Merge pull request 'chore(release): promote development to master' (#258) from development into master

Telegram non-disableably auto-pins each channel post it auto-forwards
into the linked discussion group. The bot now detects that message by
Message.is_automatic_forward in the moderated chat (TELEGRAM_CHAT_ID)
and unpins it by id, so a pin set by a human admin — or by the bot for
another message — is never touched (no unpinAllChatMessages).

Needs the can_pin_messages right in the chat; the startup self-check
now also warns when it is missing. Bot-only; no wire/schema/DB change.

.claude/CLAUDE.md

@@ -0,0 +1,242 @@
+# Agent field notes — scrabble-game
+
+Non-obvious, hard-won project knowledge that is **not** in the main docs (`CLAUDE.md`, `docs/*`,
+`deploy/README.md`). Kept in the repo so it travels with a clone to any host. These are working
+memory, not a spec — **verify any named file / flag / function against the current code before acting
+on it**, and prefer the authoritative docs where they overlap. Add to this file as new gotchas turn up.
+
+## Codegen & build
+
+- **jetgen churns everything.** `backend/cmd/jetgen` regenerates go-jet code for *all* tables and may
+  reorder output. After running it, revert the churn on tables you did not touch and commit only your
+  table's change.
+- **flatc is version-pinned** (`pkg/Makefile`, `REQUIRED_FLATC = 23.5.26`, hard-checked). A different
+  flatc silently churns the generated wire code and can flip wire defaults. Never regenerate FBS with
+  another flatc version.
+- **gopls lags codegen.** Right after an FBS/jet regen, gopls shows phantom "undefined" errors. Trust
+  `go build` / `go test`, not the editor squiggles.
+- **go-jet type mapping:** SQL `numeric` → `float64`, `interval` → `string`. Never store money as
+  `numeric` (float precision loss) — use **bigint minor units + a `Money` type**; store durations as
+  **int seconds**, not `interval`.
+- **`go mod tidy` chokes on dot-free local module paths** (`scrabble/...`). Hand-edit `go.mod` when a
+  bump is needed. The solver (`../scrabble-solver`) is consumed via `go.work` replace locally, but a
+  prod bump goes through a solver **PR → master + a published tag**, not a local replace.
+- **Run the whole CI suite locally before pushing** — unit + integration (`//go:build integration`,
+  Postgres) + the UI job + codegen check. Do not lean on CI to catch what a local run would.
+- **CI runner shares this host's `/tmp` as a different user.** In workflow steps, write artifacts to
+  `${GITHUB_WORKSPACE}`, never a fixed `/tmp/...` path (cross-user permission failures otherwise).
+- **pnpm corepack pre-flight flakes.** `pnpm exec` / `pnpm check` occasionally abort on a corepack
+  pre-flight. Dodge it by invoking the tool directly: `node_modules/.bin/<tool>`.
+
+## Native Android build (Capacitor)
+
+The native Android app is a Capacitor 8 wrapper of the `ui` SPA, scaffolded under
+`ui/` (a Node project outside `go.work`). Hard-won bring-up facts — verify against current code:
+
+- **Capacitor 8 needs JDK 21, not 17.** `@capacitor/android` compiles at `VERSION_21`; a JDK 17 Gradle
+  run dies with `error: invalid source release: 21`. Install sudo-free via the Homebrew **formula**
+  `brew install openjdk@21` (the `temurin@21` **cask** wants sudo for a system `.pkg`, unusable
+  non-interactively) + a user symlink into `~/Library/Java/JavaVirtualMachines/` so
+  `/usr/libexec/java_home -v 21` finds it. JDK 17 stays fine for `sdkmanager`/`avdmanager`.
+- **Cap 8 SDK pins:** compileSdk/targetSdk **36**, minSdk **24**, Gradle **8.14.3**, AGP **8.13.0**
+  (`ui/android/variables.gradle`). Install `platforms;android-36` — Android Studio's newer
+  `android-36.1` does NOT satisfy compileSdk 36.
+- **SDK is Android Studio's** at `~/Library/Android/sdk` (no `cmdline-tools` by default → `brew install
+  --cask android-commandlinetools`, then `sdkmanager`/`avdmanager --sdk_root=$HOME/Library/Android/sdk`).
+  Gradle finds it via **`ANDROID_HOME`** (`local.properties` is gitignored, machine-specific).
+- **Build recipe:** `cd ui && pnpm build && node_modules/.bin/cap sync android`; then `cd ui/android &&
+  ANDROID_HOME=~/Library/Android/sdk JAVA_HOME=$(/usr/libexec/java_home -v 21) ./gradlew assembleDebug`
+  → `ui/android/app/build/outputs/apk/debug/app-debug.apk`. Prefer the local `ui/node_modules/.bin/cap`
+  (dodges the corepack flake).
+- **Emulator smoke:** existing AVDs `Pixel_10` / `Pixel_4_Android_10_API_29` / `Pixel_Android_9`;
+  `emulator -avd <name>`, `adb install -r <apk>`, `adb shell monkey -p ru.eruditgame.app -c
+  android.intent.category.LAUNCHER 1`, `adb exec-out screencap -p > x.png`. The boot wait needs `sleep`
+  → run it as a **background** Bash task (foreground `sleep` is blocked). Browsers/WebView are cached, so a
+  full offline vs_ai turn is drivable via `adb shell input tap` (tap through the first-run coachmark tour —
+  each tap advances one step — then Hint places a suggested word; commit → the robot replies).
+- **Android 15+ edge-to-edge safe-area (WebView-version-dependent, bit me on API 37).** targetSdk 36 forces
+  edge-to-edge — the WebView draws behind the status bar (top) and the gesture-nav home indicator (bottom).
+  On Android **WebView < 140**, `env(safe-area-inset-*)` wrongly reports **0**, so chrome relying on it draws
+  under the bars and is untappable: the top nav under the clock, and the game's bottom action bar's **centre**
+  button (Hint) under the home-indicator pill (side buttons still work; `navigation_mode`=2 is gesture nav).
+  Fix is CSS-only, in TWO parts: (1) Capacitor 8's **SystemBars** plugin (built into `@capacitor/core`,
+  `insetsHandling:'css'` default — no dep, no config) injects correct `--safe-area-inset-*`; consume them as
+  `--tg-safe-*: var(--safe-area-inset-*, env(safe-area-inset-*, 0px))` (`ui/src/app.css`) — fixes any consumer
+  that ALREADY applies the token (the bottom bars: `Game.svelte`/`Screen.svelte` `--tg-safe-bottom`).
+  (2) But a consumer that never applied the top inset on the native path is NOT fixed by the token alone — the
+  **header's** top inset was Telegram-fullscreen-scoped only, so the native header sat under the status bar on
+  EVERY WebView; it needed its own `.bar { padding-top: calc(var(--safe-area-inset-top, 0px) + 5px) }`
+  (`Header.svelte`, native-only via the plugin var; tg-fullscreen still overrides via specificity). **Measure
+  per element, don't eyeball** — a centred title at y=11 under a 54px bar reads as "fine" in a screenshot but
+  is overlapping; an emulator WebView auto-updated to ≥140 (Chrome 149) also hides the `env()`=0 half (so the
+  BOTTOM looks fine there while the user's < 140 device overlaps). **Inspect a live debug WebView** over CDP:
+  `adb forward tcp:9222 localabstract:$(adb shell cat /proc/net/unix | grep -o 'webview_devtools_remote_[0-9]*'
+  | head -1)`, then Playwright `chromium.connectOverCDP('http://localhost:9222')` → `page.evaluate` (read each
+  element's `getBoundingClientRect().top`, and `--safe-area-inset-*` vs `env(...)`).
+- **`sharp` is whitelisted** in `ui/pnpm-workspace.yaml` (`allowBuilds: sharp: true`) — `@capacitor/assets`
+  uses it for `pnpm android:assets` (launcher icon/splash); else pnpm 11 raises `ERR_PNPM_IGNORED_BUILDS`.
+- **Bundled offline dicts come from the `scrabble-dictionary` release** (`scrabble-dawg-<DICT_VERSION>.tar.gz`,
+  keyed on the `DICT_VERSION` Gitea var — the same source the backend image + CI `curl`), NOT
+  `scrabble-solver/dawg` (those are the solver's pinned test fixtures).
+
+## Wire / schema evolution (client ↔ gateway ↔ backend)
+
+- **FBS is additive-only.** Add **trailing** fields ("added trailing — backward-compatible"). Never
+  delete or reorder a mid-table field — **deprecate** it (`(deprecated)`); deleting shifts field IDs
+  and breaks older readers.
+- **Retiring a domain field must also retire the WIRE field it fed** — by deprecation, not deletion,
+  and do not just zero it: a dead `0` the client dutifully syncs will clobber the real value.
+- **The gateway transcodes FBS ↔ backend JSON DTOs in lockstep.** A wire change usually means editing
+  both the FBS schema and the backend DTO.
+- **Seat display name is built in two places** — `game.Service` live events **and** the server REST
+  DTOs. Change both or they drift.
+- **A per-viewer flag is computed only in the per-viewer REST DTO**; the client seeds it from REST,
+  then bumps it from the live event. Don't expect it on the shared broadcast.
+
+## UI / Svelte 5
+
+- **Never name a `$state` variable `state`.** `svelte-check` then misreads `$state` as a store
+  subscription. Rename (e.g. `view`).
+- **Svelte trims literal edge whitespace** in markup. To keep a separator space, emit an expression:
+  `{' : '}`.
+- **No global `.btn` / `.ghost` button classes.** Style buttons per-component with scoped CSS + design
+  tokens (mirror `NewGame`'s `.invite`).
+- **A `$state` proxy fails structured-clone** when persisted to IndexedDB. Snapshot at the call site
+  with `$state.snapshot(...)` before storing.
+
+## Platform / WebView quirks (Telegram, VK, iOS, native, old Android)
+
+- **Telegram `showPopup` eats the user-activation.** Share / clipboard called from inside a
+  `showPopup` callback fail (no gesture). Use your own `Modal` for gesture-gated Web APIs.
+- **iOS Telegram `<a download blob:>` navigates away** and strands the SPA. Deliver files by **Web
+  Share on mobile**, and only use a `<a download>` Blob path on **desktop**.
+- **Android TG/VK WebViews** lack `navigator.share` and ignore `<a download>`. Deliver a
+  client-generated file by **copying it to the clipboard**.
+- **VK Android WebView ignores `target=_blank`.** Open external links through `lib/links.ts`
+  (routes to `vk.com/away.php`). Verify on-device.
+- **Per-platform file-delivery last hop differs** (TG / VK / plain browser) — there is a delivery
+  matrix; do not re-litigate it without new on-device facts.
+- **Old Android System WebView floor ≈ Chrome 67.** The bundle targets **es2019** (esbuild lowers
+  syntax), a conditional `core-js` polyfill loads only on old engines, and `index.html` has a boot
+  gate (BigInt / Proxy are the hard block → the unsupported-engine screen). There's also a `vmin`
+  glyph fallback for old rendering.
+- **iOS WKWebView overscroll and Telegram swipe-to-close are not reproducible in Playwright.** Verify
+  those live on the deployed contour, not in the e2e.
+- **Telegram Desktop Mini App shows a persistent bottom-right loader** — that's the long-lived
+  Subscribe stream, cosmetic, deliberately left as-is.
+
+## Testing
+
+- **UI test layers:** vitest (node env, pure logic, **no jsdom**) + Playwright **mock** e2e. The mock
+  e2e **bypasses the codec**, so wire/codec bugs need **codec unit tests**, not e2e coverage.
+- **Mock overlay blocks e2e.** The cold-load overlay must be instant under the mock build or it
+  intercepts Playwright taps.
+- **Mock tile pools lack a blank `'?'`.** The seeded game `G1` hard-codes one; flip `G1`'s variant to
+  eyeball per-variant tiles.
+- **Durable Playwright MCP servers** (chromium + webkit) exist for UI inspection (there's a
+  plugin-config gotcha in wiring them).
+- **The `playwright test` runner can't *fetch* browsers in this sandbox** — `playwright install` dies
+  with `EBADF` against the Playwright CDN (blocked network), even with the sandbox off. Run the e2e in
+  **CI** (the `ui` job installs chromium+webkit), or drive a state live through the **Playwright MCP**
+  browser against a local `vite --mode mock` server for visual verification. **But if chromium/webkit are
+  already cached** in `~/Library/Caches/ms-playwright/`, `playwright test` runs locally fine (only the CDN
+  fetch is blocked) — the native offline-first e2e was run green locally this way (chromium + webkit),
+  its dawgs from the sibling `../../scrabble-solver/dawg` via the webServer's `bundle-dicts.mjs` fallback.
+- **A native (Capacitor) e2e must inject `window.androidBridge`, NOT `window.Capacitor.getPlatform`.**
+  `@capacitor/core` (pulled in during boot by `initNativeShell`'s dynamic `@capacitor/app` import)
+  **replaces** any pre-set `window.Capacitor` with its own shim and derives the platform from
+  `window.androidBridge` (android) / `window.webkit.messageHandlers` (ios) — so a bare injected
+  `Capacitor.getPlatform: () => 'android'` is clobbered to `web` and the boot falls to `/login`. Inject
+  `window.androidBridge = { postMessage(){} }` in an `addInitScript` (see `e2e/native.spec.ts` `simulateNative`);
+  `initNativeShell` is written to tolerate the stub bridge (`try/catch` round the `@capacitor/app` addListener).
+- **`docker run -p ...` boot tests fail from the shell** (published ports unreachable in this env).
+  Use **testcontainers** for container-backed tests.
+- **Distroless images run as UID 65532 (nonroot).** Bind-mounted TLS keys must be **0644** (not 0600)
+  or the service crash-loops on start.
+
+## Deploy / test contour (operational)
+
+- **The TEST contour runs on THIS dev host.** Inspect it via `docker` / Prometheus. A host-side
+  `curl` to caddy **hangs** (NAT hairpin) — don't debug the edge that way.
+- **The contour's client IP is the home-router SNAT address**, not the real external IP. Correct in
+  prod, not a bug — which is why the IP ban / blocklist are **prod-only**.
+- **The contour is one shared env, last-deploy-wins.** Keep a multi-PR batch a **linear stack** (one
+  PR, one deploy) so deploys don't clobber each other.
+- **A schema/wire PR breaks the contour** until a `DROP SCHEMA` + backend restart. Note such a
+  prerelease step in `PRERELEASE.md`.
+- **A contour DB wipe resets the account but not the client's stored locale**; the reconciler then
+  syncs the stale locale, masking a fresh TG `language_code` seed. Clear client prefs too when testing
+  locale.
+- **`DNS=` in `TEST_AWG_CONF` pins the VPN netns to 1.1.1.1** → internal names go NXDOMAIN → the
+  bot-link silently dies. Diagnose from inside the netns.
+- **Swap one contour service to a local image** without deploy secrets via a busybox-in-the-netns
+  socket-inspect trick (single-service recreate).
+- **A rolling deploy did NOT recreate caddy on a config-only change.** Force `--force-recreate` for
+  caddy; don't trust "deploy green" for an edge-config change.
+- **A new gateway edge route MUST be added to the Caddyfile `@gateway` matcher** or it falls through
+  to the landing catch-all. Add a CI probe for the route.
+- **Prod caddy logs warnings only, no access log.** Trace a request via the backend "http request"
+  telemetry log or Tempo, not caddy.
+- **Confirm a release is live without SSH** by grepping the served SPA: `__APP_VERSION__` inside
+  `/assets/main-*.js`.
+- **"App hangs on load" was a dead HTTP/3 advert:** caddy sent `Alt-Svc: h3` with no UDP/443 open;
+  clients cache it ~30 days. Fix with `Alt-Svc: clear`.
+- **Config-poison deploy loop:** a crash-looping config-mounted service + a missing bind source
+  produces a root-owned directory that then fails deploys. Break it by removing the root-owned dir.
+- **Maintenance-window contract** (planned-deploy 503): a marker header, `/_gm` exempt, the flag spans
+  the whole roll, the SPA overlay reloads on recovery. Don't break these invariants.
+- **A new dictionary goes live via a `/_gm/dictionary` upload, NOT a redeploy.** In-flight games keep
+  their pinned version. The **owner** does the upload.
+- **Renderer deploy job flakes** on the skia-canvas GitHub binary download when its lockfile changes —
+  re-run, it's not your code.
+
+## Repo workflow
+
+- **PR-based, zero issues.** Work is tracked via PRs + `PRERELEASE.md`. "заведи задачу" means *do it*
+  / add a plan line — not file a tracker issue.
+- **`tea` CLI for all Gitea ops** (PRs, secrets, variables, dispatch). `gh` does **not** work here. The
+  agent **cannot self-approve** a PR but **can merge** it after the owner approves. Watch the
+  stale-mergeable trap (re-check mergeability right before merging).
+- **Watch every push/merge/deploy to green** with `python3 ~/.claude/bin/gitea-ci-watch.py`, launched
+  **bare** under a background task. It polls run-level conclusions; its `ALL GREEN` already covers the
+  gated deploy job. Pass `--no-runs 600` when the runner is busy. A **merge** is the most-forgotten
+  case — watch the post-merge runs too.
+- **After a merge, switch to the merged-into branch** (`development`/`master`), pull, and prune the
+  local feature branch.
+- **The contour deploy probe checks the backend `/readyz`**; a PR deploy builds the PR's own code; a
+  wedged contour can be recovered by recreating the host container set.
+
+## Domain semantics (not obvious from the code)
+
+- **Account deletion must NOT delete any user messages** — including feedback / support. Interview the
+  owner on every deletion point before wiring it.
+- **`account.time_zone` is `NOT NULL DEFAULT 'UTC'`, seeded from a detected ±HH:MM offset.** An email
+  account row is created at the **code-request** step, not at confirmation.
+- **The robot has two distinct time windows:** a **sleep window** (~00:00–07:00, gates its moves and
+  nudges) vs the **player away window** (turn-timeout only). "окно отсутствия" in dialogue = the
+  **sleep** window.
+
+## Production topology
+
+- **Two prod hosts.** `main` — full stack + ACME/edge (Selectel); `tg` — Telegram bot only (vdsina).
+  SSH aliases `scrabble-main-ops` / `scrabble-tg-ops`. Deploy is **manual dispatch only**, rolling +
+  health-gated + auto-rollback. Hosts are provisioned by `deploy/ansible/` (inventory + vars there —
+  the source of truth for IPs/roles).
+- **The agent has targeted root SSH** to the hosts (and may run the prod Ansible). Surface every
+  owner-side step **before** a deploy, not after.
+
+## Feature-area pointers (state lives in the linked docs/plans, not here)
+
+- **Monetization** — «Фишка» currency, per-platform wallets, ads. Agreements in
+  `docs/PAYMENTS_DECISIONS_ru.md`; a phased plan (E0–E9). go-jet money rule above applies.
+- **PITR** — pgBackRest → Selectel S3 (encrypted, 30-day), currently **gated off**; runbook in
+  `deploy/README.md`. Gotcha: run pgBackRest via docker-exec **as the `postgres` user** with
+  `--pg1-user=scrabble`.
+- **Offline mode** — the robot brain, move generator/validator/scorer and DAWG reader are **JS ports**
+  of the Go engine, bundled client-side and **parity-pinned** by golden tests. Multi-phase; native
+  offline-first bundles the dictionaries.
+- **VK ID web login** — raw OAuth 2.1 against `id.vk.com`, a **separate VK "Web" app** from the Mini
+  App, server-side confidential code exchange.
+- **Email relay** — Selectel SMTP + confirm / link / unlink / deletion codes + alerts.
+- **Native Android** — Capacitor bundle model, client-version gate, offline-first, RuStore; the
+  design lives in `docs/ARCHITECTURE.md` (§2 gate, §3 identity, §13 native build).

