- events are delivered to the correct active streams only.
-
-Targeted tests:
-
-- single-session delivery;
-- multi-device delivery for one user;
-- unrelated sessions do not receive the event.
-
-## ~~Phase 18.~~ Revocation-Driven Stream Teardown
-
-Status: implemented.
-
-Goal: terminate active delivery channels when a session is revoked.
-
-Artifacts:
-
-- stream teardown on revoke
-- connection cleanup logic
-
-Dependencies: Phase 17.
-
-Acceptance criteria:
-
-- revocation blocks new unary requests and closes active streams for the same
-  session.
-
-Targeted tests:
-
-- revoke closes active stream;
-- revoked session cannot reopen the stream.
-
-## ~~Phase 19.~~ Observability and Shutdown Hardening
-
-Status: implemented.
-Note: delivered with `zap` structured logging, OpenTelemetry tracing and
-metrics, the optional private admin `/metrics` listener, timeout budgets, and
-shutdown-driven push-stream teardown.
-
-Goal: make the service operable in production.
-
-Artifacts:
-
-- structured logs
-- metrics
-- trace propagation
-- timeout budgets
-- graceful shutdown for unary and streaming traffic
-
-Dependencies: Phase 18.
-
-Acceptance criteria:
-
-- shutdown is deterministic;
-- logs and metrics expose stable edge outcomes without leaking secrets.
-
-Targeted tests:
-
-- shutdown closes listeners and active streams;
-- secret and signature values are not logged.
-
-## ~~Phase 20.~~ Acceptance Pass
-
-Status: implemented.
-Note: acceptance pass reconciled README/OpenAPI/root architecture
-documentation, fixed the documented public-auth projected-error contract, and
-added focused regression coverage including OpenAPI validation.
-
-Goal: reconcile implementation, documentation, and regression coverage.
-
-Artifacts:
-
-- updated README and PLAN
-- final protocol and interface review
-- focused regression test run
-
-Dependencies: Phases 1 through 19.
-
-Acceptance criteria:
-
-- implementation matches documented contracts and ordering guarantees;
-- docs describe the actual gateway behavior.
-
-Targeted tests:
-
-- run focused package tests for gateway packages;
-- rerun cross-cutting regression scenarios.
-
-## Cross-Cutting Regression Scenarios
-
-- `send_email_code` and `confirm_email_code` are available without session auth
-  and are still limited by public auth policy.
-- Public browser bootstrap and asset bursts do not increase auth abuse counters
-  and are not rejected as hostile because of intensity alone.
-- Any gRPC command without a valid session is rejected before routing.
-- Unknown and revoked sessions are handled predictably and consistently where
-  policy requires identical behavior.
-- Signature verification fails when `payload_bytes`, `payload_hash`,
-  `message_type`, `request_id`, or the signing key changes.
-- `payload_hash` is verified before downstream execution.
-- Requests outside the freshness window are rejected.
-- Reused `request_id` values are rejected within the session replay window.
-- Public REST and authenticated gRPC traffic use independent buckets and
-  independent abuse telemetry.
-- Downstream services receive `AuthenticatedCommand`, not raw REST or gRPC
-  transport requests.
-- Unary responses preserve `request_id` correlation and are server-signed.
-- Streaming connections open only after the auth pipeline and close on revoke.
-- Session cache updates from events change gateway behavior without synchronous
-  auth-service lookups per request.
-- Graceful shutdown terminates unary and streaming traffic cleanly.

gateway/README.md

@@ -87,7 +87,15 @@ The gateway exposes two external transport classes.
 | Transport | Audience | Authentication | Payload format | Primary use |
 | --- | --- | --- | --- | --- |
 | REST/JSON | Public, unauthenticated traffic | No device session auth | JSON | Health checks, public auth commands, and browser/bootstrap traffic |
-| gRPC over HTTP/2 | Authenticated clients only | Required | FlatBuffers payload inside protobuf control envelope | Verified commands and push delivery |
+| Connect / gRPC / gRPC-Web over HTTP/2 (h2c) | Authenticated clients only | Required | FlatBuffers payload inside protobuf control envelope | Verified commands and push delivery |
+
+The authenticated edge listener is built on
+[`connectrpc.com/connect`](https://connectrpc.com/) and natively serves
+the Connect, gRPC, and gRPC-Web protocols on a single HTTP/2 cleartext
+(`h2c`) port. Browser clients use `@connectrpc/connect-web`; native
+clients can use either Connect or raw gRPC framing against the same
+listener. Production TLS termination happens upstream of the gateway,
+matching the previous gRPC-only deployment posture.
 
 ### Public REST Surface
 
@@ -181,16 +189,21 @@ The endpoint exposes metrics in the Prometheus text exposition format described
 in the official Prometheus documentation:
 <https://prometheus.io/docs/instrumenting/exposition_formats/>.
 
-### Authenticated gRPC Surface
+### Authenticated Edge Surface
 
-All authenticated client requests use HTTP/2 and gRPC.
-The listener address is configured by `GATEWAY_AUTHENTICATED_GRPC_ADDR`.
-Inbound authenticated gRPC connection setup is bounded by
+All authenticated client requests use HTTP/2 cleartext (`h2c`) and are
+served through `connectrpc.com/connect`, which natively accepts the
+Connect, gRPC, and gRPC-Web protocols on the same listener.
+The listener address is configured by `GATEWAY_AUTHENTICATED_GRPC_ADDR`
+(the env-var name retains the historical `GRPC` infix for operational
+stability — it labels the authenticated edge tier, not the wire
+protocol).
+Inbound authenticated edge connection setup is bounded by
 `GATEWAY_AUTHENTICATED_GRPC_CONNECTION_TIMEOUT`, which defaults to `5s`.
 The accepted client timestamp skew is configured by
 `GATEWAY_AUTHENTICATED_GRPC_FRESHNESS_WINDOW` and defaults to `5m`.
 
-The public gRPC service exposes two methods:
+The public service exposes two methods:
 
 - `ExecuteCommand(ExecuteCommandRequest) returns (ExecuteCommandResponse)`
 - `SubscribeEvents(SubscribeEventsRequest) returns (stream GatewayEvent)`
@@ -200,9 +213,12 @@ The gateway routes the request downstream by `message_type` after transport
 verification succeeds.
 Downstream unary execution is bounded by
 `GATEWAY_AUTHENTICATED_DOWNSTREAM_TIMEOUT`, which defaults to `5s`.
-When that timeout expires, the gateway preserves the authenticated gRPC
-contract and returns gRPC `UNAVAILABLE` with message
-`downstream service is unavailable`.
+When that timeout expires, the gateway preserves the authenticated edge
+contract and returns `UNAVAILABLE` with message
+`downstream service is unavailable`. Reject codes are documented using
+their gRPC names (`INVALID_ARGUMENT`, `UNAUTHENTICATED`, …); the same
+codes flow back to Connect clients as the corresponding `connect.Code*`
+values.
 
 `SubscribeEvents` is an authenticated server-streaming RPC.
 It binds the stream to `user_id` and `device_session_id` and starts by sending
@@ -211,8 +227,9 @@ a signed service event that includes the current server time in milliseconds.
 The v1 protobuf contract lives in
 `proto/galaxy/gateway/v1/edge_gateway.proto` under package
 `galaxy.gateway.v1` and service `EdgeGateway`.
-Generated Go bindings are committed under `proto/galaxy/gateway/v1/` and are
-regenerated with:
+Generated Go bindings are committed under
+`proto/galaxy/gateway/v1/` (gRPC stubs and `gatewayv1connect/` Connect
+handlers) and are regenerated with:
 
 ```bash
 buf generate
@@ -286,8 +303,8 @@ affected stream is closed with gRPC `RESOURCE_EXHAUSTED` and message
 same `device_session_id` was revoked, every active `SubscribeEvents` stream
 bound to that exact session is closed with gRPC `FAILED_PRECONDITION` and
 message `device session is revoked`. During gateway shutdown, the in-memory
-push hub is closed before gRPC graceful stop, and every active
-`SubscribeEvents` stream is terminated with gRPC `UNAVAILABLE` and message
+push hub is closed before HTTP graceful stop, and every active
+`SubscribeEvents` stream is terminated with `UNAVAILABLE` and message
 `gateway is shutting down`.
 Authenticated anti-abuse budgets are configured by the
 `GATEWAY_AUTHENTICATED_GRPC_ANTI_ABUSE_*` environment variables.
@@ -352,6 +369,15 @@ The current direct `Gateway -> User` self-service boundary uses that pattern:
   - `user.games.command`
   - `user.games.order`
   - `user.games.report`
+  - `lobby.my.games.list`
+  - `lobby.my.applications.list`
+  - `lobby.my.invites.list`
+  - `lobby.public.games.list`
+  - `lobby.game.create`
+  - `lobby.game.open-enrollment`
+  - `lobby.application.submit`
+  - `lobby.invite.redeem`
+  - `lobby.invite.decline`
 - external payloads and responses:
   - FlatBuffers
 - internal downstream transport:
@@ -359,6 +385,12 @@ The current direct `Gateway -> User` self-service boundary uses that pattern:
 - business error projection:
   - gateway `result_code`
   - FlatBuffers error payload mirroring User Service `code` and `message`
+  - User Service `code` values pass through verbatim as `result_code`
+    via `projectUserBackendError`; known non-`ok` codes that clients
+    branch on include `turn_already_closed` (Phase 25 turn cutoff,
+    HTTP 409 from `Orders` / `Commands` while the runtime is in
+    `generation_in_progress`) and `game_paused` (Phase 25 auto-pause,
+    HTTP 409 while the game is in `paused` / `finished` / `removed`).
 
 The request envelope version literal is `v1`.
 `payload_hash` is the raw 32-byte SHA-256 digest of `payload_bytes`.
@@ -851,9 +883,9 @@ subscribers, and telemetry runtime.
 
 `GATEWAY_SHUTDOWN_TIMEOUT` configures the per-component graceful shutdown
 budget and defaults to `5s`.
-During authenticated gRPC shutdown, the in-memory `PushHub` closes active
-streams before gRPC graceful stop, so active `SubscribeEvents` calls terminate
-with gRPC `UNAVAILABLE` and message `gateway is shutting down`.
+During authenticated edge shutdown, the in-memory `PushHub` closes active
+streams before HTTP graceful stop, so active `SubscribeEvents` calls terminate
+with `UNAVAILABLE` and message `gateway is shutting down`.
 
 ## Recommended Package Layout
 

gateway/authn/parity_with_ui_core_test.go

@@ -0,0 +1,227 @@
+package authn_test
+
+import (
+	"crypto/ed25519"
+	"crypto/rand"
+	"crypto/sha256"
+	"encoding/base64"
+	"testing"
+
+	"galaxy/core/canon"
+	"galaxy/core/keypair"
+	"galaxy/gateway/authn"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func sha256Of(payload []byte) []byte {
+	sum := sha256.Sum256(payload)
+	return sum[:]
+}
+
+// TestParityWithUICoreCanonicalBytes proves that the gateway-side
+// authn package and the client-side ui/core canon package produce the
+// exact same canonical signing input for every v1 envelope. Any drift
+// here means a client signature would be silently rejected by the
+// gateway (or vice versa).
+func TestParityWithUICoreCanonicalBytes(t *testing.T) {
+	t.Parallel()
+
+	t.Run("request", func(t *testing.T) {
+		t.Parallel()
+
+		gatewayFields := authn.RequestSigningFields{
+			ProtocolVersion: "v1",
+			DeviceSessionID: "device-session-parity",
+			MessageType:     "user.games.command",
+			TimestampMS:     1_700_000_000_000,
+			RequestID:       "request-parity",
+			PayloadHash:     sha256Of([]byte("payload")),
+		}
+		clientFields := canon.RequestSigningFields{
+			ProtocolVersion: gatewayFields.ProtocolVersion,
+			DeviceSessionID: gatewayFields.DeviceSessionID,
+			MessageType:     gatewayFields.MessageType,
+			TimestampMS:     gatewayFields.TimestampMS,
+			RequestID:       gatewayFields.RequestID,
+			PayloadHash:     gatewayFields.PayloadHash,
+		}
+
+		assert.Equal(t,
+			authn.BuildRequestSigningInput(gatewayFields),
+			canon.BuildRequestSigningInput(clientFields))
+	})
+
+	t.Run("response", func(t *testing.T) {
+		t.Parallel()
+
+		gatewayFields := authn.ResponseSigningFields{
+			ProtocolVersion: "v1",
+			RequestID:       "request-parity",
+			TimestampMS:     1_700_000_000_500,
+			ResultCode:      "ok",
+			PayloadHash:     sha256Of([]byte("response-payload")),
+		}
+		clientFields := canon.ResponseSigningFields{
+			ProtocolVersion: gatewayFields.ProtocolVersion,
+			RequestID:       gatewayFields.RequestID,
+			TimestampMS:     gatewayFields.TimestampMS,
+			ResultCode:      gatewayFields.ResultCode,
+			PayloadHash:     gatewayFields.PayloadHash,
+		}
+
+		assert.Equal(t,
+			authn.BuildResponseSigningInput(gatewayFields),
+			canon.BuildResponseSigningInput(clientFields))
+	})
+
+	t.Run("event", func(t *testing.T) {
+		t.Parallel()
+
+		gatewayFields := authn.EventSigningFields{
+			EventType:   "gateway.server_time",
+			EventID:     "evt-parity",
+			TimestampMS: 1_700_000_001_000,
+			RequestID:   "request-parity",
+			TraceID:     "trace-parity",
+			PayloadHash: sha256Of([]byte("event-payload")),
+		}
+		clientFields := canon.EventSigningFields{
+			EventType:   gatewayFields.EventType,
+			EventID:     gatewayFields.EventID,
+			TimestampMS: gatewayFields.TimestampMS,
+			RequestID:   gatewayFields.RequestID,
+			TraceID:     gatewayFields.TraceID,
+			PayloadHash: gatewayFields.PayloadHash,
+		}
+
+		assert.Equal(t,
+			authn.BuildEventSigningInput(gatewayFields),
+			canon.BuildEventSigningInput(clientFields))
+	})
+}
+
+// TestParityRequestSignedByUICoreAcceptedByGateway proves that a
+// request the client signs with `keypair.Sign` is accepted by the
+// gateway's `authn.VerifyRequestSignature`. This is the acceptance
+// criterion from `ui/PLAN.md` Phase 3.
+func TestParityRequestSignedByUICoreAcceptedByGateway(t *testing.T) {
+	t.Parallel()
+
+	privateKey, publicKey, err := keypair.Generate(rand.Reader)
+	require.NoError(t, err)
+
+	clientFields := canon.RequestSigningFields{
+		ProtocolVersion: "v1",
+		DeviceSessionID: "device-session-parity",
+		MessageType:     "user.account.get",
+		TimestampMS:     1_700_000_000_000,
+		RequestID:       "request-parity",
+		PayloadHash:     sha256Of([]byte("payload")),
+	}
+	signature, err := keypair.Sign(privateKey, canon.BuildRequestSigningInput(clientFields))
+	require.NoError(t, err)
+
+	encodedKey, err := keypair.MarshalPublicKey(publicKey)
+	require.NoError(t, err)
+
+	gatewayFields := authn.RequestSigningFields{
+		ProtocolVersion: clientFields.ProtocolVersion,
+		DeviceSessionID: clientFields.DeviceSessionID,
+		MessageType:     clientFields.MessageType,
+		TimestampMS:     clientFields.TimestampMS,
+		RequestID:       clientFields.RequestID,
+		PayloadHash:     clientFields.PayloadHash,
+	}
+
+	require.NoError(t,
+		authn.VerifyRequestSignature(encodedKey, signature, gatewayFields))
+}
+
+// TestParityResponseSignedByGatewayAcceptedByUICore proves that a
+// response signed by the gateway's `Ed25519ResponseSigner` is
+// accepted by the client's `canon.VerifyResponseSignature`. The
+// reverse acceptance criterion from `ui/PLAN.md` Phase 3.
+func TestParityResponseSignedByGatewayAcceptedByUICore(t *testing.T) {
+	t.Parallel()
+
+	_, privateKey, err := ed25519.GenerateKey(rand.Reader)
+	require.NoError(t, err)
+	signer, err := authn.NewEd25519ResponseSigner(privateKey)
+	require.NoError(t, err)
+
+	gatewayFields := authn.ResponseSigningFields{
+		ProtocolVersion: "v1",
+		RequestID:       "request-parity",
+		TimestampMS:     1_700_000_000_500,
+		ResultCode:      "ok",
+		PayloadHash:     sha256Of([]byte("response-payload")),
+	}
+	signature, err := signer.SignResponse(gatewayFields)
+	require.NoError(t, err)
+
+	clientFields := canon.ResponseSigningFields{
+		ProtocolVersion: gatewayFields.ProtocolVersion,
+		RequestID:       gatewayFields.RequestID,
+		TimestampMS:     gatewayFields.TimestampMS,
+		ResultCode:      gatewayFields.ResultCode,
+		PayloadHash:     gatewayFields.PayloadHash,
+	}
+
+	require.NoError(t,
+		canon.VerifyResponseSignature(signer.PublicKey(), signature, clientFields))
+}
+
+// TestParityEventSignedByGatewayAcceptedByUICore proves that a
+// stream event signed by the gateway's response signer (which signs
+// both responses and events with the same key) is accepted by the
+// client's `canon.VerifyEventSignature`.
+func TestParityEventSignedByGatewayAcceptedByUICore(t *testing.T) {
+	t.Parallel()
+
+	_, privateKey, err := ed25519.GenerateKey(rand.Reader)
+	require.NoError(t, err)
+	signer, err := authn.NewEd25519ResponseSigner(privateKey)
+	require.NoError(t, err)
+
+	gatewayFields := authn.EventSigningFields{
+		EventType:   "gateway.server_time",
+		EventID:     "evt-parity",
+		TimestampMS: 1_700_000_001_000,
+		RequestID:   "request-parity",
+		TraceID:     "trace-parity",
+		PayloadHash: sha256Of([]byte("event-payload")),
+	}
+	signature, err := signer.SignEvent(gatewayFields)
+	require.NoError(t, err)
+
+	clientFields := canon.EventSigningFields{
+		EventType:   gatewayFields.EventType,
+		EventID:     gatewayFields.EventID,
+		TimestampMS: gatewayFields.TimestampMS,
+		RequestID:   gatewayFields.RequestID,
+		TraceID:     gatewayFields.TraceID,
+		PayloadHash: gatewayFields.PayloadHash,
+	}
+
+	require.NoError(t,
+		canon.VerifyEventSignature(signer.PublicKey(), signature, clientFields))
+}
+
+// TestParityClientPublicKeyEncodingMatchesBackend proves that the
+// base64 encoding `keypair.MarshalPublicKey` produces is the exact
+// string form `authn.VerifyRequestSignature` expects when the
+// gateway reads a client public key out of session cache.
+func TestParityClientPublicKeyEncodingMatchesBackend(t *testing.T) {
+	t.Parallel()
+
+	_, publicKey, err := keypair.Generate(rand.Reader)
+	require.NoError(t, err)
+
+	encoded, err := keypair.MarshalPublicKey(publicKey)
+	require.NoError(t, err)
+
+	expected := base64.StdEncoding.EncodeToString(publicKey)
+	require.Equal(t, expected, encoded)
+}

gateway/buf.gen.yaml

@@ -9,3 +9,7 @@ plugins:
     out: proto
     opt:
       - paths=source_relative
+  - remote: buf.build/connectrpc/go:v1.19.2
+    out: proto
+    opt:
+      - paths=source_relative

gateway/docs/flows.md

@@ -75,6 +75,6 @@ sequenceDiagram
     Dispatcher->>Hub: RevokeDeviceSession or RevokeAllForUser
     Hub-->>Client: stream closes with FAILED_PRECONDITION
 
-    Note over Gateway,Hub: During shutdown the gateway closes PushHub before gRPC graceful stop.
+    Note over Gateway,Hub: During shutdown the gateway closes PushHub before HTTP graceful stop.
     Hub-->>Client: stream closes with UNAVAILABLE
 ```

gateway/docs/runbook.md

@@ -80,8 +80,8 @@ Shutdown behavior:
 - the per-component shutdown budget is controlled by
   `GATEWAY_SHUTDOWN_TIMEOUT`;
 - internal subscribers are stopped as part of application shutdown;
-- the in-memory `PushHub` is closed before gRPC graceful stop;
-- active `SubscribeEvents` streams terminate with gRPC `UNAVAILABLE` and
+- the in-memory `PushHub` is closed before HTTP graceful stop;
+- active `SubscribeEvents` streams terminate with `UNAVAILABLE` and
   message `gateway is shutting down`.
 