.gitea/workflows/android-build.yaml

@@ -0,0 +1,172 @@
+# Manual signed-APK build for the standalone Android app (RuStore). Runs ONLY from master, ONLY on
+# workflow_dispatch with confirm=build — the same deliberate-manual shape as prod-deploy.yaml, never on
+# a PR. It builds the native-flavoured SPA, bundles the offline dictionaries into the APK assets, and
+# assembles a release APK, uploaded as a run artifact (RuStore upload stays manual for the MVP).
+#
+# Signing degrades gracefully: with the ANDROID_KEYSTORE_* secrets present the APK is signed; without
+# them build.gradle produces an UNSIGNED release APK (so a dry run still proves the whole pipeline).
+# The keystore is a publication prerequisite — see deploy/README.md (Android build/release runbook).
+# The toolchain is self-provisioned here (JDK 21 + a cached Android SDK), so the runner host needs
+# nothing pre-installed.
+name: android-build
+run-name: "android build ${{ github.sha }}"
+
+on:
+  workflow_dispatch:
+    inputs:
+      confirm:
+        description: 'Type "build" to confirm an APK build from master.'
+        required: true
+        default: ""
+
+permissions:
+  contents: read
+
+env:
+  NO_COLOR: "1"
+  # The dictionary release, one source of truth (same Gitea variable the backend image + CI use). It
+  # both fetches the DAWGs and labels the bundled files (VITE_DICT_VERSION must equal __DICT_VERSION__).
+  DICT_VERSION: ${{ vars.DICT_VERSION }}
+  VITE_DICT_VERSION: ${{ vars.DICT_VERSION }}
+  # Hide in-app purchases in the RuStore MVP (RuStore, not Google Play — VITE_GP_BUILD stays unset).
+  VITE_PAYMENTS_DISABLED: "1"
+  # The update overlay's store target; empty until publication (the button no-ops, and the version gate
+  # is dormant in the MVP so it never fires). Set the ANDROID_RUSTORE_URL variable when the app is live.
+  VITE_RUSTORE_URL: ${{ vars.ANDROID_RUSTORE_URL }}
+  # Host-executor runner: the Android SDK is pre-installed on the host. Override ANDROID_SDK_DIR if it
+  # lives elsewhere (the default matches deploy/README.md's install path).
+  ANDROID_HOME: ${{ vars.ANDROID_SDK_DIR || '/opt/android-sdk' }}
+  ANDROID_SDK_ROOT: ${{ vars.ANDROID_SDK_DIR || '/opt/android-sdk' }}
+
+jobs:
+  build:
+    if: ${{ github.ref == 'refs/heads/master' && inputs.confirm == 'build' }}
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        shell: bash
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      # Host-executor runner: the Android SDK is pre-installed on the host (JDK 21 comes from setup-java
+      # below). Fail fast + legibly if the runner user cannot read/execute it or a needed package is
+      # missing — this doubles as the runner-access check (deploy/README.md).
+      - name: Verify the host Android SDK
+        run: |
+          sm="$ANDROID_HOME/cmdline-tools/latest/bin/sdkmanager"
+          if [ ! -x "$sm" ]; then
+            echo "::error::sdkmanager not found/executable at $sm — set the ANDROID_SDK_DIR variable if the SDK lives elsewhere, or grant the runner user read+exec: sudo chmod -R a+rX \"$ANDROID_HOME\""; exit 1
+          fi
+          for pkg in "platforms/android-36" "build-tools"; do
+            if [ ! -d "$ANDROID_HOME/$pkg" ]; then
+              echo "::error::missing $ANDROID_HOME/$pkg — run: \"$sm\" 'platforms;android-36' 'build-tools;36.0.0'"; exit 1
+            fi
+          done
+          echo "Android SDK OK at $ANDROID_HOME"; "$sm" --version
+
+      - name: Compute version + native build env
+        id: prep
+        env:
+          PUBLIC_BASE_URL: ${{ vars.PROD_PUBLIC_BASE_URL }}
+        run: |
+          # A store release must sit on an exact vMAJOR.MINOR.PATCH tag (G tags before dispatch) so the
+          # versionCode is deterministic and strictly increasing across uploads. Refuse anything else
+          # rather than derive a versionCode from a "-N-gSHA" describe.
+          desc="$(git describe --tags --exact-match 2>/dev/null || true)"
+          case "$desc" in
+            v[0-9]*.[0-9]*.[0-9]*) ;;
+            *) echo "::error::HEAD is not on a clean vX.Y.Z tag (git describe --exact-match = '${desc:-none}'); tag the release first"; exit 1 ;;
+          esac
+          v="${desc#v}"
+          IFS=. read -r MA MI PA <<< "$v"
+          # 10# forces base-10 so a zero-padded part is never read as octal.
+          code=$(( 10#$MA * 1000000 + 10#$MI * 1000 + 10#$PA ))
+          # The native SPA talks to the production origin (reuse the prod public base URL); strip any
+          # trailing slash so the Connect endpoint never doubles it.
+          gateway="${PUBLIC_BASE_URL%/}"
+          {
+            echo "tag=$desc"
+            echo "name=$v"
+            echo "code=$code"
+            echo "gateway=$gateway"
+          } >> "$GITHUB_OUTPUT"
+          echo "release $desc -> versionName $v versionCode $code, gateway $gateway"
+
+      # Same release + fetch as the Go/UI jobs in ci.yaml — the bundled dicts come from this tarball,
+      # NOT the scrabble-solver sibling (ui is a Node project outside go.work).
+      - name: Fetch dictionary DAWGs
+        run: |
+          mkdir -p "${GITHUB_WORKSPACE}/dawg"
+          curl -fsSL -o /tmp/dawg.tar.gz "https://gitea.iliadenisov.ru/developer/scrabble-dictionary/releases/download/${DICT_VERSION}/scrabble-dawg-${DICT_VERSION}.tar.gz"
+          tar xzf /tmp/dawg.tar.gz -C "${GITHUB_WORKSPACE}/dawg"
+          ls -la "${GITHUB_WORKSPACE}/dawg"
+
+      - name: Set up Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+
+      - name: Install pnpm
+        run: npm install -g pnpm@11.0.9
+
+      - name: Install deps
+        working-directory: ui
+        run: pnpm install --frozen-lockfile
+
+      - name: Build the SPA (native flavour)
+        working-directory: ui
+        env:
+          VITE_GATEWAY_URL: ${{ steps.prep.outputs.gateway }}
+          VITE_APP_VERSION: ${{ steps.prep.outputs.tag }}
+        run: pnpm run build
+
+      # Copy the release DAWGs into dist/dict/<variant>@<version>.dawg for the offline-first bundled tier
+      # (after the build, before cap sync copies dist/ into the native assets).
+      - name: Bundle the dictionaries
+        working-directory: ui
+        env:
+          DICT_DIR: ${{ github.workspace }}/dawg
+        run: node scripts/bundle-dicts.mjs
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: "21"
+
+      # Local cap binary (dodges the corepack pre-flight flake); syncs dist/ (incl. dict/) + native deps.
+      - name: Sync the native project
+        working-directory: ui
+        run: node_modules/.bin/cap sync android
+
+      - name: Decode the release keystore
+        id: keystore
+        env:
+          ANDROID_KEYSTORE_BASE64: ${{ secrets.ANDROID_KEYSTORE_BASE64 }}
+        run: |
+          if [ -n "$ANDROID_KEYSTORE_BASE64" ]; then
+            printf '%s' "$ANDROID_KEYSTORE_BASE64" | base64 -d > "${GITHUB_WORKSPACE}/release.jks"
+            echo "file=${GITHUB_WORKSPACE}/release.jks" >> "$GITHUB_OUTPUT"
+            echo "keystore decoded -> signed release build"
+          else
+            echo "file=" >> "$GITHUB_OUTPUT"
+            echo "::warning::ANDROID_KEYSTORE_BASE64 is not set — building an UNSIGNED release APK (not installable/publishable)"
+          fi
+
+      - name: Assemble the release APK
+        working-directory: ui/android
+        env:
+          ANDROID_KEYSTORE_FILE: ${{ steps.keystore.outputs.file }}
+          ANDROID_KEYSTORE_PASSWORD: ${{ secrets.ANDROID_KEYSTORE_PASSWORD }}
+          ANDROID_KEY_ALIAS: ${{ secrets.ANDROID_KEY_ALIAS }}
+          ANDROID_KEY_PASSWORD: ${{ secrets.ANDROID_KEY_PASSWORD }}
+        run: ./gradlew assembleRelease -PversionCode=${{ steps.prep.outputs.code }} -PversionName=${{ steps.prep.outputs.name }} --console=plain
+
+      - name: Upload the APK artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: erudit-${{ steps.prep.outputs.name }}-apk
+          path: ui/android/app/build/outputs/apk/release/*.apk
+          if-no-files-found: error

.gitea/workflows/ci.yaml

@@ -353,6 +353,11 @@ jobs:
           # for the server-side confidential code exchange — a SEPARATE VK app from the Mini
           # App above. One VK ID "Web" app serves every contour -> unprefixed secret.
           GATEWAY_VK_ID_CLIENT_SECRET: ${{ secrets.GATEWAY_VK_ID_CLIENT_SECRET }}
+          # Client-version gate (ARCHITECTURE.md §2): one plain (unprefixed) variable serves every
+          # contour. In the test contour the stamped client version is a commit hash (unparseable ⇒
+          # fail-open), so setting these only enforces on real semver prod builds. Empty ⇒ dormant.
+          GATEWAY_MIN_CLIENT_VERSION: ${{ vars.GATEWAY_MIN_CLIENT_VERSION }}
+          GATEWAY_RECOMMENDED_CLIENT_VERSION: ${{ vars.GATEWAY_RECOMMENDED_CLIENT_VERSION }}
           # Planted honeytoken bearer: presenting it flags the caller (logs + a ban metric on
           # test where the IP ban is off; a 24h IP ban on prod). Per-contour secret; empty = trap off.
           GATEWAY_HONEYTOKEN: ${{ secrets.TEST_GATEWAY_HONEYTOKEN }}
@@ -517,10 +522,21 @@ jobs:
           # (the seller INN, §11) AND that the pricing marker was substituted (proves the fetch +
           # splice ran), never just the status. Data-independent: an empty catalog still substitutes
           # the marker with nothing, so "pricing_template" must be absent either way.
-          out="$(docker run --rm --network edge alpine:3.20 wget -q -O - http://scrabble/offer/ 2>&1 || true)"
+          # Full body is needed (the INN is in §11 and the marker check spans the page), so this
+          # cannot be a head-only probe like the legal one. Retry with a timeout instead: the offer is
+          # now bilingual (RU + EN, larger), and a single-shot fetch can race the renderer's restart in
+          # the same deploy.
+          ok=
+          for i in $(seq 1 20); do
+            out="$(docker run --rm --network edge alpine:3.20 wget -q -T 10 -O - http://scrabble/offer/ 2>&1 || true)"
             if echo "$out" | grep -q "290210610742" && ! echo "$out" | grep -q "pricing_template"; then
               echo "ok: /offer/ serves the rendered offer with the price list spliced in"
-          else
+              ok=1
+              break
+            fi
+            sleep 3
+          done
+          if [ -z "$ok" ]; then
             echo "FAIL: /offer/ did not serve the rendered offer (route fell through, or the price splice failed)"
             docker logs --tail 50 scrabble-renderer || true
             docker logs --tail 50 scrabble-backend || true
@@ -528,6 +544,35 @@ jobs:
             exit 1
           fi
 
+      - name: Probe the /privacy/ and /eula/ legal pages are served
+        run: |
+          set -u
+          # /privacy/ and /eula/ are static legal markdown rendered by the render sidecar. If the
+          # @legal caddy route is missing they fall to the landing shell (also 200, canonical
+          # erudit-game.ru/), so assert the page-specific canonical URL — it uniquely identifies the
+          # rendered legal doc reaching the edge, not the landing catch-all. Read only the <head>
+          # (head -c 4096; the canonical link sits in the first bytes): the check is then
+          # size-independent, so the large EULA page does not exceed the timeout while the monitoring
+          # stack is still booting post-deploy and starving the CPU-capped renderer. Retry like the
+          # landing/gateway/backend probe to ride out that window.
+          for route in privacy eula; do
+            ok=
+            for i in $(seq 1 20); do
+              head_out="$(docker run --rm --network edge alpine:3.20 sh -c "wget -q -T 10 -O - http://scrabble/${route}/ 2>/dev/null | head -c 4096" || true)"
+              if printf '%s' "$head_out" | grep -qF "erudit-game.ru/${route}/"; then
+                echo "ok: /${route}/ serves the rendered legal page"
+                ok=1
+                break
+              fi
+              sleep 3
+            done
+            if [ -z "$ok" ]; then
+              echo "FAIL: /${route}/ did not serve the rendered legal page (@legal route missing?)"
+              docker logs --tail 50 scrabble-renderer || true
+              exit 1
+            fi
+          done
+
       - name: Probe the /pay/ callback route reaches the gateway
         run: |
           set -u

.gitea/workflows/prod-deploy.yaml

@@ -112,6 +112,12 @@ jobs:
       # derived from PUBLIC_BASE_URL in deploy/write-prod-env.sh.
       VITE_VK_APP_ID: ${{ vars.VITE_VK_APP_ID }}
       GATEWAY_VK_ID_CLIENT_SECRET: ${{ secrets.GATEWAY_VK_ID_CLIENT_SECRET }}
+      # Client-version gate (ARCHITECTURE.md §2): plain (unprefixed) vars, shared across contours
+      # (empty ⇒ dormant). On prod the stamped client version is a real semver, so the gate enforces
+      # here — set GATEWAY_MIN_CLIENT_VERSION to the release in the same rollout that ships a breaking
+      # wire change; bump GATEWAY_RECOMMENDED_CLIENT_VERSION (≥ min) to nudge upgrades softly.
+      GATEWAY_MIN_CLIENT_VERSION: ${{ vars.GATEWAY_MIN_CLIENT_VERSION }}
+      GATEWAY_RECOMMENDED_CLIENT_VERSION: ${{ vars.GATEWAY_RECOMMENDED_CLIENT_VERSION }}
       # Planted honeytoken bearer: presenting it earns a 24h IP ban + a high-severity alarm.
       # Per-contour secret; empty = trap off. Rendered by deploy/write-prod-env.sh.
       GATEWAY_HONEYTOKEN: ${{ secrets.PROD_GATEWAY_HONEYTOKEN }}

CLAUDE.md

@@ -156,3 +156,11 @@ The `ui` module is a Node project (pnpm), **not** in `go.work`; it is the `ui` j
 the single `.gitea/workflows/ci.yaml`. Committed edge codegen under `ui/src/gen/`
 (regenerate with `pnpm codegen`); pnpm build-script approval lives in
 `ui/pnpm-workspace.yaml` (`allowBuilds: esbuild: true`).
+
+## Agent field notes
+
+Non-obvious, hard-won knowledge the agent has accumulated that is **not** captured in the docs above,
+kept in the repo so it travels with a clone. Verify any named file/flag against current code before
+acting on it.
+
+@.claude/CLAUDE.md

assets/icons/README.md

@@ -1,41 +1,18 @@
-# Erudit — site icons + Open Graph card
+# Icons
 
-The favicon set and the `og:image` link-preview card for the public landing
+The whole shipped icon set is sliced from **one master** — see
-(`ui/landing.html`) and the SPA shell (`ui/index.html`). Same design language as the
+[`brand/`](brand/) for the reference generator, the pinned font and the committed
-[VK loading-screen logo](../vk/README.md): the wooden Erudit «Э» tile (score `8`),
+outputs, and [`../../docs/ICON_BRANDBOOK.md`](../../docs/ICON_BRANDBOOK.md) for how the
-with the wordmark on the app's dark board green (`ui/src/app.css` tokens).
+mark is constructed. The per-platform target map (which file goes where) is in
-
+[`../../docs/ICONS.md`](../../docs/ICONS.md).
-| Output (committed to `ui/public/`) | Purpose |
-|------|---------|
-| `favicon.svg` | Vector favicon, transparent; tile + «Э» only (the score is illegible below ~32 px). |
-| `favicon.ico` | 32×32 PNG-in-ICO fallback (also answers the browsers' blind `/favicon.ico` probe). |
-| `apple-touch-icon.png` | 180×180 opaque full-bleed tile; iOS masks its own corners. |
-| `og-image.png` | 1200×630 card: tile + «Эрудит / Скрэббл — игра в слова». Referenced absolutely as `https://erudit-game.ru/og-image.png`. |
-
-## How it works
-
-`build/extract.js` extracts the needed glyph outlines (tile glyphs + every wordmark
-character) from LiberationSans (Arial-metric, the game's font stack) with their
-advance widths into `build/glyphs.json` (committed). `build/generate.js` composes
-plain SVG from those outlines — no font is needed at generation time — writes
-`favicon.svg` and rasterises the PNG/ICO outputs by screenshotting the SVGs with the
-`ui` package's Playwright chromium (`@playwright/test`); the `.ico` container is
-assembled in-script (a single PNG entry). Raster bytes therefore depend on the
-installed chromium version; the SVG sources are deterministic.
-
-## Regenerate
-
-Requirements: Node ≥ 18, `ui` installed (`pnpm install`, provides Playwright).
-`extract.js` additionally needs `opentype.js` (`npm i opentype.js`); **`generate.js`
-needs no extra packages**.
 
 ```sh
-cd assets/icons
+cd brand
-
+npm i opentype.js
-# 1. (optional) re-extract the glyphs — only if the font or the wordmark changes:
+node build-set.mjs          # web (ui/public) + Capacitor layers (ui/assets) + vk/ tg/ store/
-#    default font: /usr/share/fonts/truetype/liberation/LiberationSans-Regular.ttf
+node build-android-res.mjs  # Android launcher resources (all densities + monochrome)
-node build/extract.js [/path/to/font.ttf]      # -> build/glyphs.json
-
-# 2. regenerate everything in ui/public/:
-node build/generate.js
 ```
+
+> The earlier `build/` pipeline (LiberationSans glyph outlines → favicon/apple-touch/OG)
+> was replaced by `brand/` when the icon was rebranded onto the Spectral «Э» master.
+> The separate VK loading-screen animation lives in [`../vk/`](../vk/) and is unrelated.

assets/icons/brand/.gitignore

@@ -0,0 +1,2 @@
+node_modules/
+package-lock.json

assets/icons/brand/README.md

@@ -0,0 +1,32 @@
+# Erudit icon — brand master
+
+The reference construction of the Erudit app icon. The authoritative, human-readable
+spec lives in [`docs/ICON_BRANDBOOK.md`](../../../docs/ICON_BRANDBOOK.md); this folder
+holds the machine reproduction of exactly what that document describes.
+
+| File | What |
+|------|------|
+| `build-icon.mjs` | reference generator — every dimension is a fraction of the side, matching the brand book |
+| `render-png.mjs` | rasterises an icon SVG to PNG via the `ui` package's Playwright chromium |
+| `Spectral-Bold.ttf` | the «Э» typeface (SIL OFL, `Spectral-OFL.txt`) — pinned so the letter never drifts |
+| `icon-light.svg` / `.png` | the light master (1024) |
+| `icon-dark.svg` / `.png` | the dark master (1024) |
+| `icon-construction.svg` / `.png` | the percent-annotated construction scheme (figure in the brand book) |
+
+## Regenerate
+
+```sh
+cd assets/icons/brand
+npm i opentype.js                       # the only extra dep; render uses ui's chromium
+
+node build-icon.mjs --variant light  > icon-light.svg
+node build-icon.mjs --variant dark   > icon-dark.svg
+node build-icon.mjs --variant light --scheme > icon-construction.svg
+
+node render-png.mjs icon-light.svg  icon-light.png  1024
+node render-png.mjs icon-dark.svg   icon-dark.png   1024
+node render-png.mjs icon-construction.svg icon-construction.png 2048
+```
+
+The SVGs are resolution-free; render at any size. Downstream slicing (favicon / PWA /
+iOS / Android) is a separate step — see [`docs/ICONS.md`](../../../docs/ICONS.md).

assets/icons/brand/Spectral-OFL.txt

@@ -0,0 +1,93 @@
+Copyright 2017 The Spectral Project Authors (https://github.com/productiontype/Spectral)
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+https://openfontlicense.org
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.