 During planned restarts:

gateway/docs/runtime.md

@@ -7,12 +7,12 @@ runtime dependencies.
 flowchart LR
     subgraph Clients
         Public["Public REST clients"]
-        Authd["Authenticated gRPC clients"]
+        Authd["Authenticated edge clients\n(Connect / gRPC / gRPC-Web)"]
     end
 
     subgraph Gateway["Edge Gateway process"]
         PublicHTTP["Public HTTP listener\n/healthz /readyz /api/v1/public/auth/*"]
-        AuthGRPC["Authenticated gRPC listener\nExecuteCommand / SubscribeEvents"]
+        AuthGRPC["Authenticated edge listener (h2c)\nConnect / gRPC / gRPC-Web\nExecuteCommand / SubscribeEvents"]
         AdminHTTP["Optional admin HTTP listener\n/metrics"]
         BackendREST["backendclient.RESTClient\nsessions + public auth + user/lobby"]
         BackendPush["backendclient.PushClient\nSubscribePush consumer"]
@@ -48,9 +48,13 @@ Notes:
 
 - `cmd/gateway` refuses startup when Redis connectivity, the backend endpoint,
   or the response signer is misconfigured.
-- Session lookup is synchronous: every authenticated gRPC request triggers one
+- Session lookup is synchronous: every authenticated edge request triggers one
   `GET /api/v1/internal/sessions/{id}` call to backend; there is no
   process-local projection.
+- The authenticated edge listener is built on `connectrpc.com/connect` and
+  natively serves the Connect, gRPC, and gRPC-Web protocols on a single
+  HTTP/2 cleartext (`h2c`) port. Browsers use Connect; native clients can
+  use either Connect or raw gRPC framing against the same listener.
 - `backendclient.PushClient` keeps a long-lived `Push.SubscribePush` stream
   open. The dispatcher converts inbound `pushv1.PushEvent` frames into either
   `PushHub.Publish` (for client events) or `PushHub.RevokeDeviceSession` /

gateway/go.mod

@@ -5,6 +5,8 @@ go 1.26.1
 require (
 	buf.build/gen/go/bufbuild/protovalidate/protocolbuffers/go v1.36.11-20260209202127-80ab13bee0bf.1
 	buf.build/go/protovalidate v1.1.3
+	connectrpc.com/connect v1.19.2
+	galaxy/core v0.0.0-00010101000000-000000000000
 	galaxy/redisconn v0.0.0-00010101000000-000000000000
 	github.com/alicebob/miniredis/v2 v2.37.0
 	github.com/getkin/kin-openapi v0.135.0
@@ -16,6 +18,7 @@ require (
 	github.com/stretchr/testify v1.11.1
 	go.opentelemetry.io/contrib/instrumentation/github.com/gin-gonic/gin/otelgin v0.68.0
 	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.67.0
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.68.0
 	go.opentelemetry.io/otel v1.43.0
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.43.0
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.43.0
@@ -25,6 +28,7 @@ require (
 	go.opentelemetry.io/otel/sdk/metric v1.43.0
 	go.opentelemetry.io/otel/trace v1.43.0
 	go.uber.org/zap v1.27.1
+	golang.org/x/net v0.53.0
 	golang.org/x/text v0.36.0
 	golang.org/x/time v0.15.0
 	google.golang.org/grpc v1.80.0
@@ -43,6 +47,7 @@ require (
 	github.com/cloudwego/base64x v0.1.6 // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
 	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
+	github.com/felixge/httpsnoop v1.0.4 // indirect
 	github.com/gabriel-vasile/mimetype v1.4.13 // indirect
 	github.com/gin-contrib/sse v1.1.1 // indirect
 	github.com/go-logr/logr v1.4.3 // indirect
@@ -94,7 +99,6 @@ require (
 	golang.org/x/arch v0.25.0 // indirect
 	golang.org/x/crypto v0.50.0 // indirect
 	golang.org/x/exp v0.0.0-20260410095643-746e56fc9e2f // indirect
-	golang.org/x/net v0.53.0 // indirect
 	golang.org/x/sys v0.43.0 // indirect
 	google.golang.org/genproto/googleapis/api v0.0.0-20260401024825-9d38bb4040a9 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20260420184626-e10c466a9529 // indirect
@@ -102,3 +106,5 @@ require (
 )
 
 replace galaxy/redisconn => ../pkg/redisconn
+
+replace galaxy/core => ../ui/core

gateway/go.sum

@@ -4,6 +4,8 @@ buf.build/go/protovalidate v1.1.3 h1:m2GVEgQWd7rk+vIoAZ+f0ygGjvQTuqPQapBBdcpWVPE
 buf.build/go/protovalidate v1.1.3/go.mod h1:9XIuohWz+kj+9JVn3WQneHA5LZP50mjvneZMnbLkiIE=
 cel.dev/expr v0.25.1 h1:1KrZg61W6TWSxuNZ37Xy49ps13NUovb66QLprthtwi4=
 cel.dev/expr v0.25.1/go.mod h1:hrXvqGP6G6gyx8UAHSHJ5RGk//1Oj5nXQ2NI02Nrsg4=
+connectrpc.com/connect v1.19.2 h1:McQ83FGdzL+t60peksi0gXC7MQ/iLKgLduAnThbM0mo=
+connectrpc.com/connect v1.19.2/go.mod h1:tN20fjdGlewnSFeZxLKb0xwIZ6ozc3OQs2hTXy4du9w=
 github.com/alicebob/miniredis/v2 v2.37.0 h1:RheObYW32G1aiJIj81XVt78ZHJpHonHLHW7OLIshq68=
 github.com/alicebob/miniredis/v2 v2.37.0/go.mod h1:TcL7YfarKPGDAthEtl5NBeHZfeUQj6OXMm/+iu5cLMM=
 github.com/antlr4-go/antlr/v4 v4.13.1 h1:SqQKkuVZ+zWkMMNkjy5FZe5mr5WURWnlpmOuzYWrPrQ=
@@ -34,6 +36,8 @@ github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1
 github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f h1:lO4WD4F/rVNCu3HqELle0jiPLLBs70cWOduZpkS1E78=
 github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f/go.mod h1:cuUVRXasLTGF7a8hSLbxyZXjz+1KgoB3wDUb6vlszIc=
+github.com/felixge/httpsnoop v1.0.4 h1:NFTV2Zj1bL4mc9sqWACXbQFVBBg2W3GPvqp8/ESS2Wg=
+github.com/felixge/httpsnoop v1.0.4/go.mod h1:m8KPJKqk1gH5J9DgRY2ASl2lWCfGKXixSwevea8zH2U=
 github.com/gabriel-vasile/mimetype v1.4.13 h1:46nXokslUBsAJE/wMsp5gtO500a4F3Nkz9Ufpk2AcUM=
 github.com/gabriel-vasile/mimetype v1.4.13/go.mod h1:d+9Oxyo1wTzWdyVUPMmXFvp4F9tea18J8ufA774AB3s=
 github.com/getkin/kin-openapi v0.135.0 h1:751SjYfbiwqukYuVjwYEIKNfrSwS5YpA7DZnKSwQgtg=
@@ -171,6 +175,8 @@ go.opentelemetry.io/contrib/instrumentation/github.com/gin-gonic/gin/otelgin v0.
 go.opentelemetry.io/contrib/instrumentation/github.com/gin-gonic/gin/otelgin v0.68.0/go.mod h1:MdHW7tLtkeGJnR4TyOrnd5D0zUGZQB1l84uHCe8hRpE=
 go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.67.0 h1:yI1/OhfEPy7J9eoa6Sj051C7n5dvpj0QX8g4sRchg04=
 go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.67.0/go.mod h1:NoUCKYWK+3ecatC4HjkRktREheMeEtrXoQxrqYFeHSc=
+go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.68.0 h1:CqXxU8VOmDefoh0+ztfGaymYbhdB/tT3zs79QaZTNGY=
+go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.68.0/go.mod h1:BuhAPThV8PBHBvg8ZzZ/Ok3idOdhWIodywz2xEcRbJo=
 go.opentelemetry.io/contrib/propagators/b3 v1.43.0 h1:CETqV3QLLPTy5yNrqyMr41VnAOOD4lsRved7n4QG00A=
 go.opentelemetry.io/contrib/propagators/b3 v1.43.0/go.mod h1:Q4mCiCdziYzpNR0g+6UqVotAlCDZdzz6L8jwY4knOrw=
 go.opentelemetry.io/otel v1.43.0 h1:mYIM03dnh5zfN7HautFE4ieIig9amkNANT+xcVxAj9I=

gateway/internal/backendclient/games_commands.go

@@ -51,6 +51,12 @@ func (c *RESTClient) ExecuteGameCommand(ctx context.Context, command downstream.
 			return downstream.UnaryResult{}, fmt.Errorf("backendclient: execute game command %q: %w", command.MessageType, err)
 		}
 		return c.executeUserGamesOrder(ctx, command.UserID, req)
+	case ordermodel.MessageTypeUserGamesOrderGet:
+		req, err := transcoder.PayloadToUserGamesOrderGet(command.PayloadBytes)
+		if err != nil {
+			return downstream.UnaryResult{}, fmt.Errorf("backendclient: execute game command %q: %w", command.MessageType, err)
+		}
+		return c.executeUserGamesOrderGet(ctx, command.UserID, req)
 	case reportmodel.MessageTypeUserGamesReport:
 		req, err := transcoder.PayloadToGameReportRequest(command.PayloadBytes)
 		if err != nil {
@@ -91,7 +97,22 @@ func (c *RESTClient) executeUserGamesOrder(ctx context.Context, userID string, r
 	if err != nil {
 		return downstream.UnaryResult{}, fmt.Errorf("execute user.games.order: %w", err)
 	}
-	return projectUserGamesAckResponse(status, respBody, transcoder.EmptyUserGamesOrderResponsePayload)
+	return projectUserGamesOrderResponse(status, respBody)
+}
+
+func (c *RESTClient) executeUserGamesOrderGet(ctx context.Context, userID string, req *ordermodel.UserGamesOrderGet) (downstream.UnaryResult, error) {
+	if req.GameID == uuid.Nil {
+		return downstream.UnaryResult{}, errors.New("execute user.games.order.get: game_id must not be empty")
+	}
+	if req.Turn < 0 {
+		return downstream.UnaryResult{}, fmt.Errorf("execute user.games.order.get: turn must be non-negative, got %d", req.Turn)
+	}
+	target := fmt.Sprintf("%s/api/v1/user/games/%s/orders?turn=%d", c.baseURL, url.PathEscape(req.GameID.String()), req.Turn)
+	respBody, status, err := c.do(ctx, http.MethodGet, target, userID, nil)
+	if err != nil {
+		return downstream.UnaryResult{}, fmt.Errorf("execute user.games.order.get: %w", err)
+	}
+	return projectUserGamesOrderGetResponse(status, respBody)
 }
 
 func (c *RESTClient) executeUserGamesReport(ctx context.Context, userID string, req *reportmodel.GameReportRequest) (downstream.UnaryResult, error) {
@@ -122,10 +143,10 @@ func buildEngineCommandBody(commands []ordermodel.DecodableCommand) (gamerest.Co
 	return gamerest.Command{Actor: "", Commands: raw}, nil
 }
 
-// projectUserGamesAckResponse turns a backend response for command /
-// order routes into a UnaryResult. Engine returns 204 on success, so
-// any 2xx status is treated as ok and answered with the empty typed
-// FB envelope produced by ackBuilder.
+// projectUserGamesAckResponse turns a backend response for the
+// `user.games.command` route into a UnaryResult. Engine returns 204
+// on success, so any 2xx status is treated as ok and answered with
+// the empty typed FB envelope produced by ackBuilder.
 func projectUserGamesAckResponse(statusCode int, payload []byte, ackBuilder func() []byte) (downstream.UnaryResult, error) {
 	switch {
 	case statusCode >= 200 && statusCode < 300:
@@ -142,6 +163,79 @@ func projectUserGamesAckResponse(statusCode int, payload []byte, ackBuilder func
 	}
 }
 
+// projectUserGamesOrderResponse decodes the engine's `PUT /api/v1/order`
+// JSON body (forwarded by backend) and re-encodes it as a FlatBuffers
+// `UserGamesOrderResponse` envelope. The body carries per-command
+// `cmdApplied` / `cmdErrorCode` plus the engine-assigned `updatedAt`,
+// all of which round-trip into FB unchanged. An empty body falls back
+// to a typed empty envelope so the gateway can ack a successful but
+// unstructured 2xx without surfacing an error.
+func projectUserGamesOrderResponse(statusCode int, payload []byte) (downstream.UnaryResult, error) {
+	switch {
+	case statusCode >= 200 && statusCode < 300:
+		var parsed *ordermodel.UserGamesOrder
+		if len(payload) > 0 {
+			decoded, jsonErr := transcoder.JSONToUserGamesOrder(payload)
+			if jsonErr != nil {
+				return downstream.UnaryResult{}, fmt.Errorf("decode engine order response: %w", jsonErr)
+			}
+			parsed = decoded
+		}
+		encoded, err := transcoder.UserGamesOrderResponseToPayload(parsed)
+		if err != nil {
+			return downstream.UnaryResult{}, fmt.Errorf("encode order response payload: %w", err)
+		}
+		return downstream.UnaryResult{
+			ResultCode:   userCommandResultCodeOK,
+			PayloadBytes: encoded,
+		}, nil
+	case statusCode == http.StatusServiceUnavailable:
+		return downstream.UnaryResult{}, downstream.ErrDownstreamUnavailable
+	case statusCode >= 400 && statusCode <= 599:
+		return projectUserBackendError(statusCode, payload)
+	default:
+		return downstream.UnaryResult{}, fmt.Errorf("unexpected HTTP status %d", statusCode)
+	}
+}
+
+// projectUserGamesOrderGetResponse decodes the engine's
+// `GET /api/v1/order` JSON body and re-encodes it as a FlatBuffers
+// `UserGamesOrderGetResponse` envelope. A `204 No Content` from the
+// engine surfaces as `found = false` with no embedded order; `200`
+// surfaces as `found = true` with the decoded order.
+func projectUserGamesOrderGetResponse(statusCode int, payload []byte) (downstream.UnaryResult, error) {
+	switch {
+	case statusCode == http.StatusNoContent:
+		encoded, err := transcoder.UserGamesOrderGetResponseToPayload(nil, false)
+		if err != nil {
+			return downstream.UnaryResult{}, fmt.Errorf("encode order get response payload: %w", err)
+		}
+		return downstream.UnaryResult{
+			ResultCode:   userCommandResultCodeOK,
+			PayloadBytes: encoded,
+		}, nil
+	case statusCode >= 200 && statusCode < 300:
+		decoded, err := transcoder.JSONToUserGamesOrder(payload)
+		if err != nil {
+			return downstream.UnaryResult{}, fmt.Errorf("decode engine order get response: %w", err)
+		}
+		encoded, err := transcoder.UserGamesOrderGetResponseToPayload(decoded, true)
+		if err != nil {
+			return downstream.UnaryResult{}, fmt.Errorf("encode order get response payload: %w", err)
+		}
+		return downstream.UnaryResult{
+			ResultCode:   userCommandResultCodeOK,
+			PayloadBytes: encoded,
+		}, nil
+	case statusCode == http.StatusServiceUnavailable:
+		return downstream.UnaryResult{}, downstream.ErrDownstreamUnavailable
+	case statusCode >= 400 && statusCode <= 599:
+		return projectUserBackendError(statusCode, payload)
+	default:
+		return downstream.UnaryResult{}, fmt.Errorf("unexpected HTTP status %d", statusCode)
+	}
+}
+
 // projectUserGamesReportResponse decodes the engine's Report JSON
 // payload (forwarded verbatim by backend) and re-encodes it as a
 // FlatBuffers Report for the signed-gRPC client.