assets/icons/brand/build-android-res.mjs

@@ -0,0 +1,47 @@
+'use strict';
+// Generate the Android launcher resources from the committed layers, at every
+// density, with NO inset (our layers already fill the 108 dp canvas) and a
+// monochrome (themed) layer. Run build-set.mjs first (it writes the layer PNGs).
+//
+//   npm i opentype.js  # (only build-icon/build-set need it; this reads PNGs)
+//   node build-set.mjs && node build-android-res.mjs
+//
+// Writes ui/android/app/src/main/res/mipmap-*/ic_launcher{,_round,_foreground,
+// _background,_monochrome}.png. The two mipmap-anydpi-v26/*.xml are committed by hand.
+import { readFileSync, writeFileSync } from 'node:fs';
+import { fileURLToPath } from 'node:url';
+import { dirname, join } from 'node:path';
+
+const DIR = dirname(fileURLToPath(import.meta.url));
+const ROOT = join(DIR, '..', '..', '..');
+const RES = join(ROOT, 'ui', 'android', 'app', 'src', 'main', 'res');
+const uri = p => 'data:image/png;base64,' + readFileSync(p).toString('base64');
+const BG = uri(join(ROOT, 'ui', 'assets', 'icon-background.png'));
+const FG = uri(join(ROOT, 'ui', 'assets', 'icon-foreground.png'));
+const MONO = uri(join(DIR, 'android-monochrome.png'));
+
+// density: [adaptive-layer px (108 dp), legacy launcher px (48 dp)]
+const D = { ldpi: [81, 36], mdpi: [108, 48], hdpi: [162, 72], xhdpi: [216, 96], xxhdpi: [324, 144], xxxhdpi: [432, 192] };
+
+const pw = await import(join(ROOT, 'ui', 'node_modules', '@playwright', 'test', 'index.js'));
+const { chromium } = pw.default ?? pw;
+const browser = await chromium.launch();
+const page = await browser.newPage({ deviceScaleFactor: 1 });
+const im = (u, s) => `<img src="${u}" width="${s}" height="${s}" style="display:block">`;
+async function shot(html, s, transparent) {
+  await page.setViewportSize({ width: s, height: s });
+  await page.setContent(`<!doctype html><meta charset=utf8><style>*{margin:0;padding:0}#r{width:${s}px;height:${s}px}</style><div id=r>${html}</div>`, { waitUntil: 'networkidle' });
+  return page.locator('#r').screenshot({ omitBackground: !!transparent });
+}
+for (const [d, [fg, lg]] of Object.entries(D)) {
+  const dir = join(RES, `mipmap-${d}`);
+  writeFileSync(join(dir, 'ic_launcher_background.png'), await shot(im(BG, fg), fg, false));
+  writeFileSync(join(dir, 'ic_launcher_foreground.png'), await shot(im(FG, fg), fg, true));
+  writeFileSync(join(dir, 'ic_launcher_monochrome.png'), await shot(im(MONO, fg), fg, true));
+  const comp = `<div style="position:relative;width:${lg}px;height:${lg}px">${im(BG, lg)}<div style="position:absolute;inset:0">${im(FG, lg)}</div></div>`;
+  writeFileSync(join(dir, 'ic_launcher.png'), await shot(comp, lg, false));
+  const round = `<div style="width:${lg}px;height:${lg}px;border-radius:50%;overflow:hidden;position:relative">${im(BG, lg)}<div style="position:absolute;inset:0">${im(FG, lg)}</div></div>`;
+  writeFileSync(join(dir, 'ic_launcher_round.png'), await shot(round, lg, true));
+  console.log('mipmap-' + d, 'ok');
+}
+await browser.close();

assets/icons/brand/build-icon.mjs

@@ -0,0 +1,159 @@
+'use strict';
+// Erudit app-icon — the reference generator. Every dimension below is a FRACTION
+// of the icon side, so this file reads the same as docs/ICON_BRANDBOOK.md and the
+// icon reproduces at any resolution. Emits one variant/layer's SVG to stdout.
+//
+//   node build-icon.mjs --variant light|dark [--layer full|background|foreground] [--scheme] > icon.svg
+//
+// Layers (for Android adaptive icons):
+//   full        the standalone master (rounded tile + mark) — iOS / PWA / favicon
+//   background  wood + grain + light/shadow, full-bleed square (the OS applies the mask)
+//   foreground  only «Э» + ✻, transparent, re-placed for the round mask (see FG_* below)
+//
+// Deps: opentype.js (npm i opentype.js). Font: ./Spectral-Bold.ttf (OFL, bundled).
+import { readFileSync } from 'node:fs';
+import { fileURLToPath } from 'node:url';
+import { dirname, join } from 'node:path';
+import opentype from 'opentype.js';
+
+const DIR = dirname(fileURLToPath(import.meta.url));
+const args = process.argv.slice(2);
+const has = f => args.includes('--' + f);
+const val = (f, d) => { const i = args.indexOf('--' + f); return i >= 0 ? args[i + 1] : d; };
+
+// ---- the design, in fractions of the side ----
+const S = 1024;                       // reference side (the icon is resolution-free)
+const RADIUS   = 0.17;                // tile corner radius (full master)
+const STAR_BULB = 0.22;               // spoke-end (and hub) radius, as fraction of star radius
+const STAR_SPOKES = 6;
+const GRAIN_COLS = 6, GRAIN_W = 1 / 32, GRAIN_SHIFT = 1 / 16, GRAIN_TILT = 4;
+const SHEEN = 0.15;                   // white, transparent bottom-left -> this alpha top-right
+const SHADE = 0.15;                   // black, this alpha bottom-left -> transparent top-right
+
+// The mark, placed for the standalone master (bottom-right biased, full-bleed):
+const MASTER = { lh: 0.6055, lc: [0.4814, 0.4922], sd: 0.1729, sc: [0.7881, 0.7881] };
+// The mark, placed for the Android foreground layer (centred-ish inside the 61% safe
+// zone, nudged right 8% / down 3% for optical balance under the round mask; smaller ✻):
+const FOREGROUND = { lh: 0.5391, lc: [0.5234, 0.4951], sd: 0.1318, sc: [0.7627, 0.7266] };
+
+const PALETTE = {
+  light: { wood: '#e6b053', ink: '#5a3a12', grain: '#d8a54e' },
+  dark:  { wood: '#4a3316', ink: '#f2d9a0', grain: '#432e14' },
+};
+
+// Layers:
+//   full        rounded tile + master mark        (favicon.svg — browser rounds nothing)
+//   flat        square tile + master mark          (apple-touch, PWA "any" — OS rounds)
+//   background  square tile, no mark               (Android adaptive background)
+//   foreground  mark only, transparent             (Android adaptive foreground)
+//   maskable    square tile + foreground mark       (PWA maskable — safe-zone aware)
+//   monochrome  foreground mark only, flat colour  (Android 13+ themed layer)
+const LAYERS = ['full', 'flat', 'background', 'foreground', 'maskable', 'monochrome'];
+const variant = val('variant', 'light');
+const layer = val('layer', 'full');
+const P = PALETTE[variant];
+if (!P) { console.error(`unknown --variant ${variant} (light|dark)`); process.exit(1); }
+if (!LAYERS.includes(layer)) { console.error(`unknown --layer ${layer} (${LAYERS.join('|')})`); process.exit(1); }
+
+const usesForegroundPlacement = ['foreground', 'maskable', 'monochrome'].includes(layer);
+const drawBg = ['full', 'flat', 'background', 'maskable'].includes(layer);
+const drawMark = layer !== 'background';
+const MARK = usesForegroundPlacement ? FOREGROUND : MASTER;
+const inkColour = layer === 'monochrome' ? val('mono', '#ffffff') : P.ink;
+const RX = layer === 'full' ? RADIUS * S : 0;   // only the standalone master keeps rounded corners
+const font = opentype.parse(readFileSync(join(DIR, 'Spectral-Bold.ttf')).buffer);
+
+// «Э» outline scaled so its ink bounding box is MARK.lh of the side, box centred on MARK.lc.
+function letterSvg() {
+  const g = font.charToGlyph('Э');
+  const h0 = (() => { const b = g.getPath(0, 0, 1000).getBoundingBox(); return b.y2 - b.y1; })();
+  const scale = (MARK.lh * S) / h0;
+  const p = g.getPath(0, 0, 1000 * scale);
+  const bb = p.getBoundingBox();
+  const w = bb.x2 - bb.x1, h = bb.y2 - bb.y1;
+  const tx = MARK.lc[0] * S - (bb.x1 + w / 2);
+  const ty = MARK.lc[1] * S - (bb.y1 + h / 2);
+  return { svg: `<path transform="translate(${tx.toFixed(2)} ${ty.toFixed(2)})" d="${p.toPathData(2)}" fill="${inkColour}"/>`,
+           box: { x: bb.x1 + tx, y: bb.y1 + ty, w, h } };
+}
+
+// Teardrop-spoked asterisk ✻: each spoke tapers to a point at the centre and ends
+// in a round bulb; a central disc equal to the bulb fuses them.
+function starPath() {
+  const cx = MARK.sc[0] * S, cy = MARK.sc[1] * S, Rout = MARK.sd * S / 2;
+  const rb = Rout * STAR_BULB, R = Rout - rb;
+  const L = Math.sqrt(R * R - rb * rb), theta = Math.asin(rb / R);
+  const rot = (v, t) => [v[0] * Math.cos(t) - v[1] * Math.sin(t), v[0] * Math.sin(t) + v[1] * Math.cos(t)];
+  let d = '';
+  for (let k = 0; k < STAR_SPOKES; k++) {
+    const a = -Math.PI / 2 + k * 2 * Math.PI / STAR_SPOKES;
+    const u = [Math.cos(a), Math.sin(a)];
+    const d1 = rot(u, theta), d2 = rot(u, -theta);
+    const T1 = [cx + L * d1[0], cy + L * d1[1]], T2 = [cx + L * d2[0], cy + L * d2[1]];
+    d += `M${cx.toFixed(2)} ${cy.toFixed(2)} L${T1[0].toFixed(2)} ${T1[1].toFixed(2)} A${rb.toFixed(2)} ${rb.toFixed(2)} 0 1 0 ${T2[0].toFixed(2)} ${T2[1].toFixed(2)} Z `;
+  }
+  d += `M${cx} ${cy} m${-rb} 0 a${rb} ${rb} 0 1 0 ${2 * rb} 0 a${rb} ${rb} 0 1 0 ${-2 * rb} 0 Z`;
+  return `<path d="${d}" fill="${inkColour}"/>`;
+}
+
+function grain() {
+  const colW = S / GRAIN_COLS, sw = GRAIN_W * S, shift = GRAIN_SHIFT * S;
+  const yTop = -0.2 * S, yBot = 1.2 * S, cy = S / 2;
+  let s = '';
+  for (let i = 1; i <= GRAIN_COLS; i++) {
+    const xr = i * colW - shift, x = xr - sw, cx = xr - sw / 2;
+    s += `<rect x="${x.toFixed(2)}" y="${yTop.toFixed(2)}" width="${sw.toFixed(2)}" height="${(yBot - yTop).toFixed(2)}" fill="${P.grain}" transform="rotate(${GRAIN_TILT} ${cx.toFixed(2)} ${cy.toFixed(2)})"/>`;
+  }
+  return `<g clip-path="url(#tile)">${s}</g>`;
+}
+
+let body = '';
+const L = letterSvg();
+if (drawBg) {                           // tile + grain + light/shadow (the background)
+  body += `<rect width="${S}" height="${S}" rx="${RX}" fill="${P.wood}"/>`
+    + `<defs><clipPath id="tile"><rect width="${S}" height="${S}" rx="${RX}"/></clipPath>`
+    +   `<linearGradient id="sheen" gradientUnits="userSpaceOnUse" x1="0" y1="${S}" x2="${S}" y2="0"><stop offset="0" stop-color="#fff" stop-opacity="0"/><stop offset="1" stop-color="#fff" stop-opacity="${SHEEN}"/></linearGradient>`
+    +   `<linearGradient id="shade" gradientUnits="userSpaceOnUse" x1="0" y1="${S}" x2="${S}" y2="0"><stop offset="0" stop-color="#000" stop-opacity="${SHADE}"/><stop offset="1" stop-color="#000" stop-opacity="0"/></linearGradient>`
+    + `</defs>`
+    + grain()
+    + `<rect width="${S}" height="${S}" fill="url(#sheen)" clip-path="url(#tile)"/>`
+    + `<rect width="${S}" height="${S}" fill="url(#shade)" clip-path="url(#tile)"/>`;
+}
+if (drawMark) body += L.svg + starPath();   // the mark
+if (has('scheme')) body += scheme(L);
+
+process.stdout.write(`<svg xmlns="http://www.w3.org/2000/svg" width="${S}" height="${S}" viewBox="0 0 ${S} ${S}">${body}</svg>\n`);
+
+// Percent-based construction overlay for the brand book (full master only).
+function scheme(L) {
+  const pc = n => (100 * n / S).toFixed(1) + '%';
+  const GC = '#0f172a', BX = '#d81b60', AC = '#0d9488';
+  const halo = 'paint-order="stroke" stroke="#fff" stroke-width="4"';
+  const cx = MARK.sc[0] * S, cy = MARK.sc[1] * S, sd = MARK.sd * S;
+  let g = `<g font-family="'Helvetica Neue',Arial,sans-serif">`;
+  for (let f = 1; f <= 3; f++) {
+    const p = f * S / 4;
+    g += `<line x1="${p}" y1="0" x2="${p}" y2="${S}" stroke="${GC}" stroke-opacity="0.18" stroke-width="1.2"/>`;
+    g += `<line x1="0" y1="${p}" x2="${S}" y2="${p}" stroke="${GC}" stroke-opacity="0.18" stroke-width="1.2"/>`;
+    g += `<text x="${p + 4}" y="20" font-size="17" font-weight="700" fill="${GC}" ${halo}>${f * 25}%</text>`;
+    g += `<text x="4" y="${p - 4}" font-size="17" font-weight="700" fill="${GC}" ${halo}>${f * 25}%</text>`;
+  }
+  g += `<line x1="${0.14 * S}" y1="${0.86 * S}" x2="${0.86 * S}" y2="${0.14 * S}" stroke="${AC}" stroke-width="3" stroke-dasharray="3 8" stroke-linecap="round"/>`;
+  g += `<circle cx="${0.86 * S}" cy="${0.14 * S}" r="6" fill="${AC}"/><circle cx="${0.14 * S}" cy="${0.86 * S}" r="6" fill="${AC}"/>`;
+  g += `<text x="${0.86 * S - 6}" y="${0.14 * S - 12}" text-anchor="end" font-size="18" font-weight="700" fill="${AC}" ${halo}>light: white 0%→15%</text>`;
+  g += `<text x="${0.14 * S + 10}" y="${0.86 * S + 26}" font-size="18" font-weight="700" fill="${AC}" ${halo}>shadow: black 15%→0%</text>`;
+  const { x, y, w, h } = L.box;
+  g += `<rect x="${x.toFixed(1)}" y="${y.toFixed(1)}" width="${w.toFixed(1)}" height="${h.toFixed(1)}" fill="none" stroke="${BX}" stroke-width="2.5"/>`;
+  g += `<line x1="${MARK.lc[0] * S}" y1="${MARK.lc[1] * S - 16}" x2="${MARK.lc[0] * S}" y2="${MARK.lc[1] * S + 16}" stroke="${BX}" stroke-width="2.5"/><line x1="${MARK.lc[0] * S - 16}" y1="${MARK.lc[1] * S}" x2="${MARK.lc[0] * S + 16}" y2="${MARK.lc[1] * S}" stroke="${BX}" stroke-width="2.5"/>`;
+  g += `<text x="${x.toFixed(1)}" y="${(y - 10).toFixed(1)}" font-size="19" font-weight="700" fill="${BX}" ${halo}>«Э» Spectral Bold · box H ${pc(h)} · W ${pc(w)}</text>`;
+  g += `<text x="${x.toFixed(1)}" y="${(y + h + 24).toFixed(1)}" font-size="18" font-weight="700" fill="${BX}" ${halo}>box center ${pc(MARK.lc[0] * S)} / ${pc(MARK.lc[1] * S)}</text>`;
+  g += `<rect x="${cx - sd / 2}" y="${cy - sd / 2}" width="${sd}" height="${sd}" fill="none" stroke="${BX}" stroke-width="2.5"/>`;
+  g += `<line x1="${cx}" y1="${cy - 14}" x2="${cx}" y2="${cy + 14}" stroke="${BX}" stroke-width="2.5"/><line x1="${cx - 14}" y1="${cy}" x2="${cx + 14}" y2="${cy}" stroke="${BX}" stroke-width="2.5"/>`;
+  g += `<text x="${(cx + sd / 2).toFixed(1)}" y="${(cy - sd / 2 - 10).toFixed(1)}" text-anchor="end" font-size="18" font-weight="700" fill="${BX}" ${halo}>✻ Ø ${pc(sd)} · center ${pc(cx)} / ${pc(cy)}</text>`;
+  g += `<text x="${RX + 14}" y="${RX - 6}" font-size="17" font-weight="700" fill="${GC}" ${halo}>corner r = 17%</text>`;
+  g += `<path d="M4 ${RX} A ${RX} ${RX} 0 0 1 ${RX} 4" fill="none" stroke="${GC}" stroke-width="2" stroke-dasharray="5 5"/>`;
+  g += `<rect x="${0.03 * S}" y="${S - 96}" width="${0.94 * S}" height="74" rx="12" fill="#0f172a" fill-opacity="0.82"/>`;
+  g += `<text x="${0.055 * S}" y="${S - 64}" font-size="18" font-weight="600" fill="#fff">Wood grain: 6 equal columns; a vertical stripe on each column's right edge,</text>`;
+  g += `<text x="${0.055 * S}" y="${S - 40}" font-size="18" font-weight="600" fill="#fff">width 1/32 of side; the whole set shifted left 1/16; every stripe tilted 4°.</text>`;
+  return g + `</g>`;
+}

assets/icons/brand/build-set.mjs

@@ -0,0 +1,105 @@
+'use strict';
+// Slice the whole shipped icon set from the brand master (build-icon.mjs). Renders
+// with the ui package's Playwright chromium. See docs/ICONS.md for the target map.
+//
+//   npm i opentype.js && node build-set.mjs
+//
+// Writes: ui/public/* (web), ui/assets/* (Capacitor layers), ./vk/* and ./store/*
+// (manual-upload art). Wiring (manifest, html, Android res) is done separately.
+import { execFileSync } from 'node:child_process';
+import { readFileSync, writeFileSync, mkdirSync } from 'node:fs';
+import { fileURLToPath } from 'node:url';
+import { dirname, join } from 'node:path';
+
+const DIR = dirname(fileURLToPath(import.meta.url));
+const UI = join(DIR, '..', '..', '..', 'ui');
+const PUB = join(UI, 'public'), ASSETS = join(UI, 'assets');
+const VK = join(DIR, 'vk'), STORE = join(DIR, 'store'), TG = join(DIR, 'tg');
+[VK, STORE, TG].forEach(d => mkdirSync(d, { recursive: true }));
+
+// one SVG string for a variant+layer from the reference generator
+const svgFor = (variant, layer) =>
+  execFileSync('node', [join(DIR, 'build-icon.mjs'), '--variant', variant, '--layer', layer], { encoding: 'utf8' });
+
+const pw = await import(join(UI, 'node_modules', '@playwright', 'test', 'index.js'));
+const { chromium } = pw.default ?? pw;
+const browser = await chromium.launch();
+const page = await browser.newPage();
+
+async function pngFromSvg(svg, size, transparent) {
+  await page.setViewportSize({ width: size, height: size });
+  await page.setContent(`<!doctype html><meta charset=utf8><style>*{margin:0;padding:0}svg{display:block;width:${size}px;height:${size}px}</style>${svg}`, { waitUntil: 'networkidle' });
+  return page.locator('svg').screenshot({ omitBackground: !!transparent });
+}
+async function shootHtml(html, w, h) {
+  await page.setViewportSize({ width: w, height: h });
+  await page.setContent(html, { waitUntil: 'networkidle' });
+  return page.screenshot();
+}
+function icoFromPNG(png, sizePx) {
+  const h = Buffer.alloc(22);
+  h.writeUInt16LE(0, 0); h.writeUInt16LE(1, 2); h.writeUInt16LE(1, 4);
+  h.writeUInt8(sizePx, 6); h.writeUInt8(sizePx, 7);
+  h.writeUInt16LE(1, 10); h.writeUInt16LE(32, 12);
+  h.writeUInt32LE(png.length, 14); h.writeUInt32LE(22, 18);
+  return Buffer.concat([h, png]);
+}
+const write = (p, buf) => { writeFileSync(p, buf); console.log('wrote', p.replace(join(DIR, '..', '..', '..'), '.'), buf.length, 'b'); };
+
+// ---- pre-render the SVG sources we need ----
+const S = {
+  fullLight: svgFor('light', 'full'), fullDark: svgFor('dark', 'full'),
+  flatLight: svgFor('light', 'flat'), flatDark: svgFor('dark', 'flat'),
+  maskLight: svgFor('light', 'maskable'), maskDark: svgFor('dark', 'maskable'),
+  bgLight: svgFor('light', 'background'), fgLight: svgFor('light', 'foreground'),
+  monoLight: svgFor('light', 'monochrome'),
+};
+
+// ---- favicon.svg: light + dark in one file, toggled by prefers-color-scheme ----
+const inner = svg => svg.replace(/^<svg[^>]*>/, '').replace(/<\/svg>\s*$/, '');
+const faviconSvg =
+  `<svg xmlns="http://www.w3.org/2000/svg" width="1024" height="1024" viewBox="0 0 1024 1024">`
+  + `<style>.d{display:none}@media(prefers-color-scheme:dark){.l{display:none}.d{display:inline}}</style>`
+  + `<g class="l">${inner(S.fullLight)}</g><g class="d">${inner(S.fullDark)}</g></svg>\n`;
+write(join(PUB, 'favicon.svg'), Buffer.from(faviconSvg));
+
+// ---- web rasters ----
+write(join(PUB, 'favicon.ico'), icoFromPNG(await pngFromSvg(S.flatLight, 32, false), 32));
+write(join(PUB, 'apple-touch-icon.png'), await pngFromSvg(S.flatLight, 180, false));
+write(join(PUB, 'icon-192.png'), await pngFromSvg(S.flatLight, 192, false));
+write(join(PUB, 'icon-512.png'), await pngFromSvg(S.flatLight, 512, false));
+write(join(PUB, 'icon-192-dark.png'), await pngFromSvg(S.flatDark, 192, false));
+write(join(PUB, 'icon-512-dark.png'), await pngFromSvg(S.flatDark, 512, false));
+write(join(PUB, 'icon-maskable-512.png'), await pngFromSvg(S.maskLight, 512, false));
+write(join(PUB, 'icon-maskable-512-dark.png'), await pngFromSvg(S.maskDark, 512, false));
+
+// ---- Capacitor layers (ui/assets) ----
+write(join(ASSETS, 'icon.png'), await pngFromSvg(S.flatLight, 1024, false));          // legacy single
+write(join(ASSETS, 'icon-foreground.png'), await pngFromSvg(S.fgLight, 1024, true));   // adaptive fg
+write(join(ASSETS, 'icon-background.png'), await pngFromSvg(S.bgLight, 1024, false));  // adaptive bg
+write(join(DIR, 'android-monochrome.png'), await pngFromSvg(S.monoLight, 1024, true)); // themed layer (wired manually)
+
+// ---- VK (no rounding — flat light) ----
+for (const px of [576, 278, 150, 32]) write(join(VK, `vk-${px}.png`), await pngFromSvg(S.flatLight, px, false));
+
+// ---- Telegram bot: square, no rounding (TG crops the avatar to a circle) ----
+write(join(TG, 'tg-512.png'), await pngFromSvg(S.flatLight, 512, false));   // bot avatar + Mini App icon
+
+// ---- store art ----
+write(join(STORE, 'rustore-512.png'), await pngFromSvg(S.flatLight, 512, false));
+
+// ---- wordmark banner (board-green bg + master tile + «Эрудит» / Игра в слова) ----
+const b64 = readFileSync(join(DIR, 'Spectral-Bold.ttf')).toString('base64');
+const banner = (w, h, tile, t1, t2, gap, pad) => `<!doctype html><meta charset=utf8><style>
+@font-face{font-family:Spectral;src:url(data:font/ttf;base64,${b64});font-weight:700}
+*{margin:0;padding:0;box-sizing:border-box}
+body{width:${w}px;height:${h}px;background:#2a3330;display:flex;align-items:center;gap:${gap}px;padding:0 ${pad}px;font-family:Spectral}
+.tile{width:${tile}px;height:${tile}px;flex:none}.tile svg{width:${tile}px;height:${tile}px;display:block}
+.wm{color:#e7ece8;text-align:center}.t1{font-weight:700;font-size:${t1}px;line-height:1.02;letter-spacing:-2px}
+.t2{font-weight:700;font-size:${t2}px;line-height:1.1;color:#cdd6cf;margin-top:6px}
+</style><div class=tile>${S.fullLight}</div><div class=wm><div class=t1>«Эрудит»</div><div class=t2>Игра в слова</div></div>`;
+write(join(PUB, 'og-image.png'), await shootHtml(banner(1200, 630, 300, 150, 74, 64, 96), 1200, 630));
+write(join(TG, 'tg-demo-640x360.png'), await shootHtml(banner(640, 360, 150, 72, 38, 30, 44), 640, 360));
+
+await browser.close();
+console.log('done');

assets/icons/brand/icon-dark-android-background.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="1024" height="1024" viewBox="0 0 1024 1024"><rect width="1024" height="1024" rx="0" fill="#4a3316"/><defs><clipPath id="tile"><rect width="1024" height="1024" rx="0"/></clipPath><linearGradient id="sheen" gradientUnits="userSpaceOnUse" x1="0" y1="1024" x2="1024" y2="0"><stop offset="0" stop-color="#fff" stop-opacity="0"/><stop offset="1" stop-color="#fff" stop-opacity="0.15"/></linearGradient><linearGradient id="shade" gradientUnits="userSpaceOnUse" x1="0" y1="1024" x2="1024" y2="0"><stop offset="0" stop-color="#000" stop-opacity="0.15"/><stop offset="1" stop-color="#000" stop-opacity="0"/></linearGradient></defs><g clip-path="url(#tile)"><rect x="74.67" y="-204.80" width="32.00" height="1433.60" fill="#432e14" transform="rotate(4 90.67 512.00)"/><rect x="245.33" y="-204.80" width="32.00" height="1433.60" fill="#432e14" transform="rotate(4 261.33 512.00)"/><rect x="416.00" y="-204.80" width="32.00" height="1433.60" fill="#432e14" transform="rotate(4 432.00 512.00)"/><rect x="586.67" y="-204.80" width="32.00" height="1433.60" fill="#432e14" transform="rotate(4 602.67 512.00)"/><rect x="757.33" y="-204.80" width="32.00" height="1433.60" fill="#432e14" transform="rotate(4 773.33 512.00)"/><rect x="928.00" y="-204.80" width="32.00" height="1433.60" fill="#432e14" transform="rotate(4 944.00 512.00)"/></g><rect width="1024" height="1024" fill="url(#sheen)" clip-path="url(#tile)"/><rect width="1024" height="1024" fill="url(#shade)" clip-path="url(#tile)"/></svg>

assets/icons/brand/icon-dark-android-foreground.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="1024" height="1024" viewBox="0 0 1024 1024"><path transform="translate(237.62 774.88)" d="M250.04-34.91Q326.35-34.91 368.57-91.33Q410.78-147.75 410.78-243.55Q410.78-249.23 410.78-254.91L254.10-254.91L208.64-185.91L195.65-185.91L195.65-368.57L208.64-368.57L254.10-299.56L407.53-299.56Q396.98-392.92 351.52-447.72Q306.06-502.52 241.11-502.52Q217.57-502.52 198.90-498.46Q180.22-494.40 162.36-482.22L83.62-354.77L69-354.77L77.93-505.76Q112.84-522.81 154.25-533.37Q195.65-543.92 259.78-543.92Q319.86-543.92 371.41-523.22Q422.96-502.52 460.71-465.58Q498.46-428.64 519.57-378.31Q540.67-327.98 540.67-267.90Q540.67-188.34 504.55-125.83Q468.42-63.32 405.10-27.60Q341.78 8.12 259.78 8.12Q200.52 8.12 150.59-3.25Q100.67-14.61 67.38-34.10L56.02-171.29L69.82-171.29L142.88-63.32Q165.61-50.33 191.59-42.62Q217.57-34.91 250.04-34.91" fill="#f2d9a0"/><path d="M781.00 744.04 L795.25 695.59 A14.85 14.85 0 1 0 766.76 695.59 Z M781.00 744.04 L830.08 732.15 A14.85 14.85 0 1 0 815.84 707.48 Z M781.00 744.04 L815.84 780.60 A14.85 14.85 0 1 0 830.08 755.93 Z M781.00 744.04 L766.76 792.49 A14.85 14.85 0 1 0 795.25 792.49 Z M781.00 744.04 L731.93 755.93 A14.85 14.85 0 1 0 746.17 780.60 Z M781.00 744.04 L746.17 707.48 A14.85 14.85 0 1 0 731.93 732.15 Z M781.0048 744.0384 m-14.845952 0 a14.845952 14.845952 0 1 0 29.691904 0 a14.845952 14.845952 0 1 0 -29.691904 0 Z" fill="#f2d9a0"/></svg>

assets/icons/brand/icon-dark.svg

@@ -0,0 +1 @@
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assets/icons/brand/icon-light-android-background.svg

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+<svg xmlns="http://www.w3.org/2000/svg" width="1024" height="1024" viewBox="0 0 1024 1024"><rect width="1024" height="1024" rx="0" fill="#e6b053"/><defs><clipPath id="tile"><rect width="1024" height="1024" rx="0"/></clipPath><linearGradient id="sheen" gradientUnits="userSpaceOnUse" x1="0" y1="1024" x2="1024" y2="0"><stop offset="0" stop-color="#fff" stop-opacity="0"/><stop offset="1" stop-color="#fff" stop-opacity="0.15"/></linearGradient><linearGradient id="shade" gradientUnits="userSpaceOnUse" x1="0" y1="1024" x2="1024" y2="0"><stop offset="0" stop-color="#000" stop-opacity="0.15"/><stop offset="1" stop-color="#000" stop-opacity="0"/></linearGradient></defs><g clip-path="url(#tile)"><rect x="74.67" y="-204.80" width="32.00" height="1433.60" fill="#d8a54e" transform="rotate(4 90.67 512.00)"/><rect x="245.33" y="-204.80" width="32.00" height="1433.60" fill="#d8a54e" transform="rotate(4 261.33 512.00)"/><rect x="416.00" y="-204.80" width="32.00" height="1433.60" fill="#d8a54e" transform="rotate(4 432.00 512.00)"/><rect x="586.67" y="-204.80" width="32.00" height="1433.60" fill="#d8a54e" transform="rotate(4 602.67 512.00)"/><rect x="757.33" y="-204.80" width="32.00" height="1433.60" fill="#d8a54e" transform="rotate(4 773.33 512.00)"/><rect x="928.00" y="-204.80" width="32.00" height="1433.60" fill="#d8a54e" transform="rotate(4 944.00 512.00)"/></g><rect width="1024" height="1024" fill="url(#sheen)" clip-path="url(#tile)"/><rect width="1024" height="1024" fill="url(#shade)" clip-path="url(#tile)"/></svg>

assets/icons/brand/icon-light-android-foreground.svg

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assets/icons/brand/icon-light.svg

@@ -0,0 +1 @@
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assets/icons/brand/package.json

@@ -0,0 +1,12 @@
+{
+  "name": "erudit-icon-brand",
+  "private": true,
+  "type": "module",
+  "description": "Reference generator for the Erudit app-icon set (see docs/ICON_BRANDBOOK.md).",
+  "scripts": {
+    "build": "node build-set.mjs && node build-android-res.mjs"
+  },
+  "dependencies": {
+    "opentype.js": "^1.3.4"
+  }
+}

assets/icons/brand/render-png.mjs

@@ -0,0 +1,21 @@
+'use strict';
+// Rasterise an icon SVG to PNG at a given size, using the `ui` package's cached
+// Playwright chromium (no extra install). Usage:
+//   node render-png.mjs <in.svg> <out.png> [size=1024]
+import { readFileSync, writeFileSync } from 'node:fs';
+import { fileURLToPath } from 'node:url';
+import { dirname, join } from 'node:path';
+
+const DIR = dirname(fileURLToPath(import.meta.url));
+const pw = await import(join(DIR, '..', '..', '..', 'ui', 'node_modules', '@playwright', 'test', 'index.js'));
+const { chromium } = pw.default ?? pw;
+
+const [, , svgPath, pngPath, size] = process.argv;
+const S = Number(size) || 1024;
+const svg = readFileSync(svgPath, 'utf8');
+const b = await chromium.launch();
+const pg = await b.newPage({ viewport: { width: S, height: S }, deviceScaleFactor: 1 });
+await pg.setContent(`<!doctype html><meta charset=utf8><style>*{margin:0;padding:0}</style>${svg}`, { waitUntil: 'networkidle' });
+writeFileSync(pngPath, await pg.locator('svg').screenshot({ omitBackground: true }));
+await b.close();
+console.log('wrote', pngPath, S + 'px');

assets/icons/build/extract.js

@@ -1,78 +0,0 @@
-'use strict';
-// Extract the glyph outlines the site icons and the og-image wordmark need from a
-// grotesque font (LiberationSans = Arial-metric, matching the game's system-ui/Arial
-// stack) and emit cubic-bezier contours per character, baseline at y=0, y-down,
-// plus the advance width so generate.js can lay out words without the font.
-// Same outline conversion as ../../vk/build/extract.js, generalised to a char set.
-const opentype = require('opentype.js');
-const fs = require('fs');
-
-const FONT = process.argv[2] || '/usr/share/fonts/truetype/liberation/LiberationSans-Regular.ttf';
-const b = fs.readFileSync(FONT);
-const font = opentype.parse(b.buffer.slice(b.byteOffset, b.byteOffset + b.byteLength));
-const FS = 1000; // em scale
-
-// The tile glyphs («Э», «8») + every character of the og-image wordmark lines
-// («Эрудит», «Скрэббл — игра в слова»). The space carries only an advance.
-const CHARS = [...new Set('Э8рудитСкэббл—игра в слова')];
-
-function glyphData(ch) {
-  const g = font.charToGlyph(ch);
-  const p = g.getPath(0, 0, FS); // baseline at y=0, y-down
-  const contours = [];
-  let cur = null, prev = null;
-  for (const c of p.commands) {
-    if (c.type === 'M') {
-      if (cur) contours.push(cur);
-      cur = [{ v: [c.x, c.y], i: [c.x, c.y], o: [c.x, c.y] }];
-      prev = { x: c.x, y: c.y };
-    } else if (c.type === 'L') {
-      cur.push({ v: [c.x, c.y], i: [c.x, c.y], o: [c.x, c.y] });
-      prev = { x: c.x, y: c.y };
-    } else if (c.type === 'C') {
-      cur[cur.length - 1].o = [c.x1, c.y1];
-      cur.push({ v: [c.x, c.y], i: [c.x2, c.y2], o: [c.x, c.y] });
-      prev = { x: c.x, y: c.y };
-    } else if (c.type === 'Q') {
-      const c1 = [prev.x + 2 / 3 * (c.x1 - prev.x), prev.y + 2 / 3 * (c.y1 - prev.y)];
-      const c2 = [c.x + 2 / 3 * (c.x1 - c.x), c.y + 2 / 3 * (c.y1 - c.y)];
-      cur[cur.length - 1].o = c1;
-      cur.push({ v: [c.x, c.y], i: c2, o: [c.x, c.y] });
-      prev = { x: c.x, y: c.y };
-    } else if (c.type === 'Z') {
-      if (cur && cur.length > 1) {
-        const last = cur[cur.length - 1], first = cur[0];
-        if (Math.hypot(last.v[0] - first.v[0], last.v[1] - first.v[1]) < 1e-3) {
-          first.i = last.i; // fold the duplicate closing point into the first
-          cur.pop();
-        }
-      }
-      if (cur) { contours.push(cur); cur = null; }
-    }
-  }
-  if (cur) contours.push(cur);
-
-  let minx = Infinity, miny = Infinity, maxx = -Infinity, maxy = -Infinity;
-  const out = contours.map(ct => {
-    const v = [], i = [], o = [];
-    ct.forEach(pt => {
-      v.push(pt.v);
-      i.push([pt.i[0] - pt.v[0], pt.i[1] - pt.v[1]]);
-      o.push([pt.o[0] - pt.v[0], pt.o[1] - pt.v[1]]);
-      minx = Math.min(minx, pt.v[0]); maxx = Math.max(maxx, pt.v[0]);
-      miny = Math.min(miny, pt.v[1]); maxy = Math.max(maxy, pt.v[1]);
-    });
-    return { i, o, v, c: true };
-  });
-  const bbox = out.length
-    ? { x: minx, y: miny, w: maxx - minx, h: maxy - miny }
-    : { x: 0, y: 0, w: 0, h: 0 }; // the space has no outline
-  return { adv: g.advanceWidth * (FS / font.unitsPerEm), bbox, contours: out };
-}
-
-const glyphs = {};
-for (const ch of CHARS) glyphs[ch] = glyphData(ch);
-
-const out = __dirname + '/glyphs.json';
-fs.writeFileSync(out, JSON.stringify({ em: FS, glyphs }));
-console.log('wrote', out, fs.statSync(out).size, 'bytes;', CHARS.length, 'glyphs:', CHARS.join(''));