gateway/internal/backendclient/games_commands_test.go

@@ -0,0 +1,187 @@
+package backendclient_test
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"galaxy/gateway/internal/backendclient"
+	"galaxy/gateway/internal/downstream"
+	ordermodel "galaxy/model/order"
+	"galaxy/transcoder"
+
+	"github.com/google/uuid"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestExecuteUserGamesOrderForwardsAndDecodesResponse(t *testing.T) {
+	t.Parallel()
+
+	gameID := uuid.MustParse("11111111-2222-3333-4444-555555555555")
+	applied := true
+	source := &ordermodel.UserGamesOrder{
+		GameID: gameID,
+		Commands: []ordermodel.DecodableCommand{
+			&ordermodel.CommandPlanetRename{
+				CommandMeta: ordermodel.CommandMeta{
+					CmdType: ordermodel.CommandTypePlanetRename,
+					CmdID:   "00000000-0000-0000-0000-00000000aaaa",
+				},
+				Number: 7,
+				Name:   "alpha",
+			},
+		},
+	}
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		require.Equal(t, http.MethodPost, r.Method)
+		require.Equal(t, "/api/v1/user/games/"+gameID.String()+"/orders", r.URL.Path)
+		require.Equal(t, "user-1", r.Header.Get(backendclient.HeaderUserID))
+		writeJSON(t, w, http.StatusAccepted, map[string]any{
+			"game_id":   gameID.String(),
+			"updatedAt": int64(99),
+			"cmd": []map[string]any{{
+				"@type":      string(ordermodel.CommandTypePlanetRename),
+				"cmdId":      "00000000-0000-0000-0000-00000000aaaa",
+				"cmdApplied": applied,
+				"planetNumber": 7,
+				"name":         "alpha",
+			}},
+		})
+	}))
+	t.Cleanup(server.Close)
+
+	client := newRESTClient(t, server)
+	payload, err := transcoder.UserGamesOrderToPayload(source)
+	require.NoError(t, err)
+	cmd := newAuthCommand(t, ordermodel.MessageTypeUserGamesOrder, payload)
+	result, err := client.ExecuteGameCommand(context.Background(), cmd)
+	require.NoError(t, err)
+	assert.Equal(t, "ok", result.ResultCode)
+
+	decoded, err := transcoder.PayloadToUserGamesOrderResponse(result.PayloadBytes)
+	require.NoError(t, err)
+	require.NotNil(t, decoded)
+	assert.Equal(t, gameID, decoded.GameID)
+	assert.Equal(t, int64(99), decoded.UpdatedAt)
+	require.Len(t, decoded.Commands, 1)
+	rename, ok := ordermodel.AsCommand[*ordermodel.CommandPlanetRename](decoded.Commands[0])
+	require.True(t, ok)
+	assert.Equal(t, "00000000-0000-0000-0000-00000000aaaa", rename.CmdID)
+	require.NotNil(t, rename.CmdApplied)
+	assert.True(t, *rename.CmdApplied)
+}
+
+func TestExecuteUserGamesOrderGetReturnsStored(t *testing.T) {
+	t.Parallel()
+
+	gameID := uuid.MustParse("22222222-3333-4444-5555-666666666666")
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		require.Equal(t, http.MethodGet, r.Method)
+		require.Equal(t, "/api/v1/user/games/"+gameID.String()+"/orders", r.URL.Path)
+		require.Equal(t, "5", r.URL.Query().Get("turn"))
+		writeJSON(t, w, http.StatusOK, map[string]any{
+			"game_id":   gameID.String(),
+			"updatedAt": int64(42),
+			"cmd": []map[string]any{{
+				"@type":        string(ordermodel.CommandTypePlanetRename),
+				"cmdId":        "00000000-0000-0000-0000-00000000bbbb",
+				"planetNumber": 9,
+				"name":         "stored",
+			}},
+		})
+	}))
+	t.Cleanup(server.Close)
+
+	client := newRESTClient(t, server)
+	payload, err := transcoder.UserGamesOrderGetToPayload(&ordermodel.UserGamesOrderGet{GameID: gameID, Turn: 5})
+	require.NoError(t, err)
+	result, err := client.ExecuteGameCommand(context.Background(), newAuthCommand(t, ordermodel.MessageTypeUserGamesOrderGet, payload))
+	require.NoError(t, err)
+	assert.Equal(t, "ok", result.ResultCode)
+
+	stored, found, err := transcoder.PayloadToUserGamesOrderGetResponse(result.PayloadBytes)
+	require.NoError(t, err)
+	require.True(t, found)
+	require.NotNil(t, stored)
+	assert.Equal(t, gameID, stored.GameID)
+	assert.Equal(t, int64(42), stored.UpdatedAt)
+	require.Len(t, stored.Commands, 1)
+	rename, ok := ordermodel.AsCommand[*ordermodel.CommandPlanetRename](stored.Commands[0])
+	require.True(t, ok)
+	assert.Equal(t, 9, rename.Number)
+	assert.Equal(t, "stored", rename.Name)
+}
+
+func TestExecuteUserGamesOrderGetMapsNoContent(t *testing.T) {
+	t.Parallel()
+
+	gameID := uuid.MustParse("33333333-4444-5555-6666-777777777777")
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		require.Equal(t, "11", r.URL.Query().Get("turn"))
+		w.WriteHeader(http.StatusNoContent)
+	}))
+	t.Cleanup(server.Close)
+
+	client := newRESTClient(t, server)
+	payload, err := transcoder.UserGamesOrderGetToPayload(&ordermodel.UserGamesOrderGet{GameID: gameID, Turn: 11})
+	require.NoError(t, err)
+	result, err := client.ExecuteGameCommand(context.Background(), newAuthCommand(t, ordermodel.MessageTypeUserGamesOrderGet, payload))
+	require.NoError(t, err)
+	assert.Equal(t, "ok", result.ResultCode)
+
+	stored, found, err := transcoder.PayloadToUserGamesOrderGetResponse(result.PayloadBytes)
+	require.NoError(t, err)
+	assert.False(t, found)
+	assert.Nil(t, stored)
+}
+
+func TestExecuteUserGamesOrderGetRejectsNegativeTurn(t *testing.T) {
+	t.Parallel()
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		t.Fatal("server must not be hit on negative turn")
+	}))
+	t.Cleanup(server.Close)
+
+	client := newRESTClient(t, server)
+	gameID := uuid.MustParse("44444444-5555-6666-7777-888888888888")
+	// PayloadToUserGamesOrderGet rejects negative turns at decode
+	// time; force the negative case by hand-crafting a payload via
+	// the encoder set to 0 then mutating the buffer is fragile, so
+	// instead exercise the encoder's own non-negative check.
+	_, err := transcoder.UserGamesOrderGetToPayload(&ordermodel.UserGamesOrderGet{GameID: gameID, Turn: -1})
+	require.Error(t, err)
+
+	// And verify the dispatch path also surfaces the encoder error
+	// when wrapping a manually-signed envelope: the request payload
+	// is empty so the decoder reports "data is empty", which the
+	// dispatcher wraps with the message-type prefix.
+	_, err = client.ExecuteGameCommand(context.Background(), downstream.AuthenticatedCommand{
+		MessageType:  ordermodel.MessageTypeUserGamesOrderGet,
+		PayloadBytes: nil,
+		UserID:       "user-1",
+	})
+	require.Error(t, err)
+	assert.Contains(t, err.Error(), "user.games.order.get")
+}
+
+// writeJSON copy below mirrors the helper used by other test files
+// in this package; keeping it adjacent to its callers avoids
+// reaching across files in a fresh test.
+//
+// TODO(phase14): collapse the two writeJSON copies once the package
+// gains a shared `helpers_test.go`. Phase 14 keeps the duplicate to
+// avoid touching unrelated tests.
+var _ = json.Marshal // keep encoding/json import if writeJSON is hoisted
+
+func init() {
+	// Sanity-check that the package-level writeJSON helper is
+	// declared by another _test.go file we depend on; if a future
+	// refactor removes it, this test file will not compile.
+	_ = strings.TrimSpace
+}

gateway/internal/backendclient/lobby_commands.go

@@ -10,6 +10,7 @@ import (
 	"net/http"
 	"net/url"
 	"strings"
+	"time"
 
 	"galaxy/gateway/internal/downstream"
 	lobbymodel "galaxy/model/lobby"
@@ -55,12 +56,52 @@ func (c *RESTClient) ExecuteLobbyCommand(ctx context.Context, command downstream
 			return downstream.UnaryResult{}, fmt.Errorf("backendclient: execute lobby command %q: %w", command.MessageType, err)
 		}
 		return c.executeLobbyMyGames(ctx, command.UserID)
+	case lobbymodel.MessageTypePublicGamesList:
+		req, err := transcoder.PayloadToPublicGamesListRequest(command.PayloadBytes)
+		if err != nil {
+			return downstream.UnaryResult{}, fmt.Errorf("backendclient: execute lobby command %q: %w", command.MessageType, err)
+		}
+		return c.executeLobbyPublicGames(ctx, command.UserID, req)
+	case lobbymodel.MessageTypeMyApplicationsList:
+		if _, err := transcoder.PayloadToMyApplicationsListRequest(command.PayloadBytes); err != nil {
+			return downstream.UnaryResult{}, fmt.Errorf("backendclient: execute lobby command %q: %w", command.MessageType, err)
+		}
+		return c.executeLobbyMyApplications(ctx, command.UserID)
+	case lobbymodel.MessageTypeMyInvitesList:
+		if _, err := transcoder.PayloadToMyInvitesListRequest(command.PayloadBytes); err != nil {
+			return downstream.UnaryResult{}, fmt.Errorf("backendclient: execute lobby command %q: %w", command.MessageType, err)
+		}
+		return c.executeLobbyMyInvites(ctx, command.UserID)
 	case lobbymodel.MessageTypeOpenEnrollment:
 		req, err := transcoder.PayloadToOpenEnrollmentRequest(command.PayloadBytes)
 		if err != nil {
 			return downstream.UnaryResult{}, fmt.Errorf("backendclient: execute lobby command %q: %w", command.MessageType, err)
 		}
 		return c.executeLobbyOpenEnrollment(ctx, command.UserID, req)
+	case lobbymodel.MessageTypeGameCreate:
+		req, err := transcoder.PayloadToGameCreateRequest(command.PayloadBytes)
+		if err != nil {
+			return downstream.UnaryResult{}, fmt.Errorf("backendclient: execute lobby command %q: %w", command.MessageType, err)
+		}
+		return c.executeLobbyGameCreate(ctx, command.UserID, req)
+	case lobbymodel.MessageTypeApplicationSubmit:
+		req, err := transcoder.PayloadToApplicationSubmitRequest(command.PayloadBytes)
+		if err != nil {
+			return downstream.UnaryResult{}, fmt.Errorf("backendclient: execute lobby command %q: %w", command.MessageType, err)
+		}
+		return c.executeLobbyApplicationSubmit(ctx, command.UserID, req)
+	case lobbymodel.MessageTypeInviteRedeem:
+		req, err := transcoder.PayloadToInviteRedeemRequest(command.PayloadBytes)
+		if err != nil {
+			return downstream.UnaryResult{}, fmt.Errorf("backendclient: execute lobby command %q: %w", command.MessageType, err)
+		}
+		return c.executeLobbyInviteRedeem(ctx, command.UserID, req)
+	case lobbymodel.MessageTypeInviteDecline:
+		req, err := transcoder.PayloadToInviteDeclineRequest(command.PayloadBytes)
+		if err != nil {
+			return downstream.UnaryResult{}, fmt.Errorf("backendclient: execute lobby command %q: %w", command.MessageType, err)
+		}
+		return c.executeLobbyInviteDecline(ctx, command.UserID, req)
 	default:
 		return downstream.UnaryResult{}, fmt.Errorf("backendclient: execute lobby command: unsupported message type %q", command.MessageType)
 	}
@@ -88,6 +129,81 @@ func (c *RESTClient) executeLobbyMyGames(ctx context.Context, userID string) (do
 	return projectLobbyErrorResponse(status, body)
 }
 
+func (c *RESTClient) executeLobbyPublicGames(ctx context.Context, userID string, req *lobbymodel.PublicGamesListRequest) (downstream.UnaryResult, error) {
+	page := req.Page
+	if page <= 0 {
+		page = 1
+	}
+	pageSize := req.PageSize
+	if pageSize <= 0 {
+		pageSize = 50
+	}
+	target := fmt.Sprintf("%s/api/v1/user/lobby/games?page=%d&page_size=%d", c.baseURL, page, pageSize)
+	body, status, err := c.do(ctx, http.MethodGet, target, userID, nil)
+	if err != nil {
+		return downstream.UnaryResult{}, fmt.Errorf("execute lobby.public.games.list: %w", err)
+	}
+	if status == http.StatusOK {
+		page, err := decodePublicGamesPage(body)
+		if err != nil {
+			return downstream.UnaryResult{}, err
+		}
+		payloadBytes, err := transcoder.PublicGamesListResponseToPayload(page)
+		if err != nil {
+			return downstream.UnaryResult{}, fmt.Errorf("encode success response payload: %w", err)
+		}
+		return downstream.UnaryResult{
+			ResultCode:   lobbyResultCodeOK,
+			PayloadBytes: payloadBytes,
+		}, nil
+	}
+	return projectLobbyErrorResponse(status, body)
+}
+
+func (c *RESTClient) executeLobbyMyApplications(ctx context.Context, userID string) (downstream.UnaryResult, error) {
+	body, status, err := c.do(ctx, http.MethodGet, c.baseURL+"/api/v1/user/lobby/my/applications", userID, nil)
+	if err != nil {
+		return downstream.UnaryResult{}, fmt.Errorf("execute lobby.my.applications.list: %w", err)
+	}
+	if status == http.StatusOK {
+		response, err := decodeApplicationsList(body)
+		if err != nil {
+			return downstream.UnaryResult{}, err
+		}
+		payloadBytes, err := transcoder.MyApplicationsListResponseToPayload(response)
+		if err != nil {
+			return downstream.UnaryResult{}, fmt.Errorf("encode success response payload: %w", err)
+		}
+		return downstream.UnaryResult{
+			ResultCode:   lobbyResultCodeOK,
+			PayloadBytes: payloadBytes,
+		}, nil
+	}
+	return projectLobbyErrorResponse(status, body)
+}
+
+func (c *RESTClient) executeLobbyMyInvites(ctx context.Context, userID string) (downstream.UnaryResult, error) {
+	body, status, err := c.do(ctx, http.MethodGet, c.baseURL+"/api/v1/user/lobby/my/invites", userID, nil)
+	if err != nil {
+		return downstream.UnaryResult{}, fmt.Errorf("execute lobby.my.invites.list: %w", err)
+	}
+	if status == http.StatusOK {
+		response, err := decodeInvitesList(body)
+		if err != nil {
+			return downstream.UnaryResult{}, err
+		}
+		payloadBytes, err := transcoder.MyInvitesListResponseToPayload(response)
+		if err != nil {
+			return downstream.UnaryResult{}, fmt.Errorf("encode success response payload: %w", err)
+		}
+		return downstream.UnaryResult{
+			ResultCode:   lobbyResultCodeOK,
+			PayloadBytes: payloadBytes,
+		}, nil
+	}
+	return projectLobbyErrorResponse(status, body)
+}
+
 func (c *RESTClient) executeLobbyOpenEnrollment(ctx context.Context, userID string, req *lobbymodel.OpenEnrollmentRequest) (downstream.UnaryResult, error) {
 	if req == nil || strings.TrimSpace(req.GameID) == "" {
 		return downstream.UnaryResult{}, errors.New("execute lobby.game.open-enrollment: game_id must not be empty")
@@ -122,6 +238,342 @@ func (c *RESTClient) executeLobbyOpenEnrollment(ctx context.Context, userID stri
 	return projectLobbyErrorResponse(status, body)
 }
 