assets/icons/build/generate.js

@@ -1,128 +0,0 @@
-'use strict';
-// Site icons + the Open Graph card for the public landing, drawn from the same
-// design as ../../vk (the wooden Erudit tile: face «Э», score «8») and the app's
-// board palette (ui/src/app.css). Everything is composed as SVG from the committed
-// glyph outlines (build/extract.js -> glyphs.json), so no font is needed at build
-// time; the PNG/ICO rasters are screenshots taken with the ui package's Playwright
-// chromium (@playwright/test re-exports the browser API). Outputs go straight to
-// ui/public/:
-//   favicon.svg          96 viewBox, transparent, tile + «Э» (the score is illegible small)
-//   favicon.ico          32x32 PNG-in-ICO render of the same
-//   apple-touch-icon.png 180x180 opaque full-bleed tile (iOS masks its own corners)
-//   og-image.png         1200x630 card: tile + wordmark on the board green
-const fs = require('fs');
-const path = require('path');
-
-const G = JSON.parse(fs.readFileSync(path.join(__dirname, 'glyphs.json'), 'utf8'));
-const UI = path.resolve(__dirname, '../../../ui');
-const OUT = path.join(UI, 'public');
-
-// ---- palette (vk loader tile + app.css board tokens) ------------------------
-const FACE = '#D9B978', BORDER = '#B49559', GLYPH = '#1A1A1A';
-const BOARD_DARK = '#2a3330', TEXT = '#e7ece8', TEXT_MUTED = '#cdd6cf';
-
-// ---- glyph outlines -> SVG path data ----------------------------------------
-const r2 = n => Math.round(n * 100) / 100;
-// pathD renders one glyph's contours scaled by sc and translated by (tx, ty).
-function pathD(g, sc, tx, ty) {
-  const pt = (v, d) => `${r2(v[0] * sc + tx + d[0] * sc)} ${r2(v[1] * sc + ty + d[1] * sc)}`;
-  const Z = [0, 0];
-  return g.contours.map(ct => {
-    const n = ct.v.length;
-    let d = `M${pt(ct.v[0], Z)}`;
-    for (let k = 1; k <= n; k++) {
-      const a = k - 1, b = k % n;
-      d += `C${pt(ct.v[a], ct.o[a])} ${pt(ct.v[b], ct.i[b])} ${pt(ct.v[b], Z)}`;
-    }
-    return d + 'Z';
-  }).join('');
-}
-// glyphAt centres a glyph's bbox at (cx, cy) with the given pixel cap height, the
-// same placement rule as the vk loader's glyph(). stroke fattens it slightly.
-function glyphAt(ch, capPx, cx, cy, stroke, colour) {
-  const g = G.glyphs[ch], sc = capPx / g.bbox.h;
-  const d = pathD(g, sc, cx - (g.bbox.x + g.bbox.w / 2) * sc, cy - (g.bbox.y + g.bbox.h / 2) * sc);
-  return `<path d="${d}" fill="${colour}" stroke="${colour}" stroke-width="${r2(stroke)}"/>`;
-}
-// textLine lays out a string on a baseline from the per-glyph advances; capPx sets
-// the capital height (measured on «Э»). Returns the combined path + the width.
-function textLine(str, capPx, x, y, colour) {
-  const sc = capPx / G.glyphs['Э'].bbox.h;
-  let d = '', w = 0;
-  for (const ch of str) {
-    const g = G.glyphs[ch];
-    if (g.contours.length) d += pathD(g, sc, x + w, y);
-    w += g.adv * sc;
-  }
-  return { svg: `<path d="${d}" fill="${colour}"/>`, width: w };
-}
-// tile draws the rounded wooden tile centred at (cx, cy): size px wide/high, with
-// the vk loader's corner (6/52) and rim proportions, «Э» and optionally the «8».
-function tile(cx, cy, size, withScore) {
-  const h = size / 2, rx = size * (6 / 52), rim = size * (1.8 / 52);
-  let s = `<rect x="${r2(cx - h + rim / 2)}" y="${r2(cy - h + rim / 2)}" width="${r2(size - rim)}" height="${r2(size - rim)}" rx="${r2(rx)}" fill="${FACE}" stroke="${BORDER}" stroke-width="${r2(rim)}"/>`;
-  s += glyphAt('Э', size * (32 / 52), cx, cy - size * (1 / 52), size * (1 / 52), GLYPH);
-  if (withScore) s += glyphAt('8', size * (8.5 / 52), cx + size * (19.5 / 52), cy + size * (18.5 / 52), size * (0.5 / 52), GLYPH);
-  return s;
-}
-const svg = (w, h, body) => `<svg xmlns="http://www.w3.org/2000/svg" width="${w}" height="${h}" viewBox="0 0 ${w} ${h}">${body}</svg>`;
-
-// ---- favicon.svg (the committed vector master) -------------------------------
-const favicon = svg(96, 96, tile(48, 48, 88, false)) + '\n';
-
-// ---- apple-touch-icon: opaque full bleed, iOS applies its own corner mask ----
-const appleTouch = svg(180, 180,
-  `<rect width="180" height="180" fill="${FACE}"/>` +
-  `<rect x="8" y="8" width="164" height="164" rx="18" fill="none" stroke="${BORDER}" stroke-width="4"/>` +
-  glyphAt('Э', 100, 90, 88, 3, GLYPH) +
-  glyphAt('8', 26, 146, 142, 1.5, GLYPH));
-
-// ---- og-image: tile + wordmark, centred as one group on the board green ------
-function ogImage() {
-  const W = 1200, H = 630, tileSize = 340, gap = 84;
-  const l1 = textLine('Эрудит', 112, 0, 0, TEXT);
-  const l2 = textLine('Скрэббл — игра в слова', 44, 0, 0, TEXT_MUTED);
-  const textW = Math.max(l1.width, l2.width);
-  const left = (W - (tileSize + gap + textW)) / 2;
-  const tx = left + tileSize + gap;
-  // Two baselines around the vertical centre; the tile centre sits between them.
-  const b1 = 295, b2 = 408;
-  const body =
-    `<rect width="${W}" height="${H}" fill="${BOARD_DARK}"/>` +
-    tile(left + tileSize / 2, H / 2, tileSize, true) +
-    textLine('Эрудит', 112, tx, b1, TEXT).svg +
-    textLine('Скрэббл — игра в слова', 44, tx, b2, TEXT_MUTED).svg;
-  console.log(`og-image: text ${Math.round(textW)}px wide, group left ${Math.round(left)}px`);
-  return svg(W, H, body);
-}
-
-// ---- rasterisation (Playwright chromium from ui/node_modules) ----------------
-async function shoot(page, markup, w, h, transparent) {
-  await page.setViewportSize({ width: w, height: h });
-  await page.setContent(`<body style="margin:0">${markup}</body>`);
-  return page.screenshot({ omitBackground: transparent });
-}
-// icoFromPNG wraps one PNG as a single-entry .ico (ICONDIR + ICONDIRENTRY + PNG).
-function icoFromPNG(png, sizePx) {
-  const h = Buffer.alloc(22);
-  h.writeUInt16LE(0, 0); h.writeUInt16LE(1, 2); h.writeUInt16LE(1, 4); // icon, 1 image
-  h.writeUInt8(sizePx, 6); h.writeUInt8(sizePx, 7);                    // 32x32
-  h.writeUInt16LE(1, 10); h.writeUInt16LE(32, 12);                     // planes, 32bpp
-  h.writeUInt32LE(png.length, 14); h.writeUInt32LE(22, 18);            // size, offset
-  return Buffer.concat([h, png]);
-}
-
-(async () => {
-  fs.writeFileSync(path.join(OUT, 'favicon.svg'), favicon);
-  const { chromium } = require(path.join(UI, 'node_modules', '@playwright/test'));
-  const browser = await chromium.launch();
-  const page = await browser.newPage();
-  const fav32 = await shoot(page, svg(32, 32, tile(16, 16, 29.33, false)), 32, 32, true);
-  fs.writeFileSync(path.join(OUT, 'favicon.ico'), icoFromPNG(fav32, 32));
-  fs.writeFileSync(path.join(OUT, 'apple-touch-icon.png'), await shoot(page, appleTouch, 180, 180, false));
-  fs.writeFileSync(path.join(OUT, 'og-image.png'), await shoot(page, ogImage(), 1200, 630, false));
-  await browser.close();
-  for (const f of ['favicon.svg', 'favicon.ico', 'apple-touch-icon.png', 'og-image.png']) {
-    console.log('wrote', path.join(OUT, f), fs.statSync(path.join(OUT, f)).size, 'bytes');
-  }
-})();

deploy/.env.example

@@ -115,6 +115,13 @@ TELEGRAM_MINIAPP_URL=                  # required; deploy derives it as PUBLIC_B
 TELEGRAM_TEST_ENV=false
 TELEGRAM_API_BASE_URL=
 
+# --- Client-version gate (ARCHITECTURE.md §2) -------------------------------
+# The hard minimum + the soft recommended client build. Empty ⇒ dormant. Plain (unprefixed) Gitea
+# variables, shared across contours; in the test contour the stamped client version is a commit hash
+# (unparseable ⇒ fail-open), so these only enforce on real semver prod builds. Recommended must be ≥ min.
+GATEWAY_MIN_CLIENT_VERSION=
+GATEWAY_RECOMMENDED_CLIENT_VERSION=
+
 # --- VK Mini App ------------------------------------------------------------
 # The VK app's "protected key" (client_secret): the gateway verifies the Mini App
 # launch-parameter signature in-process under it (a pure offline HMAC, no VK API call).

deploy/README.md

@@ -118,6 +118,8 @@ without it Docker's resolver handles `otelcol`, `gateway` and `api.telegram.org`
 | `GATEWAY_BLOCKLIST_ENABLED` | variable | `false` | Enable the community IP blocklist at the edge (prod-only, same real-client-IP reason as the ban). Requires `GATEWAY_BLOCKLIST_URL`. Opt-in via `PROD_GATEWAY_BLOCKLIST_ENABLED` after verifying the feed. |
 | `GATEWAY_BLOCKLIST_URL` | variable | _(empty)_ | The curated CIDR feed to fetch (Spamhaus DROP). Required when enabled; refreshed every few hours and dropped fail-open once stale (48h). `PROD_GATEWAY_BLOCKLIST_URL`. |
 | `GATEWAY_BLOCKLIST_ALLOW` | variable | _(empty)_ | Comma-separated never-block set (CIDRs / bare IPs — own infra, monitoring) the feed can never block. `PROD_GATEWAY_BLOCKLIST_ALLOW`. |
+| `GATEWAY_MIN_CLIENT_VERSION` | variable | _(empty)_ | **Hard** tier of the client-version gate (ARCHITECTURE.md §2). Minimum client build the gateway will serve. Empty ⇒ **dormant** (every build served, the web default). Set it to the release `vMAJOR.MINOR.PATCH` in the **same** rollout that ships an incompatible wire change, so an older bundled APK is turned away with an *update required* signal instead of failing blind — the client then degrades to an offline "Update / Play offline" notice, not a hard lockout. Validated at load; a non-empty unparseable value fails startup. |
+| `GATEWAY_RECOMMENDED_CLIENT_VERSION` | variable | _(empty)_ | **Soft** tier of the client-version gate (ARCHITECTURE.md §2). A build at or above `GATEWAY_MIN_CLIENT_VERSION` but **below** this is served normally, but every gated `Execute` response carries an additive `X-Update-Recommended: 1` header ⇒ the client shows a dismissable *update available* nudge (play continues). Empty ⇒ off. Validated at load: unparseable, or **below** `GATEWAY_MIN_CLIENT_VERSION`, fails startup. Bump it (ahead of `MIN`) to nudge upgrades before a hard cut-over. |
 | `VITE_GATEWAY_URL` | variable | _(empty)_ | UI build-arg: gateway origin; empty = same-origin (the usual single-origin deploy). |
 | `SMTP_RELAY_HOST` | variable (shared) | _(empty)_ | Selectel SMTP relay host for confirm-code email. Empty leaves the backend on the log mailer (email disabled) — the contour still boots. One relay for every contour (limit 100 msgs / 5 min). |
 | `SMTP_RELAY_PORT` | variable (shared) | `465` | Relay port. No client certificate is needed (the server cert is validated against the system roots). |
@@ -236,6 +238,32 @@ redeploy the matching old tag. This dump is a belt-and-braces net for a bad migr
 **point-in-time recovery** (below) is the primary recovery path once armed, and the only one
 that survives losing the host.
 
+## Android app build & release (RuStore)
+
+The standalone Android app is built by a **manual** workflow, never automatically, and is separate from the
+web/prod rollout — a signed APK uploaded to RuStore by hand. The build/release runbook follows.
+
+- **Trigger:** `Actions → android-build → Run workflow` from **`master`**, input `confirm=build` (mirrors
+  `prod-deploy`). **Tag the release first** (`git tag vX.Y.Z` on `master`) — the workflow refuses anything
+  but a clean `vMAJOR.MINOR.PATCH` and derives `versionCode = MA*1_000_000 + MI*1_000 + PA`,
+  `versionName = MA.MI.PA`. Watch it green with `python3 ~/.claude/bin/gitea-ci-watch.py`.
+- **Output:** a `release APK` run artifact — **signed** when the signing secrets are present, an
+  **unsigned** release APK otherwise (a dry run still proves the pipeline).
+- **Runner (host-executor):** JDK 21 comes from `setup-java`; the **Android SDK is host-provisioned** —
+  install it once (`sdkmanager 'platform-tools' 'platforms;android-36' 'build-tools;36.0.0'`) and grant the
+  `runner` user read+exec (`sudo chmod -R a+rX /opt/android-sdk`). Override the path with the
+  `ANDROID_SDK_DIR` variable. The workflow's `Verify the host Android SDK` step fails fast with the fix if
+  the SDK is missing or unreadable.
+- **Release keystore** (create once, **back up off-host** — losing it means the app can never be updated):
+  `keytool -genkeypair -v -keystore erudit-release.jks -alias erudit -keyalg RSA -keysize 4096 -validity 10000`,
+  then set the Gitea **secrets** `ANDROID_KEYSTORE_BASE64` (`base64 -w0 erudit-release.jks`),
+  `ANDROID_KEYSTORE_PASSWORD`, `ANDROID_KEY_ALIAS`, `ANDROID_KEY_PASSWORD`. Set the `ANDROID_RUSTORE_URL`
+  variable to the store listing once published (empty until then — the in-app update button no-ops).
+- **Wire-break discipline:** the prod deploy that ships an incompatible wire change **also** bumps
+  `GATEWAY_MIN_CLIENT_VERSION` to that release (see Optional variables), so an old installed APK is turned
+  away cleanly instead of failing blind.
+- **Upload:** download the artifact and upload it to RuStore by hand (no automated RuStore-API upload in the MVP).
+
 ## Point-in-time recovery (PITR)
 
 The main host archives Postgres continuously with **pgBackRest** to **Selectel S3**

deploy/caddy/Caddyfile

@@ -107,12 +107,13 @@
 		}
 	}
 
-	# The public offer page is rendered by the render sidecar: it splices the live catalog price
+	# The public legal pages are rendered by the render sidecar: the offer (with the live catalog
-	# list (backend, internal) into the committed ui/legal/offer_ru.md and returns the HTML. Only
+	# price list from the backend spliced into ui/legal/offer_ru.md), the privacy policy and the EULA
-	# /offer/ is exposed here — the sidecar's /render stays off this allow-list, internal-only. Kept
+	# (both static markdown). Only these paths are exposed here — the sidecar's /render stays off this
-	# disjoint from the landing/app paths so the catch-all below never shadows it.
+	# allow-list, internal-only. Kept disjoint from the landing/app paths so the catch-all below never
-	@offer path /offer /offer/*
+	# shadows them.
-	handle @offer {
+	@legal path /offer /offer/* /privacy /privacy/* /eula /eula/*
+	handle @legal {
 		reverse_proxy renderer:8090
 	}
 

deploy/docker-compose.yml

@@ -222,6 +222,12 @@ services:
       GATEWAY_HTTP_ADDR: ":8081"
       GATEWAY_BACKEND_HTTP_URL: http://backend:8080
       GATEWAY_BACKEND_GRPC_ADDR: backend:9090
+      # Client-version gate (ARCHITECTURE.md §2): the hard minimum + the soft recommended client build.
+      # Empty ⇒ dormant. Plain (unprefixed) — the same value serves every contour; in the test contour
+      # the stamped client version is a commit hash (unparseable ⇒ fail-open), so the gate only bites
+      # real semver builds in prod. Validated at gateway start (recommended must be ≥ min).
+      GATEWAY_MIN_CLIENT_VERSION: ${GATEWAY_MIN_CLIENT_VERSION:-}
+      GATEWAY_RECOMMENDED_CLIENT_VERSION: ${GATEWAY_RECOMMENDED_CLIENT_VERSION:-}
       # Telegram auth validates against the home validator (plaintext, internal).
       GATEWAY_VALIDATOR_ADDR: validator:9091
       # VK Mini App auth verifies the launch-parameter signature in-process under the VK

deploy/write-prod-env.sh

@@ -49,6 +49,8 @@ export CADDY_SITE_ADDRESS='$CADDY_SITE_ADDRESS'
 export LOG_LEVEL='${LOG_LEVEL:-info}'
 export DICT_VERSION='$DICT_VERSION'
 export APP_VERSION='$APP_VERSION'
+export GATEWAY_MIN_CLIENT_VERSION='$GATEWAY_MIN_CLIENT_VERSION'
+export GATEWAY_RECOMMENDED_CLIENT_VERSION='$GATEWAY_RECOMMENDED_CLIENT_VERSION'
 export TELEGRAM_BOT_TOKEN='$TELEGRAM_BOT_TOKEN'
 export TELEGRAM_MINIAPP_URL='$TELEGRAM_MINIAPP_URL'
 export GATEWAY_VK_APP_SECRET='$GATEWAY_VK_APP_SECRET'

docs/ARCHITECTURE.md

@@ -100,15 +100,26 @@ dropped). Horizontal scaling is explicit future work.
   auth operations are unauthenticated and return the minted token. A unary
   operation's domain outcome rides back in `ExecuteResponse.result_code` (HTTP
   200); only edge failures (rate limit, missing session, unknown type, internal)
-  surface as Connect error codes. The client treats a connectivity edge failure as
+  surface as Connect error codes. The client treats connectivity as **state, not a per-call toast**,
-  **state, not a per-call toast**: a transport `unavailable` or a `rate_limited` flips a global
+  via a single **net-state machine** — a pure reducer (`ui/src/lib/netstate.ts`) behind a reactive
-  `online` signal that drives a header **"Connecting…"** spinner and softly disables proactive
+  store (`netstate.svelte.ts`); `connection`/`offline` are thin derived shims over it. It has four
-  actions, and the transport **auto-retries with capped exponential backoff** — every op on a
+  states: `online`; `connecting` (a call or probe is failing but still inside the anti-flap window —
-  rate-limit (the gateway rejected it before processing, so it is safe), but only **read-only**
+  the header **"Connecting…"** spinner, chrome stays online); `offlineNoNetwork` (sustained loss — blue
-  ops on `unavailable` (a mutation is never blindly re-sent, to avoid double-applying one whose
+  chrome, a local-only lobby, the transport **kill switch**); and `offlineVersionLocked` (the gateway is
-  response was lost — its button is disabled while offline and the player re-issues it on
+  reachable but the build is below the hard minimum — the *update* notice, the client-version gate below). **Offline is
-  reconnect). A reachability watcher (a lightweight `profile.get` probe) clears the signal when no
+  implicit** — detected from failed calls, a reachability probe and the OS hint (`navigator` /
-  other traffic is in flight; the live `Subscribe` stream's drop/recovery feeds the same signal.
+  `@capacitor/network`), **never a user toggle** — with **hysteresis** so a brief blip lives entirely in
+  `connecting` (K consecutive probe failures *or* a debounce window trips `offlineNoNetwork`; the first
+  probe/call success heals back, with a toast). The transport **auto-retries with capped exponential
+  backoff** — every op on a rate-limit (the gateway rejected it before processing, so it is safe), but
+  only **read-only** ops on `unavailable` (a mutation is never blindly re-sent, to avoid double-applying
+  one whose response was lost — its button is disabled while offline and re-issued on reconnect). A
+  reachability watcher (a lightweight `profile.get` probe; a session-less native guest reconciles a
+  server guest instead — that reconcile IS the probe) drives recovery, and the live `Subscribe` stream's
+  drop/recovery feeds the same machine. **Telegram/VK are exempt** — always online: they are never fed an
+  offline signal, and `offlineMode.active` is additionally hard-gated on `offlineCapable()` (false in
+  those mini-apps), so nothing — not even a version lock — puts them in offline mode: no blue chrome, no
+  local lobby, no transport kill switch and no device-local create paths.
   **Edge hardening:** every request body on the public listener is capped at
   `GATEWAY_MAX_BODY_BYTES` (default 1 MiB — far above any legitimate payload), both at the HTTP
   layer (`http.MaxBytesReader`) and as the Connect per-message read limit, so an oversized
@@ -140,6 +151,40 @@ dropped). Horizontal scaling is explicit future work.
   (your-turn, opponent-moved, chat, nudge). The gateway bridges them to the
   client's in-app stream while the app is open. Out-of-app delivery uses
   platform-native push via the platform side-service.
+- **Client-version gate — two tiers** (native long-tail protection): a bundled native install (§13) can be
+  arbitrarily old, so the client stamps its build into an **`X-Client-Version`** request header (the app
+  version from `pkg/version` / `__APP_VERSION__`), read by the gateway **before it decodes the FlatBuffers
+  payload**. The version rides the **outermost stable layer** — an HTTP header, never the FBS payload —
+  because protobuf envelopes and headers are version-tolerant by design while the FBS payload is the layer
+  that breaks. Enforcement is **per-call, not a Hello RPC** (`Execute`/`Subscribe` check it at the top,
+  before registry lookup / auth / decode), so the first online call is already gated. Both tiers **fail
+  open** (an absent or unparseable header passes) and are **dormant** until deliberately configured (both
+  vars empty ⇒ off, web behaviour unchanged).
+  - **Hard (critical) — `GATEWAY_MIN_CLIENT_VERSION`**: `version < min` ⇒ the domain envelope
+    `result_code = "update_required"` (HTTP 200) on `Execute` and `CodeFailedPrecondition` on `Subscribe`;
+    the client makes **zero** successful requests. Its reaction is **graceful, not terminal**: it enters
+    `offlineVersionLocked` (offline mode) and shows a **dismissable notice** — **"Update"** (native → the
+    store listing `VITE_RUSTORE_URL`, web → reload) or **"Play offline"** (dismiss → keep playing local
+    vs_ai / hotseat). The lock is sticky until an actual update on the next launch.
+  - **Soft (recommended) — `GATEWAY_RECOMMENDED_CLIENT_VERSION`**: `min ≤ version < recommended` ⇒ the
+    gateway sets an **additive** `X-Update-Recommended: 1` **response header** on the served `Execute`
+    response (the call still succeeds); a transport interceptor turns it into a **dismissable "update
+    available" nudge** in the lobby — play continues, nothing blocks. `recommended` must be **≥ `min`**
+    (validated at config load); empty ⇒ the soft tier is off.
+- **Frozen wire contract** (so any build, however old, can always recognise "update required"): three
+  things are permanent — (1) the protobuf envelope field numbers in `edge.proto` are never renumbered or
+  reused; (2) the `update_required` sentinel — the `result_code` string **and** the `FailedPrecondition`
+  code — never changes; (3) the FBS schema stays **additive** (append trailing fields; `(deprecated)`, never
+  delete — deleting shifts field IDs and breaks older readers). A breaking wire change happens only *inside*
+  the FBS payload, which is exactly what the gate guards. **Deploy discipline:** the production rollout that
+  ships an incompatible wire change **also** bumps `GATEWAY_MIN_CLIENT_VERSION` to that release, in the same
+  rollout (see [`../deploy/README.md`](../deploy/README.md)).
+- **Gate × offline** (UX rule): offline is the net-state machine's `offlineNoNetwork` / `offlineVersionLocked`
+  (implicit — no toggle) and its kill switch refuses calls, so the hard gate never fires *while already
+  offline* — an old install always plays local vs_ai / hotseat. A hard `update_required` on a
+  **user-initiated online call** degrades to `offlineVersionLocked` + the dismissable notice (above); the
+  silent background guest reconciliation (§3) **swallows** an `update_required` and stays a local guest
+  rather than interrupting local play.
 
 ## 3. Authentication & sessions
 
@@ -224,6 +269,19 @@ arrive from a platform rather than completing a mandatory registration).
   `BACKEND_GUEST_REAP_INTERVAL` sweep, so transient guest rows do not accumulate.
   Platform and email users are auto-provisioned **durable** accounts with an
   identity.
+- **Local guest vs. server guest** (native offline-first, §13). The **native** app splits the local-play
+  identity from the server account. A **local guest** is device-local with **no DB row**: a device-generated
+  id + the localized default name (*Guest* / *Гость*) persisted on the device, existing from the very first
+  launch with no network. It fills the human seat in a local vs_ai game and is the "you" for device-local
+  games; a purely-offline user never consumes a server row. The **server guest** is the durable `is_guest`
+  row above — minted **lazily** via `auth.guest` the first time the app reaches the network, its session
+  cached and reused (exactly one per device, guarded by the cached session so it never double-mints). It
+  unlocks online features (matchmaking, friends). **Reconciliation:** on gaining network with no server
+  session the native app silently `auth.guest`s in the background and adopts it — best-effort, swallowing an
+  `update_required` to stay a local guest rather than interrupting play (the gate × offline rule, §2).
+  **Local games stay device-only** (both local vs_ai and hotseat persist only on the device); an identity
+  transition never migrates them. Web/PWA/Telegram/VK are unchanged — they have no local guest and keep the
+  prior online-session rule.
 
 > **Decision (2026-06-20) — single bot, preference-based variant gating.** The former
 > two-bot model (one bot per service language, with `accounts.service_language`, a
@@ -909,10 +967,14 @@ finished journal on each GET. The only degraded platform is a legacy Telegram cl
 predating `downloadFile`, where the GCG falls back to the old clipboard copy and the
 image option is not offered.
 
-The same sidecar also serves the **public offer page** at `/offer/` — the one edge-exposed
+The same sidecar also serves the **public legal pages** — the offer at `/offer/`, the privacy
-route on it (caddy routes `/offer/` here; its `/render` stays internal). It reuses the shared
+policy at `/privacy/` and the EULA at `/eula/` — the edge-exposed routes on it (caddy routes them
-`ui/src/lib/offer.ts` renderer (again one renderer, no drift) over the owner-edited
+here; its `/render` stays internal). All three reuse the shared `ui/src/lib/offer.ts`
-`ui/legal/offer_ru.md`, baked into the image, splicing in the **live price list** (§4.4): it
+`renderLegalHtml` (one renderer, no drift) over their owner-edited `ui/legal/*_{ru,en}.md` — each is
+**bilingual (RU + EN)** with a client-side language + theme switcher (default Russian, persisted;
+the offer's EN view transliterates the Russian product names) — baked into the image. `/privacy/`
+and `/eula/` are static; the offer additionally splices in the **live price list** (§4.4) into both
+languages: it
 fetches the two catalog tables as markdown from the backend's internal
 `/api/v1/internal/offer/pricing` at the `<#pricing_template#>` marker, then renders the page. The
 backend projects the tables from the active catalog through `payments.Money` (no float reaches the
@@ -1307,7 +1369,9 @@ Single public origin, path-routed. The Vite build has two entries: a lightweight
 `/app/` (web), `/telegram/` (the Telegram Mini App; on that path without sign-in data
 — no `initData` — the client renders a compact, shareable launch-diagnostic screen instead
 of redirecting away) and `/vk/` (the VK Mini App; the client reads the signed `vk_*` launch
-parameters from the URL and the gateway verifies them in-process — §12); a stray hit on the
+parameters from the URL and the gateway verifies them in-process — §12; on that path without a
+signed launch the client renders the same shareable launch-diagnostic screen rather than starting
+a throwaway guest); a stray hit on the
 gateway's `/` 308-redirects to `/app/`. The **landing** ships in its own static container: the
 `landing` target of `gateway/Dockerfile` (caddy:2-alpine + the same Vite build,
 `deploy/landing/Caddyfile`) serves it at `/`, so stray public traffic is absorbed by
@@ -1332,13 +1396,18 @@ route (its `directoryIndex` is `index.html`) would otherwise shadow it and serve
 cache-first — the old build's version until a second load. The landing page and the conditional
 polyfill bundle are excluded, and the Connect stream and runtime API POSTs are never precached nor
 intercepted, so the live app is never served stale. This satisfies Chromium's installability requirement (a registered SW, needed
-for install on Android) and powers the opt-in **offline mode** (in progress): a deliberate, device-scoped Settings
+for install on Android) and powers **offline play**. Offline is **implicit** — the net-state machine
-toggle — distinct from the transient gateway-reachability signal — that tints the header blue with
+(§2) detects lost connectivity and tints the header blue with an *Offline* chip; there is **no toggle**
-an *Offline* chip and confines play to on-device `vs_ai` games. The **offline lobby lists only those
+(the old deliberate Settings switch and its cold-start dialog are gone). The **unified lobby** merges the
-device-local games** (reconstructed by replaying the IndexedDB move journal) and its New-vs-AI entry
+device-local games (active — reconstructed by replaying the IndexedDB move journal) with the last-cached
-creates one through the in-browser engine — the same game screen then drives it, the robot replying
+**server games shown greyed** (un-openable, a tap toasts *offline*); the Stats tab is disabled and
-locally; online-only affordances (the Stats tab, the random-opponent option) are disabled
+invitations are hidden while offline. On offline-capable channels (native / plain web) New Game's *with
-or hidden, and New Game's *with friends* becomes the entry to **local pass-and-play (hotseat)**.
+friends* carries an **online/offline segmented control** — online = a friend invite, offline = **local
+pass-and-play (hotseat)** — with the online segment disabled and offline forced when there is no network;
+the online-only Telegram/VK mini-apps skip the segment and show the remote invite alone. A `vs_ai` or
+hotseat create is guarded when
+the chosen variant's dictionary is not available offline. A device-local `vs_ai` game is created through
+the in-browser engine and driven by the same game screen, the robot replying locally.
 A hotseat game is a device-local **2-4 human** game built through the same engine (`hotseat` +
 per-seat/host PIN locks on the record; the seats carry names but no accounts). A **mandatory host
 (referee) PIN** gates the roster at creation and, in-game, the referee overrides — **skip** the
@@ -1366,36 +1435,27 @@ eligible installed PWA (standalone web + confirmed email) **background-preloads*
 — on lobby entry and on a variant-preference change — through the same three-tier loader, retried
 with backoff and honouring the session miss-breaker; the move generator, the loader and the preload
 orchestration stay in lazy chunks. A first-lobby preload failure shows a *poor-connection* notice in
-the ad-banner slot. Flipping the Settings toggle **to** offline runs that same cache-first fetch
+the ad-banner slot. A **cold launch with no network** boots offline-first from the persisted session +
-bounded by a ~5 s UI wait (`raceOfflineReady` + the lazy `dict/offlineready`): it enters offline only
+profile (saved on every online adopt/refresh) — `bootstrap` skips the session adoption and profile fetch
-once every enabled variant is ready, otherwise it stays online with a *needs internet* note while the
+that would otherwise hang, and lands straight in the offline lobby; a native launch with no server
-fetch finishes in the background (the next flip is then instant). A **cold launch already in offline
+session enters as a device-local guest (§3), and any stale pre-redesign offline-preference key is cleared
-mode** boots from the persisted session and
+on boot. Connectivity is **detected, not chosen** (the net-state machine, §2): a cold `navigator.onLine
-profile (the profile is saved on every online adopt/refresh) — `bootstrap` skips the session
+=== false` or a failed cold reachability probe (a bounded `profile.get`) enters offline, and mid-session
-adoption and profile fetch that would otherwise hang with no network, and lands straight in the
+the `navigator` / `@capacitor/network` `online`/`offline` events plus the probe watcher drive it — with
-offline lobby; without a cached profile (an install that was never online) it drops the sticky flag
+**hysteresis** so a brief blip lives in `connecting` and never flips the chrome, and **self-heal** (a
-and boots online instead. Beyond the sticky toggle the app **auto-detects connectivity**: the
+back-online toast) when the network returns. Offline is a real **transport kill switch** (every gateway
-reactive flag carries an *auto* bit, so a self-entered offline (no network) is transient
+call is refused, so no traffic leaks); the reachability probe is the one call exempt from it (it is the
-(session-only, never persisted) and self-heals to online when the network returns, while a deliberate
+return-to-online mechanism). The gateway registers the `.webmanifest` MIME type
-one (the toggle, or the cold-start dialog's *Switch*) persists. At cold start `navigator.onLine ===
-false` enters offline for the session; otherwise a single bounded reachability probe (a `profile.get`,
-~3 s) decides — success boots online, a timeout on an eligible install raises a *No connection* dialog
-(*Switch* = sticky offline, *Wait for network* = boot online with the reachability watcher retrying).
-Mid-session the `window` `online`/`offline` events drive it — `offline` auto-enters, `online`
-re-verifies reachability before returning — backed by a `navigator.onLine` poll because those events
-are unreliable on some platforms (notably iOS PWAs). Offline is a real **transport kill switch**
-(every gateway call is refused, so no traffic leaks); the reachability probe is the one call exempt
-from it (it is the return-to-online mechanism), and the transient reachability watcher is suppressed
-while offline. The gateway registers the `.webmanifest` MIME type
 in-process (the distroless image has no `/etc/mime.types`). Hash-named `/assets/*` are served
 `immutable` (a relaunch is a cache hit, not a re-download); the HTML shells are
 `no-cache` so a new deploy is picked up — both containers apply the same caching. An
 in-compose **caddy** is the contour's edge: it owns a single `/_gm` Basic-Auth and
 routes `/_gm/grafana/*` to **Grafana** (anonymous-admin, so the one shared login gates
 it with no per-user Grafana accounts) and the rest of `/_gm/*` to the backend-rendered
-**admin console**; `/app/`, `/telegram/`, `/vk/` and the Connect path go to the gateway; `/offer/`
+**admin console**; `/app/`, `/telegram/`, `/vk/` and the Connect path go to the gateway; the public
-(the public offer, rendered by the `renderer` sidecar with the live catalog price list spliced in)
+legal pages `/offer/`, `/privacy/` and `/eula/` (rendered by the `renderer` sidecar — the offer with
-goes to the render sidecar; and the catch-all — notably the landing at `/` — goes to the landing
+the live catalog price list spliced in) go to the render sidecar; and the catch-all — notably the
+landing at `/` — goes to the landing
 container. The
 **Telegram validator** runs as a separate container with **no public ingress**,
 answering only internal gRPC (HMAC, no Telegram egress). The **Telegram bot** holds
@@ -1468,6 +1528,24 @@ Two contours, two secret/variable prefixes (`TEST_` / `PROD_`):
   client IPs). The `vpn`+`bot` pair is gated to a `telegram-local` compose profile the test
   contour activates; the prod main host omits it.
 
+**Native Android build (Capacitor).** The SPA is also packaged as a standalone **Android app** (Capacitor 8,
+appId `ru.eruditgame.app`, "Эрудит"; minSdk 24, compile/targetSdk 36, JDK 21), first for **RuStore**. It is
+a **bundle** model — the WebView loads the packaged `dist/` from app assets (**no `server.url`**), so there
+is no OTA: updates ship through the store, and the **client-version gate** (§2) turns away a build too old to
+speak the current wire contract. Because the packaged origin is `file://`, the native build talks to an
+**absolute** gateway origin (`VITE_GATEWAY_URL` = the production origin; `lib/origin.ts` centralises how absolute URLs are built), and the service worker is skipped (the bundle is
+the cache). It is **offline-first**:
+`ui/scripts/bundle-dicts.mjs` copies the versioned `scrabble-dictionary` release DAWGs into
+`dist/dict/<variant>@<version>.dawg` (keyed on `VITE_DICT_VERSION`), so a cold first launch with no network
+enters as a **local guest** (§3) and plays local vs_ai / hotseat from the bundled dictionaries. Purchases are
+hidden in the MVP (`VITE_PAYMENTS_DISABLED`). The APK is built by a **manual** `workflow_dispatch` workflow
+(`.gitea/workflows/android-build.yaml`, from `master`, `confirm=build`) that builds the native SPA, bundles
+the dicts, and assembles a **release APK** artifact — signed when the `ANDROID_KEYSTORE_*` secrets are
+present, unsigned otherwise. `versionCode`/`versionName` are deterministic from the release tag `vMA.MI.PA`
+(`versionCode = MA*1_000_000 + MI*1_000 + PA`, `versionName = "MA.MI.PA"`). The runner is a host-executor
+with a host-provisioned Android SDK; RuStore upload is manual. Runbook:
+[`../deploy/README.md`](../deploy/README.md).
+
 ## 14. CI & branches
 
 - **Two long-lived branches**: **`development`** is the integration

docs/FUNCTIONAL.md

@@ -30,11 +30,13 @@ render with arbitrary languages, so detection would make the indexed content
 nondeterministic); a saved 🌐 choice still wins. The page carries a static Russian SEO head
 (title/description, the Open Graph card Telegram/VK link previews use, a canonical link
 pinned to the production origin, JSON-LD, the favicon set and `robots.txt`), while the SPA
-shell is `noindex` — the landing is the only indexable page. The footer links to the **public
+shell is `noindex` — the landing is the only indexable page. The footer links to the three **legal
-offer** (`/offer/`) and, beside it, **feedback** — the Telegram bot the offer names as the seller's
+documents** — the **user agreement** (`/eula/`), the **privacy policy** (`/privacy/`) and the
-contact. The offer page (the legal document a purchase accepts) is rendered on demand from
+**public offer** (`/offer/`) — and, beside them, **feedback** (the Telegram bot the documents name as
-`ui/legal/offer_ru.md` with its **price list** (§4.4) generated from the live product catalog, so
+the seller's contact). Each is **bilingual (RU/EN)** with a language + theme switcher and is rendered
-the published prices always match what is currently on sale — no redeploy to update them.
+from its `ui/legal/*_{ru,en}.md` sources by the render sidecar; the offer additionally splices in its
+**price list** (§4.4) generated from the live product catalog, so the published prices always match
+what is currently on sale — no redeploy to update them.
 
 On the plain web the client is an **installable PWA**: a logged-out player sees an install
 call-to-action under the login form (and at the bottom of Settings) that installs the app to the
@@ -70,7 +72,10 @@ A **VK Mini App** launch works the same way: it authenticates from VK's signed l
 `vk_language` and its display name from the VK profile (read on the client, since VK does not put
 the name in the signed launch). While the theme preference is "auto" the app follows the VK
 client's light/dark scheme, and the layout clears the VK mobile home bar. The same quiet-retry
-"couldn't load" screen applies inside VK.
+"couldn't load" screen applies inside VK. Opening a Mini App link directly in an ordinary browser —
+the `/vk/` entry with no signed VK launch, or `/telegram/` with no Telegram sign-in data — shows a
+compact, shareable diagnostic screen instead of proceeding (as a throwaway guest on VK, or by
+redirecting away on Telegram), so a player who ends up there wrongly can screenshot it for us.
 **Email** sign-in (web) mails a branded six-digit confirmation code — localized
 (en/ru), no images — to the address; entering it signs the player in. A new address
 is provisioned on the first request but only becomes a durable account once the code
@@ -277,22 +282,28 @@ add-friend are off. AI games are **practice** — they never count toward a play
 statistics.
 
 ### Offline mode
-An installed web PWA signed in with a confirmed email can switch to a deliberate **offline mode**
+The **web and native apps** play **offline automatically** — there is **no on/off switch**; the
-(Settings → Play mode). Offline, the app never touches the network: the header turns blue with an
+online-only **Telegram and VK mini-apps** never go offline (everything below applies to the web and
-*Offline* chip, the lobby lists only the games stored on the device, and online-only surfaces are
+native apps only). When it cannot reach the
-disabled or hidden (the Stats tab; the *random opponent* option in New Game).
+server the header turns blue with an *Offline* chip and play is confined to games on the device; a
-A New Game against the robot creates a device-local **vs_ai** game — it
+momentary blip is ridden out as a quiet *"Connecting…"* (it never drops you offline), and when the
-plays entirely in the browser with no backend. Local games are kept on the device, visible only in
+connection returns the app goes back online on its own with a brief *back online* toast. Offline, the
-offline mode, and never sync to the account. So a game can be created and played with no connection,
+app never touches the network.
-the app quietly preloads the dictionaries for the player's enabled variants while still online, and
-(once installed) launches from a precached shell even with no network. Switching **to** offline first
-checks that the enabled variants' dictionaries are on the device — if any are missing it fetches them
-and waits briefly, and if they cannot be readied it stays online with a short *needs internet* note
-(the download keeps running in the background, so a later switch is instant). The mode is
-device-scoped and sticky across launches.
 
-Offline, New Game's **with friends** starts a **local pass-and-play** game for 2-4 people sharing one
+The **lobby stays unified**: your device-local games are active, while your server games are still
-device. You first set a **host (leader) password** — a 4-digit PIN entered on a lock-screen-style
+listed but **greyed out** — visible but un-openable until you are back online (a tap explains why).
+Online-only surfaces (the Stats tab) are disabled and invitations are hidden while offline. A New Game
+against the robot creates a device-local **vs_ai** game that plays entirely on the device with no
+backend; local games are kept on the device and never sync to the account, so a game can be created and
+played with no connection. The app quietly preloads the dictionaries for the player's enabled variants
+while still online, and (once installed, or on the native app) launches from bundled/precached data even
+with no network; if a variant's dictionary is not available offline, creating that game is disabled with
+a short note.
+
+New Game's **with friends** offers a choice — **invite a friend** to play online, or a **local
+pass-and-play** game for 2-4 people sharing one device; with no network only pass-and-play is available.
+(In the online-only Telegram/VK mini-apps *with friends* is the friend invite alone — no pass-and-play.)
+In pass-and-play you first set a **host (leader) password** — a 4-digit PIN entered on a lock-screen-style
 keypad; until it is set the player rows stay locked. The app then asks whether you are playing too —
 if so you take the first seat with your profile name. You name each player (2 to 4; add or remove
 rows, where a removal asks for the leader password) and may give any seat its **own optional PIN**.
@@ -305,14 +316,31 @@ pass-and-play game. A game that finishes normally is saved to the offline lobby
 deleting any pass-and-play game — running or finished — from the lobby asks for the leader password,
 so no one can wipe a game the moment they have moved.
 
-The app also **enters offline mode on its own** when it cannot reach the network. On a cold launch
+Going offline and coming back are both **automatic**. On a cold launch with no connection the app
-with no connection it switches to offline for that session; when the device is online but the gateway
+starts straight in the offline lobby; while it is open, losing the network — airplane mode — turns it
-stays silent for a few seconds it asks first — *No connection. Switch to offline mode?*, with
+offline on its own, and restoring the network returns it online by itself. There is no dialog and no
-**Switch** (go offline) or **Wait for network** (keep retrying online). While the app is open, losing
+switch to remember: a brief drop is ridden out quietly and only a sustained loss turns the chrome
-the network — airplane mode — switches to offline automatically, and restoring it returns online by
+offline, so you are never interrupted for a hiccup.
-itself. A self-entered offline is temporary: it reverts to online the moment the network is back, and
+
-the next launch re-checks. A **deliberate** offline — the Settings toggle, or **Switch** in that
+### Staying up to date
-dialog — is the player's choice: it is kept, and never undone automatically.
+When a new client version is required, the app does not lock you out. On the **native** app a
+too-old build shows a notice with **Update** (opens the store) and **Play offline** (dismiss and keep
+playing your on-device games); on the web it offers **Update** (reload) instead. A softer,
+non-blocking **"update available"** banner appears in the lobby when a newer — but not yet
+required — version exists; you can update or dismiss it, and play continues either way.
+
+### Native app (Android)
+The game also ships as a standalone **Android app** (first on **RuStore**), a packaged build of the same
+client. Everything it needs is bundled, so it opens with **no network**: a first launch offline drops you
+straight into the lobby as a **guest** (no sign-in wall) and you can play right away — against the robot, or
+a **pass-and-play** game with friends on one device — using the dictionaries shipped inside the app. When the
+network is available the app quietly establishes a guest in the background and online features (random
+opponents, friends, statistics) light up without interrupting play; local games you started offline stay on
+the device. To keep a durable account you sign in with **email** from Profile (the guest becomes your
+account); Telegram and VK sign-in are not offered in the native app. In-app purchases are hidden in this
+first release. Because an installed app can be far older than the server, a build that is **too old** to talk
+to the current server shows a single, non-dismissable *update* screen whose button opens the store listing —
+this appears only on an online action, never while you are playing offline.
 