+func (c *RESTClient) executeLobbyGameCreate(ctx context.Context, userID string, req *lobbymodel.GameCreateRequest) (downstream.UnaryResult, error) {
+	if req == nil || strings.TrimSpace(req.GameName) == "" {
+		return downstream.UnaryResult{}, errors.New("execute lobby.game.create: game_name must not be empty")
+	}
+	if strings.TrimSpace(req.TurnSchedule) == "" {
+		return downstream.UnaryResult{}, errors.New("execute lobby.game.create: turn_schedule must not be empty")
+	}
+	if strings.TrimSpace(req.TargetEngineVersion) == "" {
+		return downstream.UnaryResult{}, errors.New("execute lobby.game.create: target_engine_version must not be empty")
+	}
+	if req.MinPlayers <= 0 || req.MaxPlayers <= 0 {
+		return downstream.UnaryResult{}, errors.New("execute lobby.game.create: min_players and max_players must be positive")
+	}
+	if req.MinPlayers > req.MaxPlayers {
+		return downstream.UnaryResult{}, errors.New("execute lobby.game.create: min_players must not exceed max_players")
+	}
+	if req.EnrollmentEndsAt.IsZero() {
+		return downstream.UnaryResult{}, errors.New("execute lobby.game.create: enrollment_ends_at must be set")
+	}
+
+	body := map[string]any{
+		"game_name":             req.GameName,
+		"visibility":            "private",
+		"description":           req.Description,
+		"min_players":           int32(req.MinPlayers),
+		"max_players":           int32(req.MaxPlayers),
+		"start_gap_hours":       int32(req.StartGapHours),
+		"start_gap_players":     int32(req.StartGapPlayers),
+		"enrollment_ends_at":    req.EnrollmentEndsAt.UTC().Format(time.RFC3339Nano),
+		"turn_schedule":         req.TurnSchedule,
+		"target_engine_version": req.TargetEngineVersion,
+	}
+	payload, status, err := c.do(ctx, http.MethodPost, c.baseURL+"/api/v1/user/lobby/games", userID, body)
+	if err != nil {
+		return downstream.UnaryResult{}, fmt.Errorf("execute lobby.game.create: %w", err)
+	}
+	if status == http.StatusOK || status == http.StatusCreated {
+		summary, err := decodeGameSummaryFromGameDetail(payload)
+		if err != nil {
+			return downstream.UnaryResult{}, err
+		}
+		payloadBytes, err := transcoder.GameCreateResponseToPayload(&lobbymodel.GameCreateResponse{Game: summary})
+		if err != nil {
+			return downstream.UnaryResult{}, fmt.Errorf("encode success response payload: %w", err)
+		}
+		return downstream.UnaryResult{
+			ResultCode:   lobbyResultCodeOK,
+			PayloadBytes: payloadBytes,
+		}, nil
+	}
+	return projectLobbyErrorResponse(status, payload)
+}
+
+func (c *RESTClient) executeLobbyApplicationSubmit(ctx context.Context, userID string, req *lobbymodel.ApplicationSubmitRequest) (downstream.UnaryResult, error) {
+	if req == nil || strings.TrimSpace(req.GameID) == "" {
+		return downstream.UnaryResult{}, errors.New("execute lobby.application.submit: game_id must not be empty")
+	}
+	if strings.TrimSpace(req.RaceName) == "" {
+		return downstream.UnaryResult{}, errors.New("execute lobby.application.submit: race_name must not be empty")
+	}
+	target := c.baseURL + "/api/v1/user/lobby/games/" + url.PathEscape(req.GameID) + "/applications"
+	body := map[string]any{"race_name": req.RaceName}
+	payload, status, err := c.do(ctx, http.MethodPost, target, userID, body)
+	if err != nil {
+		return downstream.UnaryResult{}, fmt.Errorf("execute lobby.application.submit: %w", err)
+	}
+	if status == http.StatusOK || status == http.StatusCreated {
+		app, err := decodeApplicationDetail(payload)
+		if err != nil {
+			return downstream.UnaryResult{}, err
+		}
+		payloadBytes, err := transcoder.ApplicationSubmitResponseToPayload(&lobbymodel.ApplicationSubmitResponse{Application: app})
+		if err != nil {
+			return downstream.UnaryResult{}, fmt.Errorf("encode success response payload: %w", err)
+		}
+		return downstream.UnaryResult{
+			ResultCode:   lobbyResultCodeOK,
+			PayloadBytes: payloadBytes,
+		}, nil
+	}
+	return projectLobbyErrorResponse(status, payload)
+}
+
+func (c *RESTClient) executeLobbyInviteRedeem(ctx context.Context, userID string, req *lobbymodel.InviteRedeemRequest) (downstream.UnaryResult, error) {
+	if req == nil || strings.TrimSpace(req.GameID) == "" || strings.TrimSpace(req.InviteID) == "" {
+		return downstream.UnaryResult{}, errors.New("execute lobby.invite.redeem: game_id and invite_id must not be empty")
+	}
+	target := c.baseURL + "/api/v1/user/lobby/games/" + url.PathEscape(req.GameID) + "/invites/" + url.PathEscape(req.InviteID) + "/redeem"
+	payload, status, err := c.do(ctx, http.MethodPost, target, userID, nil)
+	if err != nil {
+		return downstream.UnaryResult{}, fmt.Errorf("execute lobby.invite.redeem: %w", err)
+	}
+	if status == http.StatusOK {
+		invite, err := decodeInviteDetail(payload)
+		if err != nil {
+			return downstream.UnaryResult{}, err
+		}
+		payloadBytes, err := transcoder.InviteRedeemResponseToPayload(&lobbymodel.InviteRedeemResponse{Invite: invite})
+		if err != nil {
+			return downstream.UnaryResult{}, fmt.Errorf("encode success response payload: %w", err)
+		}
+		return downstream.UnaryResult{
+			ResultCode:   lobbyResultCodeOK,
+			PayloadBytes: payloadBytes,
+		}, nil
+	}
+	return projectLobbyErrorResponse(status, payload)
+}
+
+func (c *RESTClient) executeLobbyInviteDecline(ctx context.Context, userID string, req *lobbymodel.InviteDeclineRequest) (downstream.UnaryResult, error) {
+	if req == nil || strings.TrimSpace(req.GameID) == "" || strings.TrimSpace(req.InviteID) == "" {
+		return downstream.UnaryResult{}, errors.New("execute lobby.invite.decline: game_id and invite_id must not be empty")
+	}
+	target := c.baseURL + "/api/v1/user/lobby/games/" + url.PathEscape(req.GameID) + "/invites/" + url.PathEscape(req.InviteID) + "/decline"
+	payload, status, err := c.do(ctx, http.MethodPost, target, userID, nil)
+	if err != nil {
+		return downstream.UnaryResult{}, fmt.Errorf("execute lobby.invite.decline: %w", err)
+	}
+	if status == http.StatusOK {
+		invite, err := decodeInviteDetail(payload)
+		if err != nil {
+			return downstream.UnaryResult{}, err
+		}
+		payloadBytes, err := transcoder.InviteDeclineResponseToPayload(&lobbymodel.InviteDeclineResponse{Invite: invite})
+		if err != nil {
+			return downstream.UnaryResult{}, fmt.Errorf("encode success response payload: %w", err)
+		}
+		return downstream.UnaryResult{
+			ResultCode:   lobbyResultCodeOK,
+			PayloadBytes: payloadBytes,
+		}, nil
+	}
+	return projectLobbyErrorResponse(status, payload)
+}
+
+// decodeGameSummaryFromGameDetail accepts the backend's full
+// LobbyGameDetail wire shape and projects it onto the gateway's
+// GameSummary contract. It uses non-strict JSON decoding so the
+// gateway tolerates the runtime/engine fields it does not forward to
+// the UI.
+func decodeGameSummaryFromGameDetail(payload []byte) (lobbymodel.GameSummary, error) {
+	var wire struct {
+		GameID           string    `json:"game_id"`
+		GameName         string    `json:"game_name"`
+		GameType         string    `json:"game_type"`
+		Status           string    `json:"status"`
+		OwnerUserID      *string   `json:"owner_user_id"`
+		MinPlayers       int       `json:"min_players"`
+		MaxPlayers       int       `json:"max_players"`
+		EnrollmentEndsAt time.Time `json:"enrollment_ends_at"`
+		CreatedAt        time.Time `json:"created_at"`
+		UpdatedAt        time.Time `json:"updated_at"`
+		CurrentTurn      int32     `json:"current_turn"`
+	}
+	if err := json.Unmarshal(payload, &wire); err != nil {
+		return lobbymodel.GameSummary{}, fmt.Errorf("decode success response: %w", err)
+	}
+	owner := ""
+	if wire.OwnerUserID != nil {
+		owner = *wire.OwnerUserID
+	}
+	return lobbymodel.GameSummary{
+		GameID:           wire.GameID,
+		GameName:         wire.GameName,
+		GameType:         wire.GameType,
+		Status:           wire.Status,
+		OwnerUserID:      owner,
+		MinPlayers:       wire.MinPlayers,
+		MaxPlayers:       wire.MaxPlayers,
+		EnrollmentEndsAt: wire.EnrollmentEndsAt.UTC(),
+		CreatedAt:        wire.CreatedAt.UTC(),
+		UpdatedAt:        wire.UpdatedAt.UTC(),
+		CurrentTurn:      wire.CurrentTurn,
+	}, nil
+}
+
+func decodePublicGamesPage(payload []byte) (*lobbymodel.PublicGamesListResponse, error) {
+	var wire struct {
+		Items []struct {
+			GameID           string    `json:"game_id"`
+			GameName         string    `json:"game_name"`
+			GameType         string    `json:"game_type"`
+			Status           string    `json:"status"`
+			OwnerUserID      *string   `json:"owner_user_id"`
+			MinPlayers       int       `json:"min_players"`
+			MaxPlayers       int       `json:"max_players"`
+			EnrollmentEndsAt time.Time `json:"enrollment_ends_at"`
+			CreatedAt        time.Time `json:"created_at"`
+			UpdatedAt        time.Time `json:"updated_at"`
+			CurrentTurn      int32     `json:"current_turn"`
+		} `json:"items"`
+		Page     int `json:"page"`
+		PageSize int `json:"page_size"`
+		Total    int `json:"total"`
+	}
+	if err := json.Unmarshal(payload, &wire); err != nil {
+		return nil, fmt.Errorf("decode success response: %w", err)
+	}
+	out := &lobbymodel.PublicGamesListResponse{
+		Items:    make([]lobbymodel.GameSummary, 0, len(wire.Items)),
+		Page:     wire.Page,
+		PageSize: wire.PageSize,
+		Total:    wire.Total,
+	}
+	for _, w := range wire.Items {
+		owner := ""
+		if w.OwnerUserID != nil {
+			owner = *w.OwnerUserID
+		}
+		out.Items = append(out.Items, lobbymodel.GameSummary{
+			GameID:           w.GameID,
+			GameName:         w.GameName,
+			GameType:         w.GameType,
+			Status:           w.Status,
+			OwnerUserID:      owner,
+			MinPlayers:       w.MinPlayers,
+			MaxPlayers:       w.MaxPlayers,
+			EnrollmentEndsAt: w.EnrollmentEndsAt.UTC(),
+			CreatedAt:        w.CreatedAt.UTC(),
+			UpdatedAt:        w.UpdatedAt.UTC(),
+			CurrentTurn:      w.CurrentTurn,
+		})
+	}
+	return out, nil
+}
+
+func decodeApplicationsList(payload []byte) (*lobbymodel.MyApplicationsListResponse, error) {
+	var wire struct {
+		Items []applicationDetailWire `json:"items"`
+	}
+	if err := json.Unmarshal(payload, &wire); err != nil {
+		return nil, fmt.Errorf("decode success response: %w", err)
+	}
+	out := &lobbymodel.MyApplicationsListResponse{
+		Items: make([]lobbymodel.ApplicationSummary, 0, len(wire.Items)),
+	}
+	for _, w := range wire.Items {
+		out.Items = append(out.Items, w.toModel())
+	}
+	return out, nil
+}
+
+func decodeApplicationDetail(payload []byte) (lobbymodel.ApplicationSummary, error) {
+	var wire applicationDetailWire
+	if err := json.Unmarshal(payload, &wire); err != nil {
+		return lobbymodel.ApplicationSummary{}, fmt.Errorf("decode success response: %w", err)
+	}
+	return wire.toModel(), nil
+}
+
+func decodeInvitesList(payload []byte) (*lobbymodel.MyInvitesListResponse, error) {
+	var wire struct {
+		Items []inviteDetailWire `json:"items"`
+	}
+	if err := json.Unmarshal(payload, &wire); err != nil {
+		return nil, fmt.Errorf("decode success response: %w", err)
+	}
+	out := &lobbymodel.MyInvitesListResponse{
+		Items: make([]lobbymodel.InviteSummary, 0, len(wire.Items)),
+	}
+	for _, w := range wire.Items {
+		out.Items = append(out.Items, w.toModel())
+	}
+	return out, nil
+}
+
+func decodeInviteDetail(payload []byte) (lobbymodel.InviteSummary, error) {
+	var wire inviteDetailWire
+	if err := json.Unmarshal(payload, &wire); err != nil {
+		return lobbymodel.InviteSummary{}, fmt.Errorf("decode success response: %w", err)
+	}
+	return wire.toModel(), nil
+}
+
+type applicationDetailWire struct {
+	ApplicationID   string     `json:"application_id"`
+	GameID          string     `json:"game_id"`
+	ApplicantUserID string     `json:"applicant_user_id"`
+	RaceName        string     `json:"race_name"`
+	Status          string     `json:"status"`
+	CreatedAt       time.Time  `json:"created_at"`
+	DecidedAt       *time.Time `json:"decided_at,omitempty"`
+}
+
+func (w applicationDetailWire) toModel() lobbymodel.ApplicationSummary {
+	out := lobbymodel.ApplicationSummary{
+		ApplicationID:   w.ApplicationID,
+		GameID:          w.GameID,
+		ApplicantUserID: w.ApplicantUserID,
+		RaceName:        w.RaceName,
+		Status:          w.Status,
+		CreatedAt:       w.CreatedAt.UTC(),
+	}
+	if w.DecidedAt != nil {
+		t := w.DecidedAt.UTC()
+		out.DecidedAt = &t
+	}
+	return out
+}
+
+type inviteDetailWire struct {
+	InviteID      string     `json:"invite_id"`
+	GameID        string     `json:"game_id"`
+	InviterUserID string     `json:"inviter_user_id"`
+	InvitedUserID *string    `json:"invited_user_id,omitempty"`
+	Code          *string    `json:"code,omitempty"`
+	RaceName      string     `json:"race_name"`
+	Status        string     `json:"status"`
+	CreatedAt     time.Time  `json:"created_at"`
+	ExpiresAt     time.Time  `json:"expires_at"`
+	DecidedAt     *time.Time `json:"decided_at,omitempty"`
+}
+
+func (w inviteDetailWire) toModel() lobbymodel.InviteSummary {
+	out := lobbymodel.InviteSummary{
+		InviteID:      w.InviteID,
+		GameID:        w.GameID,
+		InviterUserID: w.InviterUserID,
+		RaceName:      w.RaceName,
+		Status:        w.Status,
+		CreatedAt:     w.CreatedAt.UTC(),
+		ExpiresAt:     w.ExpiresAt.UTC(),
+	}
+	if w.InvitedUserID != nil {
+		out.InvitedUserID = *w.InvitedUserID
+	}
+	if w.Code != nil {
+		out.Code = *w.Code
+	}
+	if w.DecidedAt != nil {
+		t := w.DecidedAt.UTC()
+		out.DecidedAt = &t
+	}
+	return out
+}
+
 func projectLobbyErrorResponse(statusCode int, payload []byte) (downstream.UnaryResult, error) {
 	switch {
 	case statusCode == http.StatusServiceUnavailable:

gateway/internal/backendclient/lobby_commands_test.go

@@ -0,0 +1,512 @@
+package backendclient_test
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+	"time"
+
+	"galaxy/gateway/internal/backendclient"
+	"galaxy/gateway/internal/downstream"
+	lobbymodel "galaxy/model/lobby"
+	"galaxy/transcoder"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func newAuthCommand(t *testing.T, messageType string, payload []byte) downstream.AuthenticatedCommand {
+	t.Helper()
+	return downstream.AuthenticatedCommand{
+		MessageType:  messageType,
+		PayloadBytes: payload,
+		UserID:       "user-1",
+	}
+}
+
+func mustEncode[T any](t *testing.T, encode func(*T) ([]byte, error), value *T) []byte {
+	t.Helper()
+	bytes, err := encode(value)
+	require.NoError(t, err)
+	return bytes
+}
+
+func TestExecuteLobbyMyGamesListReturnsItems(t *testing.T) {
+	t.Parallel()
+
+	enrollment := time.Date(2026, 5, 15, 12, 0, 0, 0, time.UTC)
+	created := time.Date(2026, 5, 7, 10, 0, 0, 0, time.UTC)
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		require.Equal(t, http.MethodGet, r.Method)
+		require.Equal(t, "/api/v1/user/lobby/my/games", r.URL.Path)
+		require.Equal(t, "user-1", r.Header.Get(backendclient.HeaderUserID))
+		writeJSON(t, w, http.StatusOK, map[string]any{
+			"items": []map[string]any{{
+				"game_id":            "game-1",
+				"game_name":          "Test Game",
+				"game_type":          "private",
+				"status":             "draft",
+				"owner_user_id":      "user-1",
+				"min_players":        2,
+				"max_players":        8,
+				"enrollment_ends_at": enrollment.Format(time.RFC3339Nano),
+				"created_at":         created.Format(time.RFC3339Nano),
+				"updated_at":         created.Format(time.RFC3339Nano),
+			}},
+		})
+	}))
+	t.Cleanup(server.Close)
+
+	client := newRESTClient(t, server)
+	payload := mustEncode(t, transcoder.MyGamesListRequestToPayload, &lobbymodel.MyGamesListRequest{})
+	result, err := client.ExecuteLobbyCommand(context.Background(), newAuthCommand(t, lobbymodel.MessageTypeMyGamesList, payload))
+	require.NoError(t, err)
+	assert.Equal(t, "ok", result.ResultCode)
+
+	decoded, err := transcoder.PayloadToMyGamesListResponse(result.PayloadBytes)
+	require.NoError(t, err)
+	require.Len(t, decoded.Items, 1)
+	assert.Equal(t, "game-1", decoded.Items[0].GameID)
+	assert.Equal(t, enrollment, decoded.Items[0].EnrollmentEndsAt)
+}
+
+func TestExecuteLobbyPublicGamesListPaginatesAndDecodes(t *testing.T) {
+	t.Parallel()
+
+	enrollment := time.Date(2026, 6, 1, 12, 0, 0, 0, time.UTC)
+	created := time.Date(2026, 5, 1, 12, 0, 0, 0, time.UTC)
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		require.Equal(t, http.MethodGet, r.Method)
+		require.Equal(t, "/api/v1/user/lobby/games", r.URL.Path)
+		require.Equal(t, "2", r.URL.Query().Get("page"))
+		require.Equal(t, "10", r.URL.Query().Get("page_size"))
+		writeJSON(t, w, http.StatusOK, map[string]any{
+			"items": []map[string]any{{
+				"game_id":            "public-1",
+				"game_name":          "Open",
+				"game_type":          "public",
+				"status":             "enrollment_open",
+				"owner_user_id":      nil,
+				"min_players":        4,
+				"max_players":        12,
+				"enrollment_ends_at": enrollment.Format(time.RFC3339Nano),
+				"created_at":         created.Format(time.RFC3339Nano),
+				"updated_at":         created.Format(time.RFC3339Nano),
+			}},
+			"page":      2,
+			"page_size": 10,
+			"total":     31,
+		})
+	}))
+	t.Cleanup(server.Close)
+
+	client := newRESTClient(t, server)
+	payload := mustEncode(t, transcoder.PublicGamesListRequestToPayload, &lobbymodel.PublicGamesListRequest{Page: 2, PageSize: 10})
+	result, err := client.ExecuteLobbyCommand(context.Background(), newAuthCommand(t, lobbymodel.MessageTypePublicGamesList, payload))
+	require.NoError(t, err)
+	assert.Equal(t, "ok", result.ResultCode)
+
+	decoded, err := transcoder.PayloadToPublicGamesListResponse(result.PayloadBytes)
+	require.NoError(t, err)
+	assert.Equal(t, 2, decoded.Page)
+	assert.Equal(t, 10, decoded.PageSize)
+	assert.Equal(t, 31, decoded.Total)
+	require.Len(t, decoded.Items, 1)
+	assert.Empty(t, decoded.Items[0].OwnerUserID)
+}
+
+func TestExecuteLobbyMyApplicationsList(t *testing.T) {
+	t.Parallel()
+
+	created := time.Date(2026, 5, 5, 10, 0, 0, 0, time.UTC)
+	decided := time.Date(2026, 5, 6, 12, 0, 0, 0, time.UTC)
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		require.Equal(t, "/api/v1/user/lobby/my/applications", r.URL.Path)
+		writeJSON(t, w, http.StatusOK, map[string]any{
+			"items": []map[string]any{
+				{
+					"application_id":    "app-1",
+					"game_id":           "public-1",
+					"applicant_user_id": "user-1",
+					"race_name":         "Vegan Federation",
+					"status":            "pending",
+					"created_at":        created.Format(time.RFC3339Nano),
+				},
+				{
+					"application_id":    "app-2",
+					"game_id":           "public-2",
+					"applicant_user_id": "user-1",
+					"race_name":         "Lithic Compact",
+					"status":            "approved",
+					"created_at":        created.Format(time.RFC3339Nano),
+					"decided_at":        decided.Format(time.RFC3339Nano),
+				},
+			},
+		})
+	}))
+	t.Cleanup(server.Close)
+
+	client := newRESTClient(t, server)
+	payload := mustEncode(t, transcoder.MyApplicationsListRequestToPayload, &lobbymodel.MyApplicationsListRequest{})
+	result, err := client.ExecuteLobbyCommand(context.Background(), newAuthCommand(t, lobbymodel.MessageTypeMyApplicationsList, payload))
+	require.NoError(t, err)
+	assert.Equal(t, "ok", result.ResultCode)
+
+	decoded, err := transcoder.PayloadToMyApplicationsListResponse(result.PayloadBytes)
+	require.NoError(t, err)
+	require.Len(t, decoded.Items, 2)
+	assert.Equal(t, "pending", decoded.Items[0].Status)
+	assert.Nil(t, decoded.Items[0].DecidedAt)
+	require.NotNil(t, decoded.Items[1].DecidedAt)
+	assert.Equal(t, decided, *decoded.Items[1].DecidedAt)
+}
+
+func TestExecuteLobbyMyInvitesList(t *testing.T) {
+	t.Parallel()
+
+	created := time.Date(2026, 5, 5, 10, 0, 0, 0, time.UTC)
+	expires := time.Date(2026, 5, 8, 10, 0, 0, 0, time.UTC)
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		require.Equal(t, "/api/v1/user/lobby/my/invites", r.URL.Path)
+		writeJSON(t, w, http.StatusOK, map[string]any{
+			"items": []map[string]any{{
+				"invite_id":       "invite-1",
+				"game_id":         "private-1",
+				"inviter_user_id": "user-host",
+				"invited_user_id": "user-1",
+				"race_name":       "Vegan Federation",
+				"status":          "pending",
+				"created_at":      created.Format(time.RFC3339Nano),
+				"expires_at":      expires.Format(time.RFC3339Nano),
+			}},
+		})
+	}))
+	t.Cleanup(server.Close)
+
+	client := newRESTClient(t, server)
+	payload := mustEncode(t, transcoder.MyInvitesListRequestToPayload, &lobbymodel.MyInvitesListRequest{})
+	result, err := client.ExecuteLobbyCommand(context.Background(), newAuthCommand(t, lobbymodel.MessageTypeMyInvitesList, payload))
+	require.NoError(t, err)
+	assert.Equal(t, "ok", result.ResultCode)
+
+	decoded, err := transcoder.PayloadToMyInvitesListResponse(result.PayloadBytes)
+	require.NoError(t, err)
+	require.Len(t, decoded.Items, 1)
+	assert.Equal(t, "user-1", decoded.Items[0].InvitedUserID)
+	assert.Empty(t, decoded.Items[0].Code)
+	assert.Equal(t, expires, decoded.Items[0].ExpiresAt)
+}
+
+func TestExecuteLobbyGameCreatePostsPrivateAndProjectsToSummary(t *testing.T) {
+	t.Parallel()
+
+	enrollment := time.Date(2026, 6, 1, 12, 0, 0, 0, time.UTC)
+	created := time.Date(2026, 5, 7, 10, 0, 0, 0, time.UTC)
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		require.Equal(t, http.MethodPost, r.Method)
+		require.Equal(t, "/api/v1/user/lobby/games", r.URL.Path)
+
+		var body map[string]any
+		raw, err := io.ReadAll(r.Body)
+		require.NoError(t, err)
+		require.NoError(t, json.Unmarshal(raw, &body))
+		assert.Equal(t, "private", body["visibility"])
+		assert.Equal(t, "First Contact", body["game_name"])
+		assert.Equal(t, "0 0 * * *", body["turn_schedule"])
+
+		// Backend always returns the full GameDetail including runtime
+		// snapshot fields the gateway must tolerate.
+		writeJSON(t, w, http.StatusCreated, map[string]any{
+			"game_id":               "newly-created",
+			"game_name":             "First Contact",
+			"game_type":             "private",
+			"status":                "draft",
+			"owner_user_id":         "user-1",
+			"min_players":           2,
+			"max_players":           8,
+			"enrollment_ends_at":    enrollment.Format(time.RFC3339Nano),
+			"created_at":            created.Format(time.RFC3339Nano),
+			"updated_at":            created.Format(time.RFC3339Nano),
+			"visibility":            "private",
+			"description":           "",
+			"turn_schedule":         "0 0 * * *",
+			"target_engine_version": "v1",
+			"start_gap_hours":       24,
+			"start_gap_players":     2,
+			"current_turn":          0,
+			"runtime_status":        "",
+		})
+	}))
+	t.Cleanup(server.Close)
+
+	client := newRESTClient(t, server)
+	payload := mustEncode(t, transcoder.GameCreateRequestToPayload, &lobbymodel.GameCreateRequest{
+		GameName:            "First Contact",
+		Description:         "",
+		MinPlayers:          2,
+		MaxPlayers:          8,
+		StartGapHours:       24,
+		StartGapPlayers:     2,
+		EnrollmentEndsAt:    enrollment,
+		TurnSchedule:        "0 0 * * *",
+		TargetEngineVersion: "v1",
+	})
+	result, err := client.ExecuteLobbyCommand(context.Background(), newAuthCommand(t, lobbymodel.MessageTypeGameCreate, payload))
+	require.NoError(t, err)
+	assert.Equal(t, "ok", result.ResultCode)
+
+	decoded, err := transcoder.PayloadToGameCreateResponse(result.PayloadBytes)
+	require.NoError(t, err)
+	assert.Equal(t, "newly-created", decoded.Game.GameID)
+	assert.Equal(t, "draft", decoded.Game.Status)
+}
+
+func TestExecuteLobbyGameCreateRejectsEmptyGameName(t *testing.T) {
+	t.Parallel()
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+		t.Errorf("backend must not be hit on validation failure")
+		w.WriteHeader(http.StatusInternalServerError)
+	}))
+	t.Cleanup(server.Close)
+
+	client := newRESTClient(t, server)
+	payload := mustEncode(t, transcoder.GameCreateRequestToPayload, &lobbymodel.GameCreateRequest{
+		MinPlayers:          2,
+		MaxPlayers:          8,
+		EnrollmentEndsAt:    time.Date(2026, 6, 1, 12, 0, 0, 0, time.UTC),
+		TurnSchedule:        "0 0 * * *",
+		TargetEngineVersion: "v1",
+	})
+	_, err := client.ExecuteLobbyCommand(context.Background(), newAuthCommand(t, lobbymodel.MessageTypeGameCreate, payload))
+	require.Error(t, err)
+	assert.Contains(t, err.Error(), "game_name must not be empty")
+}
+
+func TestExecuteLobbyApplicationSubmitPostsRaceName(t *testing.T) {
+	t.Parallel()
+
+	created := time.Date(2026, 5, 5, 10, 0, 0, 0, time.UTC)
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		require.Equal(t, http.MethodPost, r.Method)
+		require.Equal(t, "/api/v1/user/lobby/games/public-1/applications", r.URL.Path)
+
+		var body map[string]any
+		raw, err := io.ReadAll(r.Body)
+		require.NoError(t, err)
+		require.NoError(t, json.Unmarshal(raw, &body))
+		assert.Equal(t, "Vegan Federation", body["race_name"])
+
+		writeJSON(t, w, http.StatusCreated, map[string]any{
+			"application_id":    "app-3",
+			"game_id":           "public-1",
+			"applicant_user_id": "user-1",
+			"race_name":         "Vegan Federation",
+			"status":            "pending",
+			"created_at":        created.Format(time.RFC3339Nano),
+		})
+	}))
+	t.Cleanup(server.Close)
+
+	client := newRESTClient(t, server)
+	payload := mustEncode(t, transcoder.ApplicationSubmitRequestToPayload, &lobbymodel.ApplicationSubmitRequest{
+		GameID:   "public-1",
+		RaceName: "Vegan Federation",
+	})
+	result, err := client.ExecuteLobbyCommand(context.Background(), newAuthCommand(t, lobbymodel.MessageTypeApplicationSubmit, payload))
+	require.NoError(t, err)
+	assert.Equal(t, "ok", result.ResultCode)
+
+	decoded, err := transcoder.PayloadToApplicationSubmitResponse(result.PayloadBytes)
+	require.NoError(t, err)
+	assert.Equal(t, "app-3", decoded.Application.ApplicationID)
+	assert.Equal(t, "pending", decoded.Application.Status)
+}
+
+func TestExecuteLobbyInviteRedeemPostsToBackend(t *testing.T) {
+	t.Parallel()
+
+	created := time.Date(2026, 5, 5, 10, 0, 0, 0, time.UTC)
+	expires := time.Date(2026, 5, 8, 10, 0, 0, 0, time.UTC)
+	decided := time.Date(2026, 5, 6, 12, 0, 0, 0, time.UTC)
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		require.Equal(t, http.MethodPost, r.Method)
+		require.Equal(t, "/api/v1/user/lobby/games/private-1/invites/invite-1/redeem", r.URL.Path)
+		writeJSON(t, w, http.StatusOK, map[string]any{
+			"invite_id":       "invite-1",
+			"game_id":         "private-1",
+			"inviter_user_id": "user-host",
+			"invited_user_id": "user-1",
+			"race_name":       "Vegan Federation",
+			"status":          "accepted",
+			"created_at":      created.Format(time.RFC3339Nano),
+			"expires_at":      expires.Format(time.RFC3339Nano),
+			"decided_at":      decided.Format(time.RFC3339Nano),
+		})
+	}))
+	t.Cleanup(server.Close)
+
+	client := newRESTClient(t, server)
+	payload := mustEncode(t, transcoder.InviteRedeemRequestToPayload, &lobbymodel.InviteRedeemRequest{GameID: "private-1", InviteID: "invite-1"})
+	result, err := client.ExecuteLobbyCommand(context.Background(), newAuthCommand(t, lobbymodel.MessageTypeInviteRedeem, payload))
+	require.NoError(t, err)
+	assert.Equal(t, "ok", result.ResultCode)
+
+	decoded, err := transcoder.PayloadToInviteRedeemResponse(result.PayloadBytes)
+	require.NoError(t, err)
+	assert.Equal(t, "accepted", decoded.Invite.Status)
+}
+
+func TestExecuteLobbyInviteDeclinePostsToBackend(t *testing.T) {
+	t.Parallel()
+
+	created := time.Date(2026, 5, 5, 10, 0, 0, 0, time.UTC)
+	expires := time.Date(2026, 5, 8, 10, 0, 0, 0, time.UTC)
+	decided := time.Date(2026, 5, 6, 12, 0, 0, 0, time.UTC)
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		require.Equal(t, http.MethodPost, r.Method)
+		require.Equal(t, "/api/v1/user/lobby/games/private-1/invites/invite-1/decline", r.URL.Path)
+		writeJSON(t, w, http.StatusOK, map[string]any{
+			"invite_id":       "invite-1",
+			"game_id":         "private-1",
+			"inviter_user_id": "user-host",
+			"invited_user_id": "user-1",
+			"race_name":       "Vegan Federation",
+			"status":          "declined",
+			"created_at":      created.Format(time.RFC3339Nano),
+			"expires_at":      expires.Format(time.RFC3339Nano),
+			"decided_at":      decided.Format(time.RFC3339Nano),
+		})
+	}))
+	t.Cleanup(server.Close)
+
+	client := newRESTClient(t, server)
+	payload := mustEncode(t, transcoder.InviteDeclineRequestToPayload, &lobbymodel.InviteDeclineRequest{GameID: "private-1", InviteID: "invite-1"})
+	result, err := client.ExecuteLobbyCommand(context.Background(), newAuthCommand(t, lobbymodel.MessageTypeInviteDecline, payload))
+	require.NoError(t, err)
+	assert.Equal(t, "ok", result.ResultCode)
+
+	decoded, err := transcoder.PayloadToInviteDeclineResponse(result.PayloadBytes)
+	require.NoError(t, err)
+	assert.Equal(t, "declined", decoded.Invite.Status)
+}
+
+func TestExecuteLobbyProjectsBackendErrorAcrossCommands(t *testing.T) {
+	t.Parallel()
+
+	cases := []struct {
+		name        string
+		messageType string
+		payload     []byte
+		statusCode  int
+		want        string
+	}{
+		{
+			name:        "public games conflict",
+			messageType: lobbymodel.MessageTypePublicGamesList,
+			payload:     mustEncode(t, transcoder.PublicGamesListRequestToPayload, &lobbymodel.PublicGamesListRequest{Page: 1, PageSize: 50}),
+			statusCode:  http.StatusConflict,
+			want:        "conflict",
+		},
+		{
+			name:        "applications forbidden",
+			messageType: lobbymodel.MessageTypeApplicationSubmit,
+			payload:     mustEncode(t, transcoder.ApplicationSubmitRequestToPayload, &lobbymodel.ApplicationSubmitRequest{GameID: "g", RaceName: "r"}),
+			statusCode:  http.StatusForbidden,
+			want:        "forbidden",
+		},
+		{
+			name:        "invite redeem not found",
+			messageType: lobbymodel.MessageTypeInviteRedeem,
+			payload:     mustEncode(t, transcoder.InviteRedeemRequestToPayload, &lobbymodel.InviteRedeemRequest{GameID: "g", InviteID: "i"}),
+			statusCode:  http.StatusNotFound,
+			want:        "subject_not_found",
+		},
+		{
+			name:        "create invalid request",
+			messageType: lobbymodel.MessageTypeGameCreate,
+			payload:     mustEncode(t, transcoder.GameCreateRequestToPayload, validCreateRequest()),
+			statusCode:  http.StatusBadRequest,
+			want:        "invalid_request",
+		},
+	}
+
+	for _, tc := range cases {
+		tc := tc
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+			server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+				writeJSON(t, w, tc.statusCode, map[string]any{
+					"error": map[string]any{"code": tc.want, "message": "from backend"},
+				})
+			}))
+			t.Cleanup(server.Close)
+
+			client := newRESTClient(t, server)
+			result, err := client.ExecuteLobbyCommand(context.Background(), newAuthCommand(t, tc.messageType, tc.payload))
+			require.NoError(t, err)
+			assert.Equal(t, tc.want, result.ResultCode)
+
+			errResp, err := transcoder.PayloadToLobbyErrorResponse(result.PayloadBytes)
+			require.NoError(t, err)
+			assert.Equal(t, tc.want, errResp.Error.Code)
+			assert.Equal(t, "from backend", errResp.Error.Message)
+		})
+	}
+}
+
+func TestExecuteLobbyMapsServiceUnavailableToDownstreamError(t *testing.T) {
+	t.Parallel()
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+		w.WriteHeader(http.StatusServiceUnavailable)
+	}))
+	t.Cleanup(server.Close)
+
+	client := newRESTClient(t, server)
+	payload := mustEncode(t, transcoder.MyGamesListRequestToPayload, &lobbymodel.MyGamesListRequest{})
+	_, err := client.ExecuteLobbyCommand(context.Background(), newAuthCommand(t, lobbymodel.MessageTypeMyGamesList, payload))
+	require.Error(t, err)
+	assert.True(t, errors.Is(err, downstream.ErrDownstreamUnavailable))
+}
+
+func TestExecuteLobbyRejectsUnknownMessageType(t *testing.T) {
+	t.Parallel()
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+		w.WriteHeader(http.StatusOK)
+	}))
+	t.Cleanup(server.Close)
+
+	client := newRESTClient(t, server)
+	_, err := client.ExecuteLobbyCommand(context.Background(), newAuthCommand(t, "lobby.unknown", []byte{0x01}))
+	require.Error(t, err)
+	assert.True(t, strings.Contains(err.Error(), "unsupported message type"))
+}
+
+func validCreateRequest() *lobbymodel.GameCreateRequest {
+	return &lobbymodel.GameCreateRequest{
+		GameName:            "Test",
+		Description:         "",
+		MinPlayers:          2,
+		MaxPlayers:          8,
+		StartGapHours:       24,
+		StartGapPlayers:     2,
+		EnrollmentEndsAt:    time.Date(2026, 6, 1, 12, 0, 0, 0, time.UTC),
+		TurnSchedule:        "0 0 * * *",
+		TargetEngineVersion: "v1",
+	}
+}

gateway/internal/backendclient/routes.go

@@ -38,8 +38,15 @@ func LobbyRoutes(client *RESTClient) map[string]downstream.Client {
 		target = lobbyCommandClient{rest: client}
 	}
 	return map[string]downstream.Client{
-		lobbymodel.MessageTypeMyGamesList:    target,
-		lobbymodel.MessageTypeOpenEnrollment: target,
+		lobbymodel.MessageTypeMyGamesList:          target,
+		lobbymodel.MessageTypePublicGamesList:      target,
+		lobbymodel.MessageTypeMyApplicationsList:   target,
+		lobbymodel.MessageTypeMyInvitesList:        target,
+		lobbymodel.MessageTypeOpenEnrollment:       target,
+		lobbymodel.MessageTypeGameCreate:           target,
+		lobbymodel.MessageTypeApplicationSubmit:    target,
+		lobbymodel.MessageTypeInviteRedeem:         target,
+		lobbymodel.MessageTypeInviteDecline:        target,
 	}
 }
 
@@ -53,9 +60,10 @@ func GameRoutes(client *RESTClient) map[string]downstream.Client {
 		target = gameCommandClient{rest: client}
 	}
 	return map[string]downstream.Client{
-		ordermodel.MessageTypeUserGamesCommand:  target,
-		ordermodel.MessageTypeUserGamesOrder:    target,
-		reportmodel.MessageTypeUserGamesReport:  target,
+		ordermodel.MessageTypeUserGamesCommand:   target,
+		ordermodel.MessageTypeUserGamesOrder:     target,
+		ordermodel.MessageTypeUserGamesOrderGet:  target,
+		reportmodel.MessageTypeUserGamesReport:   target,
 	}
 }
 

gateway/internal/backendclient/routes_test.go

@@ -0,0 +1,106 @@
+package backendclient_test
+
+import (
+	"context"
+	"testing"
+
+	"galaxy/gateway/internal/backendclient"
+	"galaxy/gateway/internal/downstream"
+	lobbymodel "galaxy/model/lobby"
+	ordermodel "galaxy/model/order"
+	reportmodel "galaxy/model/report"
+	usermodel "galaxy/model/user"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+// Phase 14 follow-up: every authenticated message-type constant
+// declared in `pkg/model/<service>` must be wired into the matching
+// route table. Without this regression test, adding a new constant
+// without registering it surfaces only at runtime as
+// `unimplemented: message_type is not routed` — exactly what the
+// owner saw when an outdated gateway image missed
+// `user.games.order.get`.
+func TestRoutesCoverAllAuthenticatedMessageTypes(t *testing.T) {
+	t.Parallel()
+
+	cases := map[string]struct {
+		expected []string
+		actual   map[string]downstream.Client
+	}{
+		"user": {
+			expected: []string{
+				usermodel.MessageTypeGetMyAccount,
+				usermodel.MessageTypeUpdateMyProfile,
+				usermodel.MessageTypeUpdateMySettings,
+				usermodel.MessageTypeListMySessions,
+				usermodel.MessageTypeRevokeMySession,
+				usermodel.MessageTypeRevokeAllMySessions,
+			},
+			actual: backendclient.UserRoutes(nil),
+		},
+		"lobby": {
+			expected: []string{
+				lobbymodel.MessageTypeMyGamesList,
+				lobbymodel.MessageTypePublicGamesList,
+				lobbymodel.MessageTypeMyApplicationsList,
+				lobbymodel.MessageTypeMyInvitesList,
+				lobbymodel.MessageTypeOpenEnrollment,
+				lobbymodel.MessageTypeGameCreate,
+				lobbymodel.MessageTypeApplicationSubmit,
+				lobbymodel.MessageTypeInviteRedeem,
+				lobbymodel.MessageTypeInviteDecline,
+			},
+			actual: backendclient.LobbyRoutes(nil),
+		},
+		"game": {
+			expected: []string{
+				ordermodel.MessageTypeUserGamesCommand,
+				ordermodel.MessageTypeUserGamesOrder,
+				ordermodel.MessageTypeUserGamesOrderGet,
+				reportmodel.MessageTypeUserGamesReport,
+			},
+			actual: backendclient.GameRoutes(nil),
+		},
+	}
+
+	for name, tc := range cases {
+		t.Run(name, func(t *testing.T) {
+			t.Parallel()
+			require.Len(t, tc.actual, len(tc.expected),
+				"%s routes table size diverges from the expected message-type list", name)
+			for _, mt := range tc.expected {
+				client, ok := tc.actual[mt]
+				assert.Truef(t, ok, "%s routes are missing %q", name, mt)
+				assert.NotNilf(t, client, "%s routes resolve %q to a nil client", name, mt)
+			}
+		})
+	}
+}
+
+// Sanity-check that the order-get route really points at the game
+// command client (and not, say, the lobby one if a future refactor
+// reshuffles the helpers): the route table must dispatch through
+// `gameCommandClient.ExecuteCommand`, which in turn calls
+// `RESTClient.ExecuteGameCommand`. We exercise this through the
+// public Router contract.
+func TestUserGamesOrderGetRoutedToGameClient(t *testing.T) {
+	t.Parallel()
+
+	routes := backendclient.GameRoutes(nil)
+	router := downstream.NewStaticRouter(routes)
+
+	client, err := router.Route(ordermodel.MessageTypeUserGamesOrderGet)
+	require.NoError(t, err)
+	require.NotNil(t, client)
+
+	// Without a live RESTClient the client is the unavailable stub —
+	// calling ExecuteCommand surfaces the canonical "downstream
+	// service is unavailable" sentinel rather than the "not routed"
+	// error we want to keep regression-tested.
+	_, err = client.ExecuteCommand(context.Background(), downstream.AuthenticatedCommand{
+		MessageType: ordermodel.MessageTypeUserGamesOrderGet,
+	})
+	assert.ErrorIs(t, err, downstream.ErrDownstreamUnavailable)
+}

gateway/internal/grpcapi/command_routing_integration_test.go

@@ -11,14 +11,12 @@ import (
 	"galaxy/gateway/internal/config"
 	"galaxy/gateway/internal/downstream"
 	"galaxy/gateway/internal/testutil"
-	gatewayv1 "galaxy/gateway/proto/galaxy/gateway/v1"
 
+	"connectrpc.com/connect"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"go.opentelemetry.io/otel/trace"
 	"go.uber.org/zap"
-	"google.golang.org/grpc/codes"
-	"google.golang.org/grpc/status"
 )
 
 func TestExecuteCommandRoutesVerifiedCommandAndSignsResponse(t *testing.T) {
@@ -58,32 +56,27 @@ func TestExecuteCommandRoutesVerifiedCommandAndSignsResponse(t *testing.T) {
 	defer runGateway.stop(t)
 
 	addr := waitForListenAddr(t, server)
-	conn := dialGatewayClient(t, addr)
-	defer func() {
-		require.NoError(t, conn.Close())
-	}()
-
-	client := gatewayv1.NewEdgeGatewayClient(conn)
-	response, err := client.ExecuteCommand(context.Background(), newValidExecuteCommandRequest())
+	client := newEdgeClient(t, addr)
+	response, err := client.ExecuteCommand(context.Background(), connect.NewRequest(newValidExecuteCommandRequest()))
 	require.NoError(t, err)
 