 ### Social: friends, block, chat, nudge
 Become friends in two ways: redeem a **one-time code** the other player issues (six
@@ -407,9 +435,11 @@ unanswered reply. Guests cannot send feedback (the entry is hidden). A player th
 barred from feedback (a role, not a full account block) sees the send control disabled.
 
 ### Telegram support chat
-A user can also reach the operators straight from the Telegram bot: anything they send the bot
+A user can also reach the operators straight from the Telegram bot. The `/support` command replies
-other than `/start` — text, a photo, a voice message, a file — is forwarded into the operators'
+with the support desk's working hours and what to include (a description and, when possible,
-private support group, grouped into a per-user thread. The user sees no automatic reply; an
+screenshots). Anything else they send the bot other than `/start` — text, a photo, a voice message,
+a file — is forwarded into the operators' private support group, grouped into a per-user thread. The
+user sees no automatic reply to a forwarded message; an
 operator answers from that thread and the bot delivers the answer back as an ordinary bot message,
 so to the user it is a quiet one-to-one conversation. Operators can block a user (the bot then
 silently ignores their messages) or clear a thread's messages. This is independent of the in-app
@@ -512,7 +542,8 @@ at any time (games already lost stay lost).
 
 Where the bot manages a channel's **linked discussion chat**, everyone may write by default and the
 bot **mutes** a player who is **not registered** or is **blocked**, un-muting them once they register
-or are unblocked. So an unregistered newcomer who comments is muted (the promo bot points them at the
+or are unblocked. It also clears the automatic pin Telegram puts on each channel post that is
+auto-forwarded into the chat, so only deliberately pinned messages stay pinned. So an unregistered newcomer who comments is muted (the promo bot points them at the
 game to register, after which the bot restores their voice), and a registered, unblocked player simply
 writes. An operator can also **mute a player in the chat only** — a `chat_muted` role on the user card —
 without a full account block; an account block mutes them in the chat regardless. Muting and unmuting

docs/FUNCTIONAL_ru.md

@@ -32,12 +32,13 @@ top-1 подсказку, безлимитную проверку слова с
 главнее. Страница несёт статическую русскую SEO-«шапку» (title/description, карточка
 Open Graph, которую используют превью ссылок в Telegram/VK, канонический адрес
 продакшен-домена, JSON-LD, набор favicon и `robots.txt`), а оболочка SPA помечена
-`noindex` — индексируется только посадочная страница. В подвале — ссылки на **публичную
+`noindex` — индексируется только посадочная страница. В подвале — ссылки на три **юридических
-оферту** (`/offer/`) и рядом на **обратную связь** (тот самый Telegram-бот, который оферта
+документа** — **пользовательское соглашение** (`/eula/`), **политику конфиденциальности**
-указывает как контакт Продавца). Страница оферты (юридический документ, который принимается при
+(`/privacy/`) и **публичную оферту** (`/offer/`) — и рядом на **обратную связь** (тот самый
-покупке) рендерится по запросу из `ui/legal/offer_ru.md`, а её **перечень стоимости** (§4.4)
+Telegram-бот, который документы указывают как контакт Продавца). Каждый — **двуязычный (RU/EN)** с
-формируется из живого каталога товаров, поэтому опубликованные цены всегда совпадают с тем, что
+переключателем языка и темы, рендерится из исходников `ui/legal/*_{ru,en}.md` сайдкаром-рендерером;
-сейчас в продаже — без передеплоя.
+оферта дополнительно подставляет **перечень стоимости** (§4.4), формируемый из живого каталога
+товаров, поэтому опубликованные цены всегда совпадают с тем, что сейчас в продаже — без передеплоя.
 
 В обычном вебе клиент — **устанавливаемое PWA**: незалогиненный игрок видит призыв к установке
 под формой входа (и внизу «Настроек»), который в один тап ставит приложение на рабочий стол
@@ -76,7 +77,10 @@ launch-параметрам VK (их проверяет gateway), и при пе
 так как VK не кладёт имя в подписанный запуск). Пока тема в режиме «авто», приложение следует
 светлой/тёмной схеме VK-клиента, а раскладка обходит нижнюю home-bar VK на мобильных. Тот же экран
 тихого повтора «не удалось
-загрузить» действует и внутри VK.
+загрузить» действует и внутри VK. Если открыть ссылку на мини-приложение прямо в обычном браузере —
+вход `/vk/` без подписанного запуска VK или `/telegram/` без данных входа Telegram — показывается
+компактный экран диагностики, которым можно поделиться, вместо того чтобы продолжить (гостем-однодневкой
+на VK или редиректом прочь на Telegram), — чтобы игрок, случайно попавший туда, прислал нам скриншот.
 **Email**-вход (в вебе) отправляет на адрес брендированный шестизначный код подтверждения —
 локализованный (ru/en), без картинок; после ввода игрок входит. Новый адрес заводится при первом
 запросе, но становится постоянным аккаунтом только после подтверждения кода — так брошенная,
@@ -283,22 +287,27 @@ e-mail) либо ввод фразы. Активные игры форфейтя
 редкими ходами вопреки плану, затухающими к эндшпилю), а чат, nudge и «добавить в друзья» выключены. Партии с ИИ — это **тренировка**: они не идут в статистику игрока.
 
 ### Офлайн-режим
-Установленный веб-PWA со входом по подтверждённой почте может переключиться в осознанный
+**Веб- и нативное приложения** играют **офлайн автоматически** — никакого переключателя нет; онлайн-только
-**офлайн-режим** (Настройки → Режим игры). В офлайне приложение не обращается к сети: шапка синеет с
+**мини-приложения Telegram и VK** никогда не уходят в офлайн (всё ниже относится только к веб- и нативному
-меткой *Офлайн*, лобби показывает только сохранённые на устройстве игры, а сетевые поверхности
+приложениям). Когда оно не может достучаться
-отключены или скрыты (вкладка Статистика; вариант «случайный соперник» в Новой игре).
+до сервера, шапка синеет с меткой *Офлайн*, а игра ограничивается партиями на устройстве; кратковременный
-Новая игра против робота создаёт локальную **vs_ai**-игру — он ходит
+сбой пережидается как тихое *«Подключение…»* (в офлайн не роняет), а при возврате связи приложение само
-целиком в браузере без бэкенда. Локальные игры хранятся на устройстве, видны только в офлайн-режиме и
+возвращается онлайн с коротким тостом *соединение восстановлено*. В офлайне приложение не обращается к
-никогда не синхронизируются с аккаунтом. Чтобы игру можно было создать и сыграть без связи, приложение
+сети.
-заранее, пока ещё онлайн, подгружает словари включённых игроком вариантов и (после установки)
-запускается из прекешированного шелла даже без сети. Переключение **в** офлайн сначала проверяет, что
-словари включённых вариантов есть на устройстве — если каких-то не хватает, оно их подгружает и недолго
-ждёт, а если подготовить их не удаётся, остаётся онлайн с короткой заметкой *нужен интернет* (загрузка
-продолжается в фоне, так что следующее переключение мгновенно). Режим привязан к устройству и
-сохраняется между запусками.
 
-В офлайне «с друзьями» в Новой игре запускает **локальную игру по очереди (hotseat)** на 2–4 человек
+**Лобби остаётся единым**: локальные игры на устройстве активны, а серверные игры по-прежнему видны, но
-за одним устройством. Сначала задаётся **пароль ведущего** — 4-значный PIN на клавиатуре в стиле
+**затемнены** — их видно, но открыть нельзя, пока не вернётесь онлайн (тап поясняет почему). Сетевые
+поверхности (вкладка Статистика) отключены, а приглашения в офлайне скрыты. Новая игра против робота
+создаёт локальную **vs_ai**-игру, которая идёт целиком на устройстве без бэкенда; локальные игры хранятся
+на устройстве и никогда не синхронизируются с аккаунтом, так что игру можно создать и сыграть без связи.
+Приложение заранее, пока ещё онлайн, подгружает словари включённых игроком вариантов и (после установки
+или в нативном приложении) запускается из вшитых/прекешированных данных даже без сети; если словарь
+варианта недоступен офлайн, создание такой игры отключается с короткой заметкой.
+
+«С друзьями» в Новой игре предлагает выбор — **пригласить друга** для игры онлайн или **локальную игру
+по очереди (hotseat)** на 2–4 человек за одним устройством; без сети доступна только игра по очереди.
+(В онлайн-только мини-приложениях Telegram/VK «с друзьями» — это только приглашение друга, без игры по очереди.)
+В игре по очереди сначала задаётся **пароль ведущего** — 4-значный PIN на клавиатуре в стиле
 экрана блокировки; пока он не задан, строки игроков заблокированы. Затем приложение спрашивает,
 играете ли вы сами — если да, вы занимаете первое место под именем из профиля. Вы называете каждого
 игрока (от 2 до 4; строки можно добавлять и удалять, удаление спрашивает пароль ведущего) и можете
@@ -312,14 +321,32 @@ e-mail) либо ввод фразы. Активные игры форфейтя
 идущей или завершённой — из лобби спрашивает пароль ведущего, чтобы никто не стёр партию сразу после
 своего хода.
 
-Приложение также **само включает офлайн-режим**, когда не может достучаться до сети. При холодном
+Уход в офлайн и возврат — оба **автоматические**. При холодном запуске без связи приложение сразу
-запуске без связи оно переходит в офлайн на текущую сессию; когда устройство онлайн, но шлюз молчит
+стартует в офлайн-лобби; пока оно открыто, потеря сети — режим полёта — сама уводит в офлайн, а
-несколько секунд, оно сперва спрашивает — *Нет связи. Включить офлайн-режим?*, с выбором **Включить**
+восстановление сети само возвращает онлайн. Ни диалога, ни переключателя, который надо помнить:
-(уйти в офлайн) или **Ждать сеть** (продолжить попытки онлайн). Пока приложение открыто, потеря сети —
+кратковременный сбой пережидается тихо, и только устойчивая потеря переводит интерфейс в офлайн, так что
-режим полёта — переключает в офлайн автоматически, а её восстановление само возвращает онлайн.
+вас не прерывают из-за короткой икоты.
-Самостоятельно включённый офлайн временный: он возвращается в онлайн, как только сеть появилась, и
+
-следующий запуск проверяет заново. **Осознанный** офлайн — тумблер в Настройках или **Включить** в том
+### Актуальная версия
-диалоге — это выбор игрока: он сохраняется и никогда не отменяется автоматически.
+Когда требуется новая версия клиента, приложение не блокирует вас наглухо. В **нативном** приложении
+слишком старая сборка показывает уведомление с **Обновить** (открывает магазин) и **Играть офлайн**
+(закрыть и продолжить играть на устройстве); в вебе вместо этого предлагается **Обновить** (перезагрузка).
+Более мягкий, ненавязчивый баннер **«Доступно обновление»** появляется в лобби, когда есть новее — но пока
+не обязательная — версия; его можно обновить или закрыть, игра продолжается в любом случае.
+
+### Нативное приложение (Android)
+Игра также выходит как отдельное **приложение для Android** (сначала в **RuStore**) — упакованная сборка
+того же клиента. Всё необходимое встроено, поэтому оно открывается **без сети**: первый запуск офлайн сразу
+открывает лобби как **гость** (без экрана входа), и можно играть немедленно — против робота или в игру **по
+очереди на одном устройстве** (pass-and-play) с друзьями — используя словари, вшитые в приложение. Когда сеть
+доступна, приложение тихо заводит гостя в фоне, и онлайн-возможности (случайные соперники, друзья,
+статистика) включаются, не прерывая игру; локальные игры, начатые офлайн, остаются на устройстве. Чтобы
+сохранить постоянный аккаунт, вход выполняется по **email** из Профиля (гость становится вашим аккаунтом);
+вход через Telegram и VK в нативном приложении не предлагается. Встроенные покупки в этом первом релизе
+скрыты. Поскольку установленное приложение может быть намного старше сервера, сборка, которая **слишком
+стара** для общения с текущим сервером, показывает единственный несбрасываемый экран *обновления*, кнопка
+которого открывает страницу в магазине — он появляется только при онлайн-действии, никогда во время
+офлайн-игры.
 
 ### Социальное: друзья, блок, чат, nudge
 Подружиться можно двумя способами: погасить **одноразовый код**, который выпускает
@@ -418,9 +445,11 @@ Telegram. На сенсорном устройстве в настройках
 обратную связь (роль, а не полная блокировка аккаунта), видит кнопку отправки недоступной.
 
 ### Чат поддержки в Telegram
-С операторами можно поговорить и прямо из Telegram-бота: всё, что пользователь присылает боту,
+С операторами можно поговорить и прямо из Telegram-бота. Команда `/support` отвечает графиком работы
-кроме `/start` — текст, фото, голосовое, файл, — пересылается в закрытую группу поддержки операторов
+поддержки и напоминанием, что приложить (подробное описание и, по возможности, скриншоты). Всё
-и собирается в отдельную ветку на пользователя. Пользователь не получает автоответа; оператор
+остальное, что пользователь присылает боту, кроме `/start` — текст, фото, голосовое, файл, —
+пересылается в закрытую группу поддержки операторов и собирается в отдельную ветку на пользователя.
+Пользователь не получает автоответа на пересланное сообщение; оператор
 отвечает из этой ветки, и бот доставляет ответ обратно обычным сообщением — для пользователя это
 тихий диалог один на один. Операторы могут заблокировать пользователя (тогда бот молча игнорирует
 его сообщения) или очистить сообщения ветки. Это независимо от встроенной «Обратной связи» выше —
@@ -526,7 +555,9 @@ high-rate флага. С карточки пользователя операт
 
 Там, где бот ведёт **привязанный к каналу чат-обсуждение**, по умолчанию писать может каждый, а бот
 **глушит** игрока, который **не зарегистрирован** или **заблокирован**, и снимает мьют, как только тот
-зарегистрируется или будет разблокирован. То есть незарегистрированного новичка, написавшего в чат,
+зарегистрируется или будет разблокирован. Ещё бот убирает автоматический пин, который Telegram ставит
+на каждый пост канала, авто-форварднутый в чат, — закреплёнными остаются только намеренно закреплённые
+сообщения. То есть незарегистрированного новичка, написавшего в чат,
 бот глушит (промо-бот направляет его в игру зарегистрироваться, после чего бот возвращает голос), а
 зарегистрированный незаблокированный игрок просто пишет. Оператор также может **замьютить игрока только
 в чате** — роль `chat_muted` на карточке пользователя — без полной блокировки аккаунта; блокировка

docs/ICONS.md

@@ -0,0 +1,90 @@
+# Icon & logo asset map
+
+> The whole shipped icon set is sliced from **one master**. This file is the per-platform
+> **target map** (which file goes where, at what size). How the mark itself is constructed
+> — proportions, palette, wood grain, the light/shadow gradients, the «Э» + ✻ placement,
+> all in fractions of the side — is specified in [`ICON_BRANDBOOK.md`](ICON_BRANDBOOK.md).
+> The reference generator, the pinned Spectral font and the committed masters live in
+> [`../assets/icons/brand/`](../assets/icons/brand/).
+
+## The master (one source, six layers)
+
+`brand/build-icon.mjs` emits any `--variant light|dark` in any `--layer`:
+
+| Layer | What | Feeds |
+|---|---|---|
+| `full` | rounded tile + master mark | `favicon.svg` |
+| `flat` | square tile + master mark (OS rounds) | apple-touch, PWA "any", VK, TG, store |
+| `background` | square tile only, full-bleed | Android adaptive background |
+| `foreground` | mark only, transparent, re-placed for the round mask | Android adaptive foreground |
+| `maskable` | square tile + foreground-placed mark | PWA `maskable` |
+| `monochrome` | foreground-placed silhouette, flat colour | Android 13+ themed layer |
+
+`brand/build-set.mjs` renders every raster below; `brand/build-android-res.mjs` renders
+the Android launcher resources.
+
+## Generated targets
+
+### Web — `ui/public/` (via `brand/build-set.mjs`)
+
+| File | Size | Note |
+|---|---|---|
+| `favicon.svg` | vector | **light + dark in one file** via `prefers-color-scheme` |
+| `favicon.ico` | 32×32 | PNG-in-ICO; answers the blind `/favicon.ico` probe |
+| `apple-touch-icon.png` | 180×180 | opaque full-bleed (iOS masks its own corners) |
+| `icon-192.png` / `icon-512.png` | 192 / 512 | PWA `any`, light |
+| `icon-192-dark.png` / `icon-512-dark.png` | 192 / 512 | dark variants (generated; see PWA note) |
+| `icon-maskable-512.png` | 512×512 | PWA `maskable`, light |
+| `icon-maskable-512-dark.png` | 512×512 | dark variant (generated; see PWA note) |
+| `og-image.png` | 1200×630 | board-green card: master tile + «Эрудит» / Игра в слова |
+
+### PWA — `ui/public/manifest.webmanifest`
+
+Referenced icons are the **light** set (`icon-192`, `icon-512` = `any`;
+`icon-maskable-512` = `maskable`). The manifest has **no reliable way to pick an icon by
+colour scheme**, so the dark PNGs are **generated but not referenced** — theming the
+in-browser tab is handled by `favicon.svg` instead. Wire the dark files in only if a
+concrete installer target is known to honour them.
+
+### Android — `ui/android/app/src/main/res/` (via `brand/build-android-res.mjs`)
+
+Capacitor layer inputs are `ui/assets/{icon,icon-foreground,icon-background}.png`. The
+resources are **hand-generated from the layers**, not `capacitor-assets` — our layers
+already fill the 108 dp canvas (foreground inside the 61 % safe zone, background
+full-bleed), so they must be placed with **no inset**, and we add the **monochrome**
+themed layer, neither of which `capacitor-assets` does. Per density mdpi→xxxhdpi (+ldpi):
+
+- `mipmap-*/ic_launcher.png` / `ic_launcher_round.png` — legacy square / round (composite)
+- `mipmap-*/ic_launcher_foreground.png` + `ic_launcher_background.png` — adaptive layers
+- `mipmap-*/ic_launcher_monochrome.png` — themed layer
+- `mipmap-anydpi-v26/ic_launcher.xml` + `ic_launcher_round.xml` — **no `<inset>`**, with
+  `<background>` + `<foreground>` + `<monochrome>` (committed by hand)
+
+### iOS / iPhone / iPad — FUTURE
+
+No iOS shell today. When one exists, `flat` (opaque, no alpha, no rounded corners; the OS
+masks) drives the asset catalog — a single 1024×1024 marketing icon (Xcode derives the
+rest), plus light/dark/tinted where the catalog supports it.
+
+### VK / Telegram / store — manual upload (`brand/{vk,tg,store}/`)
+
+Square, **no rounding** (each platform crops/rounds itself), light `flat`:
+
+| Folder | Files | Use |
+|---|---|---|
+| `vk/` | `vk-576/278/150/32.png` | VK community / app icons |
+| `tg/` | `tg-512.png` | Telegram bot avatar + Mini App icon (512, square; TG crops circular) |
+| `tg/` | `tg-demo-640x360.png` | BotFather `/newapp` demo banner (tile + wordmark) |
+| `store/` | `rustore-512.png` | RuStore app icon |
+| RuStore | screenshots / feature graphic | per the RuStore listing spec (uploaded by hand) |
+| Google Play (future) | icon / feature graphic | 512×512 / 1024×500 |
+| App Store (future) | marketing icon / screenshots | 1024×1024 / per device class |
+
+## Regenerate
+
+```sh
+cd assets/icons/brand
+npm i                        # opentype.js (rasterisation reuses the ui package's chromium)
+node build-set.mjs           # web (ui/public) + Capacitor layers (ui/assets) + vk/ tg/ store/ + og
+node build-android-res.mjs   # Android launcher resources (all densities + monochrome)
+```