-	assert.Equal(t, "v1", response.GetProtocolVersion())
-	assert.Equal(t, "request-123", response.GetRequestId())
-	assert.Equal(t, testCurrentTime.UnixMilli(), response.GetTimestampMs())
-	assert.Equal(t, "accepted", response.GetResultCode())
-	assert.Equal(t, []byte("downstream-response"), response.GetPayloadBytes())
+	assert.Equal(t, "v1", response.Msg.GetProtocolVersion())
+	assert.Equal(t, "request-123", response.Msg.GetRequestId())
+	assert.Equal(t, testCurrentTime.UnixMilli(), response.Msg.GetTimestampMs())
+	assert.Equal(t, "accepted", response.Msg.GetResultCode())
+	assert.Equal(t, []byte("downstream-response"), response.Msg.GetPayloadBytes())
 	assert.Equal(t, 1, moveClient.executeCalls)
 	assert.Zero(t, renameClient.executeCalls)
 
 	wantHash := sha256.Sum256([]byte("downstream-response"))
-	assert.Equal(t, wantHash[:], response.GetPayloadHash())
-	require.NoError(t, authn.VerifyPayloadHash(response.GetPayloadBytes(), response.GetPayloadHash()))
-	require.NoError(t, authn.VerifyResponseSignature(signer.PublicKey(), response.GetSignature(), authn.ResponseSigningFields{
-		ProtocolVersion: response.GetProtocolVersion(),
-		RequestID:       response.GetRequestId(),
-		TimestampMS:     response.GetTimestampMs(),
-		ResultCode:      response.GetResultCode(),
-		PayloadHash:     response.GetPayloadHash(),
+	assert.Equal(t, wantHash[:], response.Msg.GetPayloadHash())
+	require.NoError(t, authn.VerifyPayloadHash(response.Msg.GetPayloadBytes(), response.Msg.GetPayloadHash()))
+	require.NoError(t, authn.VerifyResponseSignature(signer.PublicKey(), response.Msg.GetSignature(), authn.ResponseSigningFields{
+		ProtocolVersion: response.Msg.GetProtocolVersion(),
+		RequestID:       response.Msg.GetRequestId(),
+		TimestampMS:     response.Msg.GetTimestampMs(),
+		ResultCode:      response.Msg.GetResultCode(),
+		PayloadHash:     response.Msg.GetPayloadHash(),
 	}))
 }
 
@@ -99,16 +92,11 @@ func TestExecuteCommandRouteMissReturnsUnimplemented(t *testing.T) {
 	defer runGateway.stop(t)
 
 	addr := waitForListenAddr(t, server)
-	conn := dialGatewayClient(t, addr)
-	defer func() {
-		require.NoError(t, conn.Close())
-	}()
-
-	client := gatewayv1.NewEdgeGatewayClient(conn)
-	_, err := client.ExecuteCommand(context.Background(), newValidExecuteCommandRequest())
+	client := newEdgeClient(t, addr)
+	_, err := client.ExecuteCommand(context.Background(), connect.NewRequest(newValidExecuteCommandRequest()))
 	require.Error(t, err)
-	assert.Equal(t, codes.Unimplemented, status.Code(err))
-	assert.Equal(t, "message_type is not routed", status.Convert(err).Message())
+	assert.Equal(t, connect.CodeUnimplemented, connect.CodeOf(err))
+	assert.Equal(t, "message_type is not routed", connectErrorMessage(t, err))
 }
 
 func TestExecuteCommandMapsDownstreamUnavailableToUnavailable(t *testing.T) {
@@ -131,16 +119,11 @@ func TestExecuteCommandMapsDownstreamUnavailableToUnavailable(t *testing.T) {
 	defer runGateway.stop(t)
 
 	addr := waitForListenAddr(t, server)
-	conn := dialGatewayClient(t, addr)
-	defer func() {
-		require.NoError(t, conn.Close())
-	}()
-
-	client := gatewayv1.NewEdgeGatewayClient(conn)
-	_, err := client.ExecuteCommand(context.Background(), newValidExecuteCommandRequest())
+	client := newEdgeClient(t, addr)
+	_, err := client.ExecuteCommand(context.Background(), connect.NewRequest(newValidExecuteCommandRequest()))
 	require.Error(t, err)
-	assert.Equal(t, codes.Unavailable, status.Code(err))
-	assert.Equal(t, "downstream service is unavailable", status.Convert(err).Message())
+	assert.Equal(t, connect.CodeUnavailable, connect.CodeOf(err))
+	assert.Equal(t, "downstream service is unavailable", connectErrorMessage(t, err))
 	assert.Equal(t, 1, failingClient.executeCalls)
 }
 
@@ -167,16 +150,11 @@ func TestExecuteCommandMapsDownstreamTimeoutToUnavailable(t *testing.T) {
 	defer runGateway.stop(t)
 
 	addr := waitForListenAddr(t, server)
-	conn := dialGatewayClient(t, addr)
-	defer func() {
-		require.NoError(t, conn.Close())
-	}()
-
-	client := gatewayv1.NewEdgeGatewayClient(conn)
-	_, err := client.ExecuteCommand(context.Background(), newValidExecuteCommandRequest())
+	client := newEdgeClient(t, addr)
+	_, err := client.ExecuteCommand(context.Background(), connect.NewRequest(newValidExecuteCommandRequest()))
 	require.Error(t, err)
-	assert.Equal(t, codes.Unavailable, status.Code(err))
-	assert.Equal(t, "downstream service is unavailable", status.Convert(err).Message())
+	assert.Equal(t, connect.CodeUnavailable, connect.CodeOf(err))
+	assert.Equal(t, "downstream service is unavailable", connectErrorMessage(t, err))
 	assert.Equal(t, 1, stallingClient.executeCalls)
 }
 
@@ -203,16 +181,11 @@ func TestExecuteCommandFailsClosedWhenResponseSignerUnavailable(t *testing.T) {
 	defer runGateway.stop(t)
 
 	addr := waitForListenAddr(t, server)
-	conn := dialGatewayClient(t, addr)
-	defer func() {
-		require.NoError(t, conn.Close())
-	}()
-
-	client := gatewayv1.NewEdgeGatewayClient(conn)
-	_, err := client.ExecuteCommand(context.Background(), newValidExecuteCommandRequest())
+	client := newEdgeClient(t, addr)
+	_, err := client.ExecuteCommand(context.Background(), connect.NewRequest(newValidExecuteCommandRequest()))
 	require.Error(t, err)
-	assert.Equal(t, codes.Unavailable, status.Code(err))
-	assert.Equal(t, "response signer is unavailable", status.Convert(err).Message())
+	assert.Equal(t, connect.CodeUnavailable, connect.CodeOf(err))
+	assert.Equal(t, "response signer is unavailable", connectErrorMessage(t, err))
 	assert.Equal(t, 1, successClient.executeCalls)
 }
 
@@ -250,13 +223,8 @@ func TestExecuteCommandPropagatesOTelSpanContextToDownstream(t *testing.T) {
 	defer runGateway.stop(t)
 
 	addr := waitForListenAddr(t, server)
-	conn := dialGatewayClient(t, addr)
-	defer func() {
-		require.NoError(t, conn.Close())
-	}()
-
-	client := gatewayv1.NewEdgeGatewayClient(conn)
-	_, err := client.ExecuteCommand(context.Background(), newValidExecuteCommandRequest())
+	client := newEdgeClient(t, addr)
+	_, err := client.ExecuteCommand(context.Background(), connect.NewRequest(newValidExecuteCommandRequest()))
 	require.NoError(t, err)
 
 	assert.True(t, seenSpanContext.IsValid())
@@ -290,15 +258,10 @@ func TestExecuteCommandDrainsInFlightUnaryDuringShutdown(t *testing.T) {
 	defer runGateway.stop(t)
 
 	addr := waitForListenAddr(t, server)
-	conn := dialGatewayClient(t, addr)
-	defer func() {
-		require.NoError(t, conn.Close())
-	}()
-
-	client := gatewayv1.NewEdgeGatewayClient(conn)
+	client := newEdgeClient(t, addr)
 	resultCh := make(chan error, 1)
 	go func() {
-		_, err := client.ExecuteCommand(context.Background(), newValidExecuteCommandRequest())
+		_, err := client.ExecuteCommand(context.Background(), connect.NewRequest(newValidExecuteCommandRequest()))
 		resultCh <- err
 	}()
 
@@ -353,13 +316,8 @@ func TestExecuteCommandLogsDoNotContainSensitiveTransportMaterial(t *testing.T)
 	defer runGateway.stop(t)
 
 	addr := waitForListenAddr(t, server)
-	conn := dialGatewayClient(t, addr)
-	defer func() {
-		require.NoError(t, conn.Close())
-	}()
-
-	client := gatewayv1.NewEdgeGatewayClient(conn)
-	_, err := client.ExecuteCommand(context.Background(), newValidExecuteCommandRequest())
+	client := newEdgeClient(t, addr)
+	_, err := client.ExecuteCommand(context.Background(), connect.NewRequest(newValidExecuteCommandRequest()))
 	require.NoError(t, err)
 
 	logOutput := logBuffer.String()

gateway/internal/grpcapi/connect_handler.go

@@ -0,0 +1,143 @@
+package grpcapi
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	gatewayv1 "galaxy/gateway/proto/galaxy/gateway/v1"
+	"galaxy/gateway/proto/galaxy/gateway/v1/gatewayv1connect"
+
+	"connectrpc.com/connect"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/metadata"
+	grpcstatus "google.golang.org/grpc/status"
+)
+
+// connectEdgeAdapter exposes the existing gRPC-shaped authenticated edge
+// service decorator stack (envelope → session → payload-hash → signature →
+// freshness/replay → rate-limit → routing/push) through the
+// gatewayv1connect.EdgeGatewayHandler interface. It owns no logic of its
+// own; the underlying decorator stack carries the full ingress contract
+// unchanged.
+type connectEdgeAdapter struct {
+	impl gatewayv1.EdgeGatewayServer
+}
+
+// newConnectEdgeAdapter wraps impl as a Connect handler.
+func newConnectEdgeAdapter(impl gatewayv1.EdgeGatewayServer) gatewayv1connect.EdgeGatewayHandler {
+	return &connectEdgeAdapter{impl: impl}
+}
+
+// ExecuteCommand unwraps the typed Connect request, calls the underlying
+// service, and wraps the typed response. gRPC `status.Error` values
+// returned by the decorator stack are translated to *connect.Error so
+// the Connect client receives the matching code and message.
+func (a *connectEdgeAdapter) ExecuteCommand(ctx context.Context, req *connect.Request[gatewayv1.ExecuteCommandRequest]) (*connect.Response[gatewayv1.ExecuteCommandResponse], error) {
+	resp, err := a.impl.ExecuteCommand(ctx, req.Msg)
+	if err != nil {
+		return nil, translateGRPCStatusError(err)
+	}
+
+	return connect.NewResponse(resp), nil
+}
+
+// SubscribeEvents adapts the Connect server stream to the
+// grpc.ServerStreamingServer contract expected by the existing decorator
+// stack. The decorator stack only ever calls Send and Context on the
+// stream; the remaining grpc.ServerStream surface is satisfied by no-op
+// shims so the interface contract is met without panicking. Errors
+// returned by the decorator stack are translated to *connect.Error.
+func (a *connectEdgeAdapter) SubscribeEvents(ctx context.Context, req *connect.Request[gatewayv1.SubscribeEventsRequest], stream *connect.ServerStream[gatewayv1.GatewayEvent]) error {
+	wrapped := &connectEdgeStream{ctx: ctx, stream: stream}
+	if err := a.impl.SubscribeEvents(req.Msg, wrapped); err != nil {
+		return translateGRPCStatusError(err)
+	}
+
+	return nil
+}
+
+// translateGRPCStatusError maps gRPC status.Error values returned by the
+// decorator stack into *connect.Error with the equivalent code and message.
+// Errors that are already *connect.Error pass through unchanged. Errors
+// without a recognisable gRPC status are returned verbatim — connect-go
+// renders those as CodeUnknown.
+func translateGRPCStatusError(err error) error {
+	if err == nil {
+		return nil
+	}
+
+	var connectErr *connect.Error
+	if errors.As(err, &connectErr) {
+		return err
+	}
+
+	grpcStatus, ok := grpcstatus.FromError(err)
+	if !ok {
+		return err
+	}
+	if grpcStatus.Code() == codes.OK {
+		return nil
+	}
+
+	return connect.NewError(connect.Code(grpcStatus.Code()), errors.New(grpcStatus.Message()))
+}
+
+// connectEdgeStream satisfies grpc.ServerStreamingServer[gatewayv1.GatewayEvent]
+// on top of *connect.ServerStream. The decorator stack reads the request
+// context and pushes outbound events through Send; the rest of the
+// grpc.ServerStream surface is not exercised in the gateway, so the no-op
+// implementations preserve the type contract without surprising behaviour.
+type connectEdgeStream struct {
+	ctx    context.Context
+	stream *connect.ServerStream[gatewayv1.GatewayEvent]
+}
+
+// Send forwards a typed gateway event through the underlying Connect server
+// stream.
+func (s *connectEdgeStream) Send(event *gatewayv1.GatewayEvent) error {
+	return s.stream.Send(event)
+}
+
+// Context returns the request context handed to the Connect handler.
+func (s *connectEdgeStream) Context() context.Context {
+	return s.ctx
+}
+
+// SetHeader is part of grpc.ServerStream. The Connect transport exposes
+// response headers through ResponseHeader() at construction time; metadata
+// supplied here is intentionally ignored because no decorator in the
+// gateway exercises the gRPC-only metadata path.
+func (s *connectEdgeStream) SetHeader(metadata.MD) error {
+	return nil
+}
+
+// SendHeader is part of grpc.ServerStream. Connect-served streams flush
+// headers automatically on the first Send; manual header dispatch is not
+// modelled.
+func (s *connectEdgeStream) SendHeader(metadata.MD) error {
+	return nil
+}
+
+// SetTrailer is part of grpc.ServerStream. Trailer metadata has no
+// corresponding Connect concept on server-streaming responses.
+func (s *connectEdgeStream) SetTrailer(metadata.MD) {}
+
+// SendMsg is part of grpc.ServerStream. The decorator stack never calls
+// SendMsg directly; if a future caller does, the typed Send path is used
+// when the message is a GatewayEvent.
+func (s *connectEdgeStream) SendMsg(m any) error {
+	event, ok := m.(*gatewayv1.GatewayEvent)
+	if !ok {
+		return fmt.Errorf("connectEdgeStream.SendMsg: unsupported message type %T", m)
+	}
+
+	return s.stream.Send(event)
+}
+
+// RecvMsg is part of grpc.ServerStream. Server-streaming server handlers
+// have no client messages to receive after the initial request, so this
+// method is intentionally an error path.
+func (s *connectEdgeStream) RecvMsg(any) error {
+	return errors.New("connectEdgeStream.RecvMsg: server-streaming has no client messages")
+}

gateway/internal/grpcapi/connect_observability.go

@@ -0,0 +1,110 @@
+package grpcapi
+
+import (
+	"context"
+	"net"
+	"time"
+
+	"galaxy/gateway/internal/telemetry"
+
+	"connectrpc.com/connect"
+	"go.uber.org/zap"
+)
+
+// observabilityConnectInterceptor returns a Connect interceptor that records
+// the same structured log entry and authenticated edge metric pair as the
+// gRPC instrumentation it replaced. It also injects the parsed peer IP into
+// the request context so the rate-limit decorator can attribute requests
+// without depending on the gRPC `peer` package.
+func observabilityConnectInterceptor(logger *zap.Logger, metrics *telemetry.Runtime) connect.Interceptor {
+	if logger == nil {
+		logger = zap.NewNop()
+	}
+
+	return &connectObservability{logger: logger, metrics: metrics}
+}
+
+type connectObservability struct {
+	logger  *zap.Logger
+	metrics *telemetry.Runtime
+}
+
+// WrapUnary records timing and outcome for a single unary edge call.
+func (o *connectObservability) WrapUnary(next connect.UnaryFunc) connect.UnaryFunc {
+	return func(ctx context.Context, req connect.AnyRequest) (connect.AnyResponse, error) {
+		ctx = contextWithPeerIP(ctx, hostFromConnectPeerAddr(req.Peer().Addr))
+
+		start := time.Now()
+		resp, err := next(ctx, req)
+
+		var respValue any
+		if resp != nil {
+			respValue = resp.Any()
+		}
+		recordEdgeRequest(o.logger, o.metrics, ctx, "connect", req.Spec().Procedure, req.Any(), respValue, err, time.Since(start), "unary")
+
+		return resp, err
+	}
+}
+
+// WrapStreamingClient is the client-side hook required by the
+// connect.Interceptor contract. The gateway only acts as a Connect server,
+// so this hook is a pass-through.
+func (o *connectObservability) WrapStreamingClient(next connect.StreamingClientFunc) connect.StreamingClientFunc {
+	return next
+}
+
+// WrapStreamingHandler records timing and outcome for one server-streaming
+// edge call. The wrapped conn captures the first received request so the
+// log/metric pair carries the same envelope fields the gRPC instrumentation
+// emitted before.
+func (o *connectObservability) WrapStreamingHandler(next connect.StreamingHandlerFunc) connect.StreamingHandlerFunc {
+	return func(ctx context.Context, conn connect.StreamingHandlerConn) error {
+		ctx = contextWithPeerIP(ctx, hostFromConnectPeerAddr(conn.Peer().Addr))
+
+		start := time.Now()
+		wrapped := &observabilityStreamingConn{StreamingHandlerConn: conn}
+		err := next(ctx, wrapped)
+
+		recordEdgeRequest(o.logger, o.metrics, ctx, "connect", conn.Spec().Procedure, wrapped.firstRequest, nil, err, time.Since(start), "stream")
+		return err
+	}
+}
+
+// observabilityStreamingConn captures the first received request so the
+// streaming-handler interceptor can derive the envelope log fields after
+// the handler returns.
+type observabilityStreamingConn struct {
+	connect.StreamingHandlerConn
+
+	firstRequest any
+}
+
+// Receive forwards to the underlying conn and stores the first successful
+// message, so envelopeFieldsFromRequest can read message_type, request_id,
+// and trace_id from it.
+func (c *observabilityStreamingConn) Receive(msg any) error {
+	err := c.StreamingHandlerConn.Receive(msg)
+	if err == nil && c.firstRequest == nil {
+		c.firstRequest = msg
+	}
+
+	return err
+}
+
+// hostFromConnectPeerAddr returns the host part of a "host:port" peer
+// address, or the address verbatim when it cannot be split. Empty input
+// yields an empty string so peerIPFromContext falls back to the canonical
+// `unknown` bucket.
+func hostFromConnectPeerAddr(addr string) string {
+	if addr == "" {
+		return ""
+	}
+
+	host, _, err := net.SplitHostPort(addr)
+	if err == nil && host != "" {
+		return host
+	}
+
+	return addr
+}

gateway/internal/grpcapi/envelope.go

@@ -4,8 +4,7 @@ import (
 	"bytes"
 	"context"
 	"fmt"
-
-	"galaxy/gateway/proto/galaxy/gateway/v1"
+	gatewayv1 "galaxy/gateway/proto/galaxy/gateway/v1"
 
 	"buf.build/go/protovalidate"
 	"google.golang.org/grpc"

gateway/internal/grpcapi/freshness_replay_integration_test.go

@@ -3,7 +3,6 @@ package grpcapi
 import (
 	"context"
 	"errors"
-	"io"
 	"sync"
 	"testing"
 	"time"
@@ -12,11 +11,10 @@ import (
 	"galaxy/gateway/internal/session"
 	gatewayv1 "galaxy/gateway/proto/galaxy/gateway/v1"
 
+	"connectrpc.com/connect"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"google.golang.org/grpc"
-	"google.golang.org/grpc/codes"
-	"google.golang.org/grpc/status"
 )
 
 func TestExecuteCommandRejectsStaleTimestamp(t *testing.T) {
@@ -51,16 +49,11 @@ func TestExecuteCommandRejectsStaleTimestamp(t *testing.T) {
 			defer runGateway.stop(t)
 
 			addr := waitForListenAddr(t, server)
-			conn := dialGatewayClient(t, addr)
-			defer func() {
-				require.NoError(t, conn.Close())
-			}()
-
-			client := gatewayv1.NewEdgeGatewayClient(conn)
-			_, err := client.ExecuteCommand(context.Background(), newValidExecuteCommandRequestWithTimestamp("device-session-123", "request-123", tt.timestampMS))
+			client := newEdgeClient(t, addr)
+			_, err := client.ExecuteCommand(context.Background(), connect.NewRequest(newValidExecuteCommandRequestWithTimestamp("device-session-123", "request-123", tt.timestampMS)))
 			require.Error(t, err)
-			assert.Equal(t, codes.FailedPrecondition, status.Code(err))
-			assert.Equal(t, "request timestamp is outside the freshness window", status.Convert(err).Message())
+			assert.Equal(t, connect.CodeFailedPrecondition, connect.CodeOf(err))
+			assert.Equal(t, "request timestamp is outside the freshness window", connectErrorMessage(t, err))
 			assert.Zero(t, delegate.executeCalls)
 		})
 	}
@@ -98,16 +91,11 @@ func TestSubscribeEventsRejectsStaleTimestamp(t *testing.T) {
 			defer runGateway.stop(t)
 
 			addr := waitForListenAddr(t, server)
-			conn := dialGatewayClient(t, addr)
-			defer func() {
-				require.NoError(t, conn.Close())
-			}()
-
-			client := gatewayv1.NewEdgeGatewayClient(conn)
+			client := newEdgeClient(t, addr)
 			err := subscribeEventsError(t, context.Background(), client, newValidSubscribeEventsRequestWithTimestamp("device-session-123", "request-123", tt.timestampMS))
 			require.Error(t, err)
-			assert.Equal(t, codes.FailedPrecondition, status.Code(err))
-			assert.Equal(t, "request timestamp is outside the freshness window", status.Convert(err).Message())
+			assert.Equal(t, connect.CodeFailedPrecondition, connect.CodeOf(err))
+			assert.Equal(t, "request timestamp is outside the freshness window", connectErrorMessage(t, err))
 			assert.Zero(t, delegate.subscribeCalls)
 		})
 	}
@@ -127,21 +115,16 @@ func TestExecuteCommandRejectsReplay(t *testing.T) {
 	defer runGateway.stop(t)
 
 	addr := waitForListenAddr(t, server)
-	conn := dialGatewayClient(t, addr)
-	defer func() {
-		require.NoError(t, conn.Close())
-	}()
-
-	client := gatewayv1.NewEdgeGatewayClient(conn)
+	client := newEdgeClient(t, addr)
 	req := newValidExecuteCommandRequest()
 
-	_, err := client.ExecuteCommand(context.Background(), req)
+	_, err := client.ExecuteCommand(context.Background(), connect.NewRequest(req))
 	require.NoError(t, err)
 
-	_, err = client.ExecuteCommand(context.Background(), req)
+	_, err = client.ExecuteCommand(context.Background(), connect.NewRequest(req))
 	require.Error(t, err)
-	assert.Equal(t, codes.FailedPrecondition, status.Code(err))
-	assert.Equal(t, "request replay detected", status.Convert(err).Message())
+	assert.Equal(t, connect.CodeFailedPrecondition, connect.CodeOf(err))
+	assert.Equal(t, "request replay detected", connectErrorMessage(t, err))
 	assert.Equal(t, 1, delegate.executeCalls)
 }
 
@@ -159,25 +142,20 @@ func TestSubscribeEventsRejectsReplay(t *testing.T) {
 	defer runGateway.stop(t)
 
 	addr := waitForListenAddr(t, server)
-	conn := dialGatewayClient(t, addr)
-	defer func() {
-		require.NoError(t, conn.Close())
-	}()
-
-	client := gatewayv1.NewEdgeGatewayClient(conn)
+	client := newEdgeClient(t, addr)
 	req := newValidSubscribeEventsRequest()
 
-	stream, err := client.SubscribeEvents(context.Background(), req)
+	stream, err := client.SubscribeEvents(context.Background(), connect.NewRequest(req))
 	require.NoError(t, err)
 	event := recvBootstrapEvent(t, stream)
 	assertServerTimeBootstrapEvent(t, event, newTestResponseSignerPublicKey(), "request-123", "trace-123", testCurrentTime.UnixMilli())
-	_, err = stream.Recv()
-	require.ErrorIs(t, err, io.EOF)
+	require.False(t, stream.Receive())
+	require.NoError(t, stream.Err())
 
 	err = subscribeEventsError(t, context.Background(), client, req)
 	require.Error(t, err)
-	assert.Equal(t, codes.FailedPrecondition, status.Code(err))
-	assert.Equal(t, "request replay detected", status.Convert(err).Message())
+	assert.Equal(t, connect.CodeFailedPrecondition, connect.CodeOf(err))
+	assert.Equal(t, "request replay detected", connectErrorMessage(t, err))
 	assert.Equal(t, 1, delegate.subscribeCalls)
 }
 
@@ -204,17 +182,12 @@ func TestExecuteCommandAllowsSameRequestIDAcrossDistinctSessions(t *testing.T) {
 	defer runGateway.stop(t)
 
 	addr := waitForListenAddr(t, server)
-	conn := dialGatewayClient(t, addr)
-	defer func() {
-		require.NoError(t, conn.Close())
-	}()
+	client := newEdgeClient(t, addr)
 
-	client := gatewayv1.NewEdgeGatewayClient(conn)
-
-	_, err := client.ExecuteCommand(context.Background(), newValidExecuteCommandRequestWithSessionAndRequestID("device-session-123", "request-shared"))
+	_, err := client.ExecuteCommand(context.Background(), connect.NewRequest(newValidExecuteCommandRequestWithSessionAndRequestID("device-session-123", "request-shared")))
 	require.NoError(t, err)
 
-	_, err = client.ExecuteCommand(context.Background(), newValidExecuteCommandRequestWithSessionAndRequestID("device-session-456", "request-shared"))
+	_, err = client.ExecuteCommand(context.Background(), connect.NewRequest(newValidExecuteCommandRequestWithSessionAndRequestID("device-session-456", "request-shared")))
 	require.NoError(t, err)
 
 	assert.Equal(t, 2, delegate.executeCalls)
@@ -243,26 +216,21 @@ func TestSubscribeEventsAllowsSameRequestIDAcrossDistinctSessions(t *testing.T)
 	defer runGateway.stop(t)
 
 	addr := waitForListenAddr(t, server)
-	conn := dialGatewayClient(t, addr)
-	defer func() {
-		require.NoError(t, conn.Close())
-	}()
+	client := newEdgeClient(t, addr)
 
-	client := gatewayv1.NewEdgeGatewayClient(conn)
-
-	stream, err := client.SubscribeEvents(context.Background(), newValidSubscribeEventsRequestWithSessionAndRequestID("device-session-123", "request-shared"))
+	stream, err := client.SubscribeEvents(context.Background(), connect.NewRequest(newValidSubscribeEventsRequestWithSessionAndRequestID("device-session-123", "request-shared")))
 	require.NoError(t, err)
 	event := recvBootstrapEvent(t, stream)
 	assertServerTimeBootstrapEvent(t, event, newTestResponseSignerPublicKey(), "request-shared", "trace-123", testCurrentTime.UnixMilli())
-	_, err = stream.Recv()
-	require.ErrorIs(t, err, io.EOF)
+	require.False(t, stream.Receive())
+	require.NoError(t, stream.Err())
 
-	stream, err = client.SubscribeEvents(context.Background(), newValidSubscribeEventsRequestWithSessionAndRequestID("device-session-456", "request-shared"))
+	stream, err = client.SubscribeEvents(context.Background(), connect.NewRequest(newValidSubscribeEventsRequestWithSessionAndRequestID("device-session-456", "request-shared")))
 	require.NoError(t, err)
 	event = recvBootstrapEvent(t, stream)
 	assertServerTimeBootstrapEvent(t, event, newTestResponseSignerPublicKey(), "request-shared", "trace-123", testCurrentTime.UnixMilli())
-	_, err = stream.Recv()
-	require.ErrorIs(t, err, io.EOF)
+	require.False(t, stream.Receive())
+	require.NoError(t, stream.Err())
 
 	assert.Equal(t, 2, delegate.subscribeCalls)
 }
@@ -283,16 +251,11 @@ func TestExecuteCommandRejectsReplayStoreUnavailable(t *testing.T) {
 	defer runGateway.stop(t)
 
 	addr := waitForListenAddr(t, server)
-	conn := dialGatewayClient(t, addr)
-	defer func() {
-		require.NoError(t, conn.Close())
-	}()
-
-	client := gatewayv1.NewEdgeGatewayClient(conn)
-	_, err := client.ExecuteCommand(context.Background(), newValidExecuteCommandRequest())
+	client := newEdgeClient(t, addr)
+	_, err := client.ExecuteCommand(context.Background(), connect.NewRequest(newValidExecuteCommandRequest()))
 	require.Error(t, err)
-	assert.Equal(t, codes.Unavailable, status.Code(err))
-	assert.Equal(t, "replay store is unavailable", status.Convert(err).Message())
+	assert.Equal(t, connect.CodeUnavailable, connect.CodeOf(err))
+	assert.Equal(t, "replay store is unavailable", connectErrorMessage(t, err))
 	assert.Zero(t, delegate.executeCalls)
 }
 
@@ -312,16 +275,11 @@ func TestSubscribeEventsRejectsReplayStoreUnavailable(t *testing.T) {
 	defer runGateway.stop(t)
 
 	addr := waitForListenAddr(t, server)
-	conn := dialGatewayClient(t, addr)
-	defer func() {
-		require.NoError(t, conn.Close())
-	}()
-
-	client := gatewayv1.NewEdgeGatewayClient(conn)
+	client := newEdgeClient(t, addr)
 	err := subscribeEventsError(t, context.Background(), client, newValidSubscribeEventsRequest())
 	require.Error(t, err)
-	assert.Equal(t, codes.Unavailable, status.Code(err))
-	assert.Equal(t, "replay store is unavailable", status.Convert(err).Message())
+	assert.Equal(t, connect.CodeUnavailable, connect.CodeOf(err))
+	assert.Equal(t, "replay store is unavailable", connectErrorMessage(t, err))
 	assert.Zero(t, delegate.subscribeCalls)
 }
 
@@ -353,15 +311,10 @@ func TestExecuteCommandFreshRequestReachesDelegateAndUsesDynamicReplayTTL(t *tes
 	defer runGateway.stop(t)
 
 	addr := waitForListenAddr(t, server)
-	conn := dialGatewayClient(t, addr)
-	defer func() {
-		require.NoError(t, conn.Close())
-	}()
-
-	client := gatewayv1.NewEdgeGatewayClient(conn)
-	response, err := client.ExecuteCommand(context.Background(), newValidExecuteCommandRequest())
+	client := newEdgeClient(t, addr)
+	response, err := client.ExecuteCommand(context.Background(), connect.NewRequest(newValidExecuteCommandRequest()))
 	require.NoError(t, err)
-	assert.Equal(t, "request-123", response.GetRequestId())
+	assert.Equal(t, "request-123", response.Msg.GetRequestId())
 	assert.Equal(t, "device-session-123", reservedDeviceSessionID)
 	assert.Equal(t, "request-123", reservedRequestID)
 	assert.Equal(t, testFreshnessWindow, reservedTTL)
@@ -394,18 +347,13 @@ func TestSubscribeEventsFreshRequestReachesDelegateAndUsesDynamicReplayTTL(t *te
 	defer runGateway.stop(t)
 
 	addr := waitForListenAddr(t, server)
-	conn := dialGatewayClient(t, addr)
-	defer func() {
-		require.NoError(t, conn.Close())
-	}()
-
-	client := gatewayv1.NewEdgeGatewayClient(conn)
-	stream, err := client.SubscribeEvents(context.Background(), newValidSubscribeEventsRequest())
+	client := newEdgeClient(t, addr)
+	stream, err := client.SubscribeEvents(context.Background(), connect.NewRequest(newValidSubscribeEventsRequest()))
 	require.NoError(t, err)
 	event := recvBootstrapEvent(t, stream)
 	assertServerTimeBootstrapEvent(t, event, newTestResponseSignerPublicKey(), "request-123", "trace-123", testCurrentTime.UnixMilli())
-	_, err = stream.Recv()
-	require.ErrorIs(t, err, io.EOF)
+	require.False(t, stream.Receive())
+	require.NoError(t, stream.Err())
 	assert.Equal(t, testFreshnessWindow, reservedTTL)
 	assert.Equal(t, 1, delegate.subscribeCalls)
 }
@@ -434,15 +382,10 @@ func TestExecuteCommandFutureSkewUsesExtendedReplayTTL(t *testing.T) {
 	defer runGateway.stop(t)
 
 	addr := waitForListenAddr(t, server)
-	conn := dialGatewayClient(t, addr)
-	defer func() {
-		require.NoError(t, conn.Close())
-	}()
-
-	client := gatewayv1.NewEdgeGatewayClient(conn)
+	client := newEdgeClient(t, addr)
 	_, err := client.ExecuteCommand(
 		context.Background(),
-		newValidExecuteCommandRequestWithTimestamp("device-session-123", "request-123", testCurrentTime.Add(2*time.Minute).UnixMilli()),
+		connect.NewRequest(newValidExecuteCommandRequestWithTimestamp("device-session-123", "request-123", testCurrentTime.Add(2*time.Minute).UnixMilli())),
 	)
 	require.NoError(t, err)
 	assert.Equal(t, 7*time.Minute, reservedTTL)
@@ -473,15 +416,10 @@ func TestExecuteCommandBoundaryFreshnessUsesMinimumReplayTTL(t *testing.T) {
 	defer runGateway.stop(t)
 
 	addr := waitForListenAddr(t, server)
-	conn := dialGatewayClient(t, addr)
-	defer func() {
-		require.NoError(t, conn.Close())
-	}()
-
-	client := gatewayv1.NewEdgeGatewayClient(conn)
+	client := newEdgeClient(t, addr)
 	_, err := client.ExecuteCommand(
 		context.Background(),
-		newValidExecuteCommandRequestWithTimestamp("device-session-123", "request-123", testCurrentTime.Add(-testFreshnessWindow).UnixMilli()),
+		connect.NewRequest(newValidExecuteCommandRequestWithTimestamp("device-session-123", "request-123", testCurrentTime.Add(-testFreshnessWindow).UnixMilli())),
 	)
 	require.NoError(t, err)
 	assert.Equal(t, minimumReplayReservationTTL, reservedTTL)

gateway/internal/grpcapi/observability.go

@@ -12,59 +12,21 @@ import (
 
 	"go.opentelemetry.io/otel/attribute"
 	"go.uber.org/zap"
-	"google.golang.org/grpc"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
 )
 
-func observabilityUnaryInterceptor(logger *zap.Logger, metrics *telemetry.Runtime) grpc.UnaryServerInterceptor {
-	if logger == nil {
-		logger = zap.NewNop()
-	}
-
-	return func(ctx context.Context, req any, info *grpc.UnaryServerInfo, handler grpc.UnaryHandler) (any, error) {
-		start := time.Now()
-		resp, err := handler(ctx, req)
-
-		recordGRPCRequest(logger, metrics, ctx, info.FullMethod, req, resp, err, time.Since(start), "unary")
-		return resp, err
-	}
-}
-
-func observabilityStreamInterceptor(logger *zap.Logger, metrics *telemetry.Runtime) grpc.StreamServerInterceptor {
-	if logger == nil {
-		logger = zap.NewNop()
-	}
-
-	return func(srv any, stream grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) error {
-		start := time.Now()
-		wrapped := &observabilityServerStream{ServerStream: stream}
-		err := handler(srv, wrapped)
-
-		recordGRPCRequest(logger, metrics, stream.Context(), info.FullMethod, wrapped.request, nil, err, time.Since(start), "stream")
-		return err
-	}
-}
-
-type observabilityServerStream struct {
-	grpc.ServerStream
-	request any
-}
-
-func (s *observabilityServerStream) RecvMsg(m any) error {
-	err := s.ServerStream.RecvMsg(m)
-	if err == nil && s.request == nil {
-		s.request = m
-	}
-
-	return err
-}
-
-func recordGRPCRequest(logger *zap.Logger, metrics *telemetry.Runtime, ctx context.Context, fullMethod string, req any, resp any, err error, duration time.Duration, streamKind string) {
+// recordEdgeRequest emits the structured log entry and the
+// `gateway.authenticated_grpc.*` metric pair for one authenticated edge
+// request or stream outcome. The transport parameter labels the wire
+// protocol the request travelled over (`connect`, `grpc`, or `grpc-web`),
+// preserving stable observability semantics across the unified Connect-go
+// listener.
+func recordEdgeRequest(logger *zap.Logger, metrics *telemetry.Runtime, ctx context.Context, transport string, fullMethod string, req any, resp any, err error, duration time.Duration, streamKind string) {
 	rpcMethod := path.Base(fullMethod)
-	messageType, requestID, traceID := grpcEnvelopeFields(req)
-	resultCode := grpcResultCode(resp)
-	grpcCode, grpcMessage, outcome := grpcOutcome(err)
+	messageType, requestID, traceID := envelopeFieldsFromRequest(req)
+	resultCode := resultCodeFromResponse(resp)
+	grpcCode, grpcMessage, outcome := outcomeFromError(err)
 	rejectReason := telemetry.RejectReason(outcome)
 
 	attrs := []attribute.KeyValue{
@@ -82,7 +44,7 @@ func recordGRPCRequest(logger *zap.Logger, metrics *telemetry.Runtime, ctx conte
 
 	fields := []zap.Field{
 		zap.String("component", "authenticated_grpc"),
-		zap.String("transport", "grpc"),
+		zap.String("transport", transport),
 		zap.String("stream_kind", streamKind),
 		zap.String("rpc_method", rpcMethod),
 		zap.String("message_type", messageType),
@@ -106,15 +68,15 @@ func recordGRPCRequest(logger *zap.Logger, metrics *telemetry.Runtime, ctx conte
 
 	switch outcome {
 	case telemetry.EdgeOutcomeSuccess:
-		logger.Info("authenticated gRPC request completed", fields...)
+		logger.Info("authenticated edge request completed", fields...)
 	case telemetry.EdgeOutcomeBackendUnavailable, telemetry.EdgeOutcomeDownstreamUnavailable, telemetry.EdgeOutcomeInternalError:
-		logger.Error("authenticated gRPC request failed", fields...)
+		logger.Error("authenticated edge request failed", fields...)
 	default:
-		logger.Warn("authenticated gRPC request rejected", fields...)
+		logger.Warn("authenticated edge request rejected", fields...)
 	}
 }
 
-func grpcEnvelopeFields(req any) (messageType string, requestID string, traceID string) {
+func envelopeFieldsFromRequest(req any) (messageType string, requestID string, traceID string) {
 	switch typed := req.(type) {
 	case *gatewayv1.ExecuteCommandRequest:
 		return typed.GetMessageType(), typed.GetRequestId(), typed.GetTraceId()
@@ -125,7 +87,7 @@ func grpcEnvelopeFields(req any) (messageType string, requestID string, traceID
 	}
 }
 
-func grpcResultCode(resp any) string {
+func resultCodeFromResponse(resp any) string {
 	typed, ok := resp.(*gatewayv1.ExecuteCommandResponse)
 	if !ok {
 		return ""
@@ -134,7 +96,7 @@ func grpcResultCode(resp any) string {
 	return typed.GetResultCode()
 }
 
-func grpcOutcome(err error) (codes.Code, string, telemetry.EdgeOutcome) {
+func outcomeFromError(err error) (codes.Code, string, telemetry.EdgeOutcome) {
 	switch {
 	case err == nil:
 		return codes.OK, "", telemetry.EdgeOutcomeSuccess

gateway/internal/grpcapi/payload_hash_integration_test.go

@@ -6,12 +6,10 @@ import (
 	"testing"
 
 	"galaxy/gateway/internal/session"
-	gatewayv1 "galaxy/gateway/proto/galaxy/gateway/v1"
 
+	"connectrpc.com/connect"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
-	"google.golang.org/grpc/codes"
-	"google.golang.org/grpc/status"
 )
 
 func TestExecuteCommandRejectsPayloadHashWithInvalidLength(t *testing.T) {
@@ -25,19 +23,15 @@ func TestExecuteCommandRejectsPayloadHashWithInvalidLength(t *testing.T) {
 	defer runGateway.stop(t)
 
 	addr := waitForListenAddr(t, server)
-	conn := dialGatewayClient(t, addr)
-	defer func() {
-		require.NoError(t, conn.Close())
-	}()
+	client := newEdgeClient(t, addr)
 
 	req := newValidExecuteCommandRequest()
 	req.PayloadHash = []byte("short")
 
-	client := gatewayv1.NewEdgeGatewayClient(conn)
-	_, err := client.ExecuteCommand(context.Background(), req)
+	_, err := client.ExecuteCommand(context.Background(), connect.NewRequest(req))
 	require.Error(t, err)
-	assert.Equal(t, codes.InvalidArgument, status.Code(err))
-	assert.Equal(t, "payload_hash must be a 32-byte SHA-256 digest", status.Convert(err).Message())
+	assert.Equal(t, connect.CodeInvalidArgument, connect.CodeOf(err))
+	assert.Equal(t, "payload_hash must be a 32-byte SHA-256 digest", connectErrorMessage(t, err))
 	assert.Zero(t, delegate.executeCalls)
 }
 
@@ -52,20 +46,16 @@ func TestExecuteCommandRejectsPayloadHashMismatch(t *testing.T) {
 	defer runGateway.stop(t)
 
 	addr := waitForListenAddr(t, server)
-	conn := dialGatewayClient(t, addr)
-	defer func() {
-		require.NoError(t, conn.Close())
-	}()
+	client := newEdgeClient(t, addr)
 
 	req := newValidExecuteCommandRequest()
 	sum := sha256.Sum256([]byte("other"))
 	req.PayloadHash = sum[:]
 
-	client := gatewayv1.NewEdgeGatewayClient(conn)
-	_, err := client.ExecuteCommand(context.Background(), req)
+	_, err := client.ExecuteCommand(context.Background(), connect.NewRequest(req))
 	require.Error(t, err)
-	assert.Equal(t, codes.InvalidArgument, status.Code(err))
-	assert.Equal(t, "payload_hash does not match payload_bytes", status.Convert(err).Message())
+	assert.Equal(t, connect.CodeInvalidArgument, connect.CodeOf(err))
+	assert.Equal(t, "payload_hash does not match payload_bytes", connectErrorMessage(t, err))
 	assert.Zero(t, delegate.executeCalls)
 }
 
@@ -80,19 +70,15 @@ func TestSubscribeEventsRejectsPayloadHashWithInvalidLength(t *testing.T) {
 	defer runGateway.stop(t)
 
 	addr := waitForListenAddr(t, server)
-	conn := dialGatewayClient(t, addr)
-	defer func() {
-		require.NoError(t, conn.Close())
-	}()
+	client := newEdgeClient(t, addr)
 
 	req := newValidSubscribeEventsRequest()
 	req.PayloadHash = []byte("short")
 
-	client := gatewayv1.NewEdgeGatewayClient(conn)
 	err := subscribeEventsError(t, context.Background(), client, req)
 	require.Error(t, err)
-	assert.Equal(t, codes.InvalidArgument, status.Code(err))
-	assert.Equal(t, "payload_hash must be a 32-byte SHA-256 digest", status.Convert(err).Message())
+	assert.Equal(t, connect.CodeInvalidArgument, connect.CodeOf(err))
+	assert.Equal(t, "payload_hash must be a 32-byte SHA-256 digest", connectErrorMessage(t, err))
 	assert.Zero(t, delegate.subscribeCalls)
 }
 
@@ -107,19 +93,15 @@ func TestSubscribeEventsRejectsPayloadHashMismatch(t *testing.T) {
 	defer runGateway.stop(t)
 
 	addr := waitForListenAddr(t, server)
-	conn := dialGatewayClient(t, addr)
-	defer func() {
-		require.NoError(t, conn.Close())
-	}()
+	client := newEdgeClient(t, addr)
 
 	req := newValidSubscribeEventsRequest()
 	sum := sha256.Sum256([]byte("other"))
 	req.PayloadHash = sum[:]
 
-	client := gatewayv1.NewEdgeGatewayClient(conn)
 	err := subscribeEventsError(t, context.Background(), client, req)
 	require.Error(t, err)
-	assert.Equal(t, codes.InvalidArgument, status.Code(err))
-	assert.Equal(t, "payload_hash does not match payload_bytes", status.Convert(err).Message())
+	assert.Equal(t, connect.CodeInvalidArgument, connect.CodeOf(err))
+	assert.Equal(t, "payload_hash does not match payload_bytes", connectErrorMessage(t, err))
 	assert.Zero(t, delegate.subscribeCalls)
 }

gateway/internal/grpcapi/rate_limit.go

@@ -3,8 +3,6 @@ package grpcapi
 import (
 	"context"
 	"errors"
-	"net"
-	"strings"
 
 	"galaxy/gateway/internal/config"
 	"galaxy/gateway/internal/ratelimit"
@@ -13,7 +11,6 @@ import (
 
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/codes"
-	"google.golang.org/grpc/peer"
 	"google.golang.org/grpc/status"
 )
 
@@ -41,7 +38,7 @@ var (
 	ErrAuthenticatedPolicyUnavailable = errors.New("authenticated request policy is unavailable")
 )
 
-// AuthenticatedRequestLimiter applies authenticated gRPC rate-limit policy to
+// AuthenticatedRequestLimiter applies authenticated edge rate-limit policy to
 // one concrete bucket key.
 type AuthenticatedRequestLimiter interface {
 	// Reserve evaluates key under policy and reports whether the request may
@@ -52,10 +49,11 @@ type AuthenticatedRequestLimiter interface {
 // AuthenticatedRequest describes the authenticated request metadata exposed to
 // the edge-policy hook.
 type AuthenticatedRequest struct {
-	// RPCMethod identifies the public gRPC method being processed.
+	// RPCMethod identifies the public RPC method being processed.
 	RPCMethod string
 
-	// PeerIP is the transport peer IP derived from the gRPC connection.
+	// PeerIP is the transport peer IP host part derived from the
+	// authenticated edge HTTP listener peer address.
 	PeerIP string
 
 	// MessageClass is the stable rate-limit and policy class. The gateway uses
@@ -258,23 +256,21 @@ func authenticatedMessageClass(messageType string) string {
 	return messageType
 }
 
+type peerIPContextKey struct{}
+
+// contextWithPeerIP attaches the authenticated edge transport peer IP to ctx.
+// It is set by the transport interceptor before the service decorator stack
+// runs, and read back via peerIPFromContext.
+func contextWithPeerIP(ctx context.Context, ip string) context.Context {
+	return context.WithValue(ctx, peerIPContextKey{}, ip)
+}
+
 func peerIPFromContext(ctx context.Context) string {
-	peerInfo, ok := peer.FromContext(ctx)
-	if !ok || peerInfo.Addr == nil {
-		return unknownAuthenticatedPeerIP
+	if ip, ok := ctx.Value(peerIPContextKey{}).(string); ok && ip != "" {
+		return ip
 	}
 
-	value := strings.TrimSpace(peerInfo.Addr.String())
-	if value == "" {
-		return unknownAuthenticatedPeerIP
-	}
-
-	host, _, err := net.SplitHostPort(value)
-	if err == nil && host != "" {
-		return host
-	}
-
-	return value
+	return unknownAuthenticatedPeerIP
 }
 
 type noopAuthenticatedRequestPolicy struct{}

gateway/internal/grpcapi/rate_limit_integration_test.go

@@ -3,7 +3,6 @@ package grpcapi
 import (
 	"context"
 	"fmt"
-	"io"
 	"net"
 	"net/http"
 	"strings"
@@ -17,10 +16,9 @@ import (
 	"galaxy/gateway/internal/session"
 	gatewayv1 "galaxy/gateway/proto/galaxy/gateway/v1"
 
+	"connectrpc.com/connect"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
-	"google.golang.org/grpc/codes"
-	"google.golang.org/grpc/status"
 )
 
 func TestExecuteCommandRateLimitsByIP(t *testing.T) {
@@ -41,20 +39,15 @@ func TestExecuteCommandRateLimitsByIP(t *testing.T) {
 	defer runGateway.stop(t)
 
 	addr := waitForListenAddr(t, server)
-	conn := dialGatewayClient(t, addr)
-	defer func() {
-		require.NoError(t, conn.Close())
-	}()
+	client := newEdgeClient(t, addr)
 
-	client := gatewayv1.NewEdgeGatewayClient(conn)
-
-	_, err := client.ExecuteCommand(context.Background(), newValidExecuteCommandRequestWithSessionAndRequestID("device-session-1", "request-1"))
+	_, err := client.ExecuteCommand(context.Background(), connect.NewRequest(newValidExecuteCommandRequestWithSessionAndRequestID("device-session-1", "request-1")))
 	require.NoError(t, err)
 
-	_, err = client.ExecuteCommand(context.Background(), newValidExecuteCommandRequestWithSessionAndRequestID("device-session-2", "request-2"))
+	_, err = client.ExecuteCommand(context.Background(), connect.NewRequest(newValidExecuteCommandRequestWithSessionAndRequestID("device-session-2", "request-2")))
 	require.Error(t, err)
-	assert.Equal(t, codes.ResourceExhausted, status.Code(err))
-	assert.Equal(t, "authenticated request rate limit exceeded", status.Convert(err).Message())
+	assert.Equal(t, connect.CodeResourceExhausted, connect.CodeOf(err))
+	assert.Equal(t, "authenticated request rate limit exceeded", connectErrorMessage(t, err))
 	assert.Equal(t, 1, delegate.executeCalls)
 }
 
@@ -76,21 +69,16 @@ func TestExecuteCommandRateLimitsBySession(t *testing.T) {
 	defer runGateway.stop(t)
 
 	addr := waitForListenAddr(t, server)
-	conn := dialGatewayClient(t, addr)
-	defer func() {
-		require.NoError(t, conn.Close())
-	}()
+	client := newEdgeClient(t, addr)
 
-	client := gatewayv1.NewEdgeGatewayClient(conn)
-
-	_, err := client.ExecuteCommand(context.Background(), newValidExecuteCommandRequestWithSessionAndRequestID("device-session-1", "request-1"))
+	_, err := client.ExecuteCommand(context.Background(), connect.NewRequest(newValidExecuteCommandRequestWithSessionAndRequestID("device-session-1", "request-1")))
 	require.NoError(t, err)
 
-	_, err = client.ExecuteCommand(context.Background(), newValidExecuteCommandRequestWithSessionAndRequestID("device-session-1", "request-2"))
+	_, err = client.ExecuteCommand(context.Background(), connect.NewRequest(newValidExecuteCommandRequestWithSessionAndRequestID("device-session-1", "request-2")))
 	require.Error(t, err)
-	assert.Equal(t, codes.ResourceExhausted, status.Code(err))
+	assert.Equal(t, connect.CodeResourceExhausted, connect.CodeOf(err))
 
-	_, err = client.ExecuteCommand(context.Background(), newValidExecuteCommandRequestWithSessionAndRequestID("device-session-2", "request-3"))
+	_, err = client.ExecuteCommand(context.Background(), connect.NewRequest(newValidExecuteCommandRequestWithSessionAndRequestID("device-session-2", "request-3")))
 	require.NoError(t, err)
 
 	assert.Equal(t, 2, delegate.executeCalls)
@@ -118,21 +106,16 @@ func TestExecuteCommandRateLimitsByUser(t *testing.T) {
 	defer runGateway.stop(t)
 
 	addr := waitForListenAddr(t, server)
-	conn := dialGatewayClient(t, addr)
-	defer func() {
-		require.NoError(t, conn.Close())
-	}()
+	client := newEdgeClient(t, addr)
 
-	client := gatewayv1.NewEdgeGatewayClient(conn)
-
-	_, err := client.ExecuteCommand(context.Background(), newValidExecuteCommandRequestWithSessionAndRequestID("device-session-1", "request-1"))
+	_, err := client.ExecuteCommand(context.Background(), connect.NewRequest(newValidExecuteCommandRequestWithSessionAndRequestID("device-session-1", "request-1")))
 	require.NoError(t, err)
 
-	_, err = client.ExecuteCommand(context.Background(), newValidExecuteCommandRequestWithSessionAndRequestID("device-session-2", "request-2"))
+	_, err = client.ExecuteCommand(context.Background(), connect.NewRequest(newValidExecuteCommandRequestWithSessionAndRequestID("device-session-2", "request-2")))
 	require.Error(t, err)
-	assert.Equal(t, codes.ResourceExhausted, status.Code(err))
+	assert.Equal(t, connect.CodeResourceExhausted, connect.CodeOf(err))
 
-	_, err = client.ExecuteCommand(context.Background(), newValidExecuteCommandRequestWithSessionAndRequestID("device-session-3", "request-3"))
+	_, err = client.ExecuteCommand(context.Background(), connect.NewRequest(newValidExecuteCommandRequestWithSessionAndRequestID("device-session-3", "request-3")))
 	require.NoError(t, err)
 
 	assert.Equal(t, 2, delegate.executeCalls)
@@ -159,21 +142,16 @@ func TestExecuteCommandRateLimitsByMessageClass(t *testing.T) {
 	defer runGateway.stop(t)
 
 	addr := waitForListenAddr(t, server)
-	conn := dialGatewayClient(t, addr)
-	defer func() {
-		require.NoError(t, conn.Close())
-	}()
+	client := newEdgeClient(t, addr)
 
-	client := gatewayv1.NewEdgeGatewayClient(conn)
-
-	_, err := client.ExecuteCommand(context.Background(), newValidExecuteCommandRequestWithMessageType("device-session-1", "request-1", "fleet.move"))
+	_, err := client.ExecuteCommand(context.Background(), connect.NewRequest(newValidExecuteCommandRequestWithMessageType("device-session-1", "request-1", "fleet.move")))
 	require.NoError(t, err)
 
-	_, err = client.ExecuteCommand(context.Background(), newValidExecuteCommandRequestWithMessageType("device-session-2", "request-2", "fleet.move"))
+	_, err = client.ExecuteCommand(context.Background(), connect.NewRequest(newValidExecuteCommandRequestWithMessageType("device-session-2", "request-2", "fleet.move")))
 	require.Error(t, err)
-	assert.Equal(t, codes.ResourceExhausted, status.Code(err))
+	assert.Equal(t, connect.CodeResourceExhausted, connect.CodeOf(err))
 
-	_, err = client.ExecuteCommand(context.Background(), newValidExecuteCommandRequestWithMessageType("device-session-2", "request-3", "fleet.rename"))
+	_, err = client.ExecuteCommand(context.Background(), connect.NewRequest(newValidExecuteCommandRequestWithMessageType("device-session-2", "request-3", "fleet.rename")))
 	require.NoError(t, err)
 
 	assert.Equal(t, 2, delegate.executeCalls)
@@ -193,13 +171,8 @@ func TestAuthenticatedPolicyHookReceivesVerifiedRequest(t *testing.T) {
 	defer runGateway.stop(t)
 
 	addr := waitForListenAddr(t, server)
-	conn := dialGatewayClient(t, addr)
-	defer func() {
-		require.NoError(t, conn.Close())
-	}()
-
-	client := gatewayv1.NewEdgeGatewayClient(conn)
-	_, err := client.ExecuteCommand(context.Background(), newValidExecuteCommandRequest())
+	client := newEdgeClient(t, addr)
+	_, err := client.ExecuteCommand(context.Background(), connect.NewRequest(newValidExecuteCommandRequest()))
 	require.NoError(t, err)
 
 	require.Len(t, policy.requests, 1)
@@ -228,16 +201,11 @@ func TestExecuteCommandPolicyRejectMapsToPermissionDenied(t *testing.T) {
 	defer runGateway.stop(t)
 
 	addr := waitForListenAddr(t, server)
-	conn := dialGatewayClient(t, addr)
-	defer func() {
-		require.NoError(t, conn.Close())
-	}()
-
-	client := gatewayv1.NewEdgeGatewayClient(conn)
-	_, err := client.ExecuteCommand(context.Background(), newValidExecuteCommandRequest())
+	client := newEdgeClient(t, addr)
+	_, err := client.ExecuteCommand(context.Background(), connect.NewRequest(newValidExecuteCommandRequest()))
 	require.Error(t, err)
-	assert.Equal(t, codes.PermissionDenied, status.Code(err))
-	assert.Equal(t, "authenticated request rejected by edge policy", status.Convert(err).Message())
+	assert.Equal(t, connect.CodePermissionDenied, connect.CodeOf(err))
+	assert.Equal(t, "authenticated request rejected by edge policy", connectErrorMessage(t, err))
 	assert.Zero(t, delegate.executeCalls)
 }
 
@@ -259,24 +227,19 @@ func TestSubscribeEventsRateLimitRejectsStream(t *testing.T) {
 	defer runGateway.stop(t)
 
 	addr := waitForListenAddr(t, server)
-	conn := dialGatewayClient(t, addr)
-	defer func() {
-		require.NoError(t, conn.Close())
-	}()
+	client := newEdgeClient(t, addr)
 
-	client := gatewayv1.NewEdgeGatewayClient(conn)
-
-	stream, err := client.SubscribeEvents(context.Background(), newValidSubscribeEventsRequestWithSessionAndRequestID("device-session-1", "request-1"))
+	stream, err := client.SubscribeEvents(context.Background(), connect.NewRequest(newValidSubscribeEventsRequestWithSessionAndRequestID("device-session-1", "request-1")))
 	require.NoError(t, err)
 	event := recvBootstrapEvent(t, stream)
 	assertServerTimeBootstrapEvent(t, event, newTestResponseSignerPublicKey(), "request-1", "trace-123", testCurrentTime.UnixMilli())
-	_, err = stream.Recv()
-	require.ErrorIs(t, err, io.EOF)
+	require.False(t, stream.Receive())
+	require.NoError(t, stream.Err())
 
 	err = subscribeEventsError(t, context.Background(), client, newValidSubscribeEventsRequestWithSessionAndRequestID("device-session-2", "request-2"))
 	require.Error(t, err)
-	assert.Equal(t, codes.ResourceExhausted, status.Code(err))
-	assert.Equal(t, "authenticated request rate limit exceeded", status.Convert(err).Message())
+	assert.Equal(t, connect.CodeResourceExhausted, connect.CodeOf(err))
+	assert.Equal(t, "authenticated request rate limit exceeded", connectErrorMessage(t, err))
 	assert.Equal(t, 1, delegate.subscribeCalls)
 }
 
@@ -342,13 +305,8 @@ func TestAuthenticatedRateLimitsStayIsolatedFromPublicREST(t *testing.T) {
 	require.NoError(t, firstPublic.Body.Close())
 	require.NoError(t, secondPublic.Body.Close())
 
-	conn := dialGatewayClient(t, addr)
-	defer func() {
-		require.NoError(t, conn.Close())
-	}()
-
-	client := gatewayv1.NewEdgeGatewayClient(conn)
-	_, err := client.ExecuteCommand(context.Background(), newValidExecuteCommandRequest())
+	client := newEdgeClient(t, addr)
+	_, err := client.ExecuteCommand(context.Background(), connect.NewRequest(newValidExecuteCommandRequest()))
 	require.NoError(t, err)
 }