docs/ICON_BRANDBOOK.md

@@ -0,0 +1,166 @@
+# Erudit app-icon — brand book
+
+The single source of truth for **how the Erudit icon is constructed**. It is written to
+be reproducible *from words alone*: a designer with this document and the Spectral font
+can rebuild the icon exactly, at any size, without pixel-matching anything.
+
+Two rules make that possible:
+
+1. **The icon is a square.** Every size and position below is a **fraction of the
+   square's side** (equivalently, a percentage). Nothing is in pixels. Draw the square
+   at whatever resolution you need and scale each value to it.
+2. **The origin is the top-left corner.** `x` grows right, `y` grows down. So "center
+   `48.1% / 49.2%`" means a point `0.481·side` from the left and `0.492·side` from the top.
+
+The companion generator in [`../assets/icons/brand/`](../assets/icons/brand/) is the
+machine version of this exact spec (`build-icon.mjs`, where each constant is the same
+fraction printed here). The `docs/ICONS.md` map covers the *opposite* concern — which
+files/sizes we slice this master into for each platform.
+
+## Anatomy
+
+![Construction scheme](../assets/icons/brand/icon-construction.png)
+
+Bottom-to-top the icon is six layers: **tile → wood grain → light sheen → shadow →
+letter «Э» → star ✻**. The letter and star are always drawn last, at full ink colour;
+the grain and the two gradients only ever touch the background.
+
+## Palette
+
+The icon ships as a **light** and a **dark** variant (a matched pair — the light tile
+carries dark ink, the dark tile carries light ink). Each variant uses four colours.
+
+| Role | Light | Dark |
+|------|-------|------|
+| **Tile** — the wooden body | `#e6b053` | `#4a3316` |
+| **Ink** — the «Э» and the ✻ | `#5a3a12` | `#f2d9a0` |
+| **Grain** — the vertical stripes | `#d8a54e` | `#432e14` |
+| **Sheen** — diagonal light | white, α 0 → 15 % | white, α 0 → 15 % |
+| **Shadow** — diagonal dark | black, α 15 → 0 % | black, α 15 → 0 % |
+
+The grain colour is intentionally close to the tile — a hair darker — so the stripes
+read as wood texture, not as stripes.
+
+## 1 — Tile
+
+A **square with rounded corners**, corner radius **17 %** of the side, filled with the
+**Tile** colour. This is the whole background; there is no separate outer frame or
+border. Corners are baked at 17 %; platform masks (iOS/Android) may round further on top.
+
+## 2 — Wood grain
+
+Subtle vertical planks over the tile:
+
+- Divide the width into **6 equal columns** (each `1/6` of the side wide).
+- On the **right edge of each column**, draw one **vertical stripe**, width **`1/32` of
+  the side** (≈ 3.1 %), running the full height.
+- Move the **whole set of six stripes left** by **`1/16` of the side** (= two stripe
+  widths).
+- **Tilt every stripe 4°** (clockwise, about its own centre).
+- Draw the stripes **past the top and bottom edges** so the tilt leaves no empty corners,
+  then **clip the whole set to the tile** (so the rounded corners stay clean).
+- Colour: **Grain**.
+
+## 3 — Light sheen · 4 — Shadow
+
+Two linear gradients along the **same diagonal**, from the **bottom-left corner to the
+top-right corner**, each clipped to the tile and sitting **above the grain, below the
+letter**:
+
+- **Sheen** — white. Fully transparent at the bottom-left, rising to **15 % opacity** at
+  the top-right. Brightens the top-right.
+- **Shadow** — black. **15 % opacity** at the bottom-left, fading to transparent at the
+  top-right. Deepens the bottom-left.
+
+Together they give the tile a lit-from-the-top-right, resting-in-shadow-at-the-bottom-left
+sense of depth. Both percentages are a tuning knob (`--sheen`, `--shade`).
+
+## 5 — The letter «Э»
+
+- Typeface: **Spectral, Bold** (SIL OFL; pinned in the brand folder).
+- Glyph: the Cyrillic capital **«Э»** (U+042D).
+- Size: scale the glyph so its **ink bounding box is 60.5 % of the side tall** (its width
+  then follows the font — about 53.2 %).
+- Position: place the **center of that bounding box** at **48.1 % / 49.2 %** (just up and
+  left of the icon center).
+- Colour: **Ink**.
+
+## 6 — The star ✻
+
+A **six-spoke teardrop asterisk** (the "score" mark that replaces a tile's point number):
+
+- Each spoke tapers to a **point at the center** and ends in a **round bulb**; a central
+  disc equal to a bulb fuses the six spokes.
+- Outer diameter: **17.3 % of the side**.
+- Bulb radius (and the central disc): **22 % of the star's radius**.
+- Position: center at **78.8 % / 78.8 %** — tucked to the lower-right of the «Э», like a
+  subscript, with a clear gap from the letter.
+- Colour: **Ink**.
+
+Spectral has no ✻ glyph, so the star is **drawn geometrically**, not set as type. The exact
+construction is in `build-icon.mjs` (`starPath`).
+
+## Composition intent
+
+The «Э» and the ✻ are treated as **one group**. Its combined bounding box measures
+about **65.9 % × 68.6 %** of the side, and it is placed so its **bottom-right corner sits
+at 87.5 % / 87.5 %** of the icon (the lower-right corner of an inner `12.5 % … 87.5 %`
+safe square). That is what pushes the composition down-and-right and leaves the star room
+in the corner. When re-deriving positions, this is the anchor to preserve.
+
+> This bottom-right bias suits a **full-bleed** icon (iOS / PWA / favicon, which show
+> almost the whole square). Android crops more, so it uses a **separate two-layer build**
+> — see the next section. The master itself is never moved for Android.
+
+## Android adaptive icon (two layers)
+
+Android icons are **108×108 dp** and the OS applies its own mask (circle, squircle,
+rounded square…). Only the **inner 66 dp = 61 % of the side, centred** is guaranteed
+visible under every mask; the outer ~1/6 ring is used for the mask and motion effects.
+So Android is **not** the full-bleed master — it is built as two layers:
+
+- **Background** — the tile with wood grain and the light/shadow gradients, **full-bleed
+  and square** (no rounded corners; the OS supplies the shape). It fills the whole 108 dp
+  layer, so the sacrificial outer ring is just more wood.
+- **Foreground** — **only the «Э» + ✻**, transparent, **re-placed** to sit safely inside
+  the mask:
+  - «Э»: box height **53.9 %**, box center **52.3 % / 49.5 %**.
+  - ✻: outer diameter **13.2 %** (smaller than the master's), center **76.3 % / 72.7 %**,
+    tucked closer to the letter.
+  - The mark is centred, then nudged **right 8 % / down 3 %** so it reads optically
+    centred under the round mask, and the whole group fits within the **61 % safe zone**.
+
+Everything else (palette, grain, gradients, star construction) is identical to the master.
+
+## Variants in use
+
+The **light** variant is the primary icon (launcher, favicon, apple-touch, PWA). The
+**dark** variant is shipped in addition wherever the platform can pick by appearance
+(e.g. an SVG favicon via `prefers-color-scheme`). Where a platform allows only one icon,
+use **light**.
+
+## Reproduce
+
+```sh
+cd assets/icons/brand
+npm i opentype.js
+# full master (iOS / PWA / favicon), either variant:
+node build-icon.mjs --variant light --layer full        > icon-light.svg
+# Android adaptive layers:
+node build-icon.mjs --variant light --layer background   > icon-light-android-background.svg
+node build-icon.mjs --variant light --layer foreground   > icon-light-android-foreground.svg
+# the construction figure:
+node build-icon.mjs --variant light --scheme             > icon-construction.svg
+node render-png.mjs  icon-light.svg  icon-light.png  1024   # any size
+```
+
+`--layer` is `full` (default), `background`, or `foreground`. All outputs are committed
+alongside the generator in [`../assets/icons/brand/`](../assets/icons/brand/).
+
+## Masters
+
+| | Light | Dark |
+|-|-------|------|
+| **Full** (iOS / PWA / favicon) | ![light](../assets/icons/brand/icon-light.png) | ![dark](../assets/icons/brand/icon-dark.png) |
+| **Android background** | ![lbg](../assets/icons/brand/icon-light-android-background.png) | ![dbg](../assets/icons/brand/icon-dark-android-background.png) |
+| **Android foreground** | ![lfg](../assets/icons/brand/icon-light-android-foreground.png) | ![dfg](../assets/icons/brand/icon-dark-android-foreground.png) |

docs/TESTING.md

@@ -17,21 +17,43 @@ tests or touching CI.
 - **UI** — Vitest (unit) + Playwright
   (e2e), mirroring the chosen plain-Svelte + Vite toolchain. Vitest covers
   the FlatBuffers codecs (friend list, invitation, stats), the win-rate
-  derivation and the GCG share/copy/download choice, plus Playwright specs against the
+  derivation, the GCG share/copy/download choice and the **net-state reducer**
+  (`netstate.test.ts` — every transition of the connectivity/version machine, the anti-flap
+  hysteresis, the two-tier version decision and all 12 offline edge cases as pure assertions),
+  plus Playwright specs against the
   mock for the friends screen (code issue/redeem, accept a request), the lobby
   invitations section, the stats screen, profile editing, and the export chooser's
   finished-only visibility + its signed-URL download flow (route-intercepted). The
   **offline mode** spec (`e2e/offline.spec.ts`) plays a full device-local `vs_ai` game
-  end-to-end: it forces the installed-PWA display mode, enters offline through the
+  end-to-end: offline is **implicit** now (no toggle), so it drives the mock's `__net` hook to
-  Settings toggle (whose readiness check fetches the enabled variants' dawgs), then creates
+  auto-detect offline (asserting the toast, the greyed-from-cache server games and the disabled
-  and plays a local game with a **pinned bag seed** (`window.__mock.setLocalSeed`, so the
+  Stats tab), self-heals back online, then creates and plays a local game with a **pinned bag seed** (`window.__mock.setLocalSeed`, so the
   rack is deterministic and the human can tap out a precomputed opening), asserting the
   robot's real reply and the IndexedDB replay after a reload. A local game needs a real
   dictionary, so the mock's `fetchDict` serves the per-variant dawgs from the preview
   build's `/e2edict/`, copied in by `scripts/e2e-dict.mjs` from `E2E_DICT_DIR` — the `ui`
   CI job fetches the `scrabble-dictionary` release like the Go jobs; locally it defaults to
   the sibling `scrabble-solver/dawg`. These dawgs are never committed and never enter the
-  production build.
+  production build. The **native offline-first** spec (`e2e/native.spec.ts`) injects
+  `window.androidBridge` (so `@capacitor/core` resolves the platform to `android` — a bare
+  `Capacitor.getPlatform` stub is clobbered by the core shim), then asserts a no-session cold boot lands
+  in the **offline guest lobby** (not `/login`), plays a local vs_ai move from the **bundled** dawg tier
+  (`playwright.config.ts` bundles the dicts into `dist-e2e/dict/`), starts a hotseat game, and drives
+  `window.__native.reconcile()` to prove online lights up — the device-local game stays listed in the
+  **unified lobby** — and Profile hides the Telegram/VK link buttons.
+  The **version-gate** spec (`e2e/update.spec.ts`) drives the `__update` hook to prove both tiers — the
+  hard *Update / Play offline* notice (and that "Play offline" drops into the offline lobby) and the soft
+  dismissable *update available* nudge in the lobby; `retry.test.ts` covers the `FailedPrecondition →
+  update_required` mapping.
+- **Client-version gate** (Go, two tiers) — `gateway/internal/clientver` unit-tests the `v?MAJOR.MINOR.PATCH`
+  parse (with/without `v`, a `-N-gSHA` suffix, `dev`/empty ⇒ !ok) and ordering. `connectsrv`'s server tests
+  assert the **hard** tier — a too-old `Execute` returns `result_code = "update_required"` (and the op
+  handler never ran), a too-old `Subscribe` returns `FailedPrecondition`, and an absent header / empty min /
+  unparseable header / equal version all pass (fail-open) — and the **soft** tier (`TestExecuteUpdateRecommended`):
+  a served build in `min ≤ v < recommended` carries the `X-Update-Recommended: 1` response header, while a
+  too-old, up-to-date, absent/garbled, or dormant-tier request does not. `config` tests reject a non-empty
+  unparseable `GATEWAY_MIN_CLIENT_VERSION` / `GATEWAY_RECOMMENDED_CLIENT_VERSION`, and a recommended below the
+  minimum.
 - **Render sidecar** — `renderer/` (Node + skia-canvas executing the shared
   `ui/src/lib/gameimage.ts`) carries a `node --test` smoke: the committed fixture (a
   real self-played 35-move game) must rasterize to a plausible PNG
@@ -175,6 +197,16 @@ tests or touching CI.
   `inttest` drives the **feedback lifecycle** end to end: the guest / ban / pending gates, the reply
   read + one-week visibility window, the account-role grant/revoke, and the admin queue filters with
   delete / delete-all. The admin-console render test renders the feedback list + detail pages.
+- **Native Android (manual on-device smoke)** — the packaged APK is verified by hand on a device /
+  emulator before release (the automated e2e covers the offline-first logic; WebView-specific chrome and
+  store behaviour are not reproducible in Playwright). Checklist: installs and cold-launches; in
+  **airplane mode** the cold launch lands in the **guest lobby**; play a local **vs_ai** move and a
+  **2-player hotseat** game with no network; the hardware **Back** button navigates then exits at the
+  root; a share / export link resolves to `erudit-game.ru` (not `file://`); turning the **network on**
+  lights up online play (a server guest is established); Profile offers **email** sign-in but no
+  Telegram / VK link; and with `GATEWAY_MIN_CLIENT_VERSION` bumped above the build, an online action
+  raises the terminal **update** overlay. Measure native chrome (safe-area / edge-to-edge) by CDP, not by
+  eyeballing a screenshot — an emulator WebView may be newer than a user's device (see `.claude/CLAUDE.md`).
 
 ## Principles
 

gateway/Dockerfile

@@ -42,10 +42,15 @@ ENV VITE_TELEGRAM_BOT_ID=$VITE_TELEGRAM_BOT_ID \
     VITE_APP_VERSION=$VITE_APP_VERSION \
     VITE_ADS_STUB=$VITE_ADS_STUB
 
-# Install with the lockfile first (the workspace file carries pnpm's build-script
+# Install with the lockfile first, then build. Committed src/gen/ means no codegen here.
-# approval for esbuild), then build. Committed src/gen/ means no codegen here.
+# --ignore-scripts: the Vite build needs no dependency build script — esbuild's platform binary
+# ships as an optional dependency (only its CLI-shim postinstall is skipped, which Vite does not use),
+# and core-js-bundle's prebuilt file is read directly. It notably skips sharp's native build (a
+# `pnpm android:assets` tool via @capacitor/assets, unused here), which would otherwise fail on this
+# Alpine/musl stage with no prebuilt binary and no compiler. The workspace allowBuilds stay for local
+# installs (where android:assets does need sharp built).
 COPY ui/package.json ui/pnpm-lock.yaml ui/pnpm-workspace.yaml ./
-RUN pnpm install --frozen-lockfile
+RUN pnpm install --frozen-lockfile --ignore-scripts
 COPY ui ./
 RUN pnpm build
 

gateway/README.md

@@ -121,7 +121,8 @@ web code exchange via `internal/vkid`, and both forward the trusted `external_id
 Rate-limit defaults (built-in): public 30/min·IP (burst 10), authenticated
 300/min·user (burst 80, sized for multi-device play), admin
 60/min·IP (burst 20, guarding the `/_gm` mount ahead of its Basic-Auth),
-email-code 5/10 min·IP (burst 2).
+email-code 5/10 min·IP (burst 4, covering request + a mistyped code + the
+correct one; defence-in-depth over the backend's per-code 5-attempt/15-min cap).
 
 Every rejection increments `gateway_rate_limited_total{class}`
 (`user`/`public`/`email`/`admin`) and logs one Debug line; a reporter drains the

gateway/cmd/gateway/main.go

@@ -237,6 +237,8 @@ func run(ctx context.Context, cfg config.Config, logger *zap.Logger) error {
 		AdminProxy:               adminProxy,
 		Meter:                    tel.MeterProvider().Meter("scrabble/gateway/edge"),
 		MaxBodyBytes:             cfg.MaxBodyBytes,
+		MinClientVersion:         cfg.MinClientVersion,
+		RecommendedClientVersion: cfg.RecommendedClientVersion,
 	})
 
 	// Bridge the backend push stream into the fan-out hub (and the out-of-app

gateway/internal/clientver/clientver.go

@@ -0,0 +1,57 @@
+// Package clientver parses and compares the leading MAJOR.MINOR.PATCH of a client
+// version string so the edge can turn away a build too old to speak the current wire
+// contract. It is deliberately dependency-free and tolerant: the version rides an HTTP
+// header (X-Client-Version) that a build stamps from `git describe --tags`, so any
+// `-N-gSHA` or `+meta` suffix is ignored, and anything unparseable is reported as such
+// (the caller fails open — an absent or garbled header is never treated as too old).
+package clientver
+
+import (
+	"strconv"
+	"strings"
+)
+
+// Version is a parsed semantic version triple. Only MAJOR.MINOR.PATCH participate in the
+// ordering; any pre-release or build suffix is dropped at parse time.
+type Version struct {
+	Major, Minor, Patch int
+}
+
+// Parse extracts the leading MAJOR.MINOR.PATCH from s, tolerating an optional leading
+// "v" and any `-N-gSHA` or `+meta` suffix (as produced by `git describe --tags`). It
+// reports ok=false when s has fewer than three numeric components or any component is not
+// an integer, so the caller can distinguish a real version from a dev/empty string.
+func Parse(s string) (Version, bool) {
+	s = strings.TrimPrefix(strings.TrimSpace(s), "v")
+	if i := strings.IndexAny(s, "-+"); i >= 0 {
+		s = s[:i]
+	}
+	p := strings.SplitN(s, ".", 4)
+	if len(p) < 3 {
+		return Version{}, false
+	}
+	var v Version
+	var err error
+	if v.Major, err = strconv.Atoi(p[0]); err != nil {
+		return Version{}, false
+	}
+	if v.Minor, err = strconv.Atoi(p[1]); err != nil {
+		return Version{}, false
+	}
+	if v.Patch, err = strconv.Atoi(p[2]); err != nil {
+		return Version{}, false
+	}
+	return v, true
+}
+
+// Less reports whether a orders before b by MAJOR, then MINOR, then PATCH. Equal versions
+// are not Less than each other, so a client exactly at the minimum passes the gate.
+func Less(a, b Version) bool {
+	if a.Major != b.Major {
+		return a.Major < b.Major
+	}
+	if a.Minor != b.Minor {
+		return a.Minor < b.Minor
+	}
+	return a.Patch < b.Patch
+}

gateway/internal/clientver/clientver_test.go

@@ -0,0 +1,63 @@
+package clientver
+
+import "testing"
+
+// TestParse covers the version strings the edge actually sees: a plain and a "v"-prefixed
+// triple, a `git describe --tags` suffix, build metadata, surrounding space, and the
+// non-version strings (dev/empty/too-few/non-numeric) that must report ok=false so the
+// gate fails open.
+func TestParse(t *testing.T) {
+	tests := []struct {
+		name  string
+		in    string
+		want  Version
+		wantK bool
+	}{
+		{"plain", "1.16.0", Version{1, 16, 0}, true},
+		{"v-prefixed", "v1.16.0", Version{1, 16, 0}, true},
+		{"git describe suffix", "v1.16.0-3-gabc1234", Version{1, 16, 0}, true},
+		{"build metadata", "1.16.0+ci42", Version{1, 16, 0}, true},
+		{"surrounding space", "  v2.0.1 ", Version{2, 0, 1}, true},
+		{"extra component ignored", "v1.16.0.4", Version{1, 16, 0}, true},
+		{"dev", "dev", Version{}, false},
+		{"empty", "", Version{}, false},
+		{"too few components", "1.16", Version{}, false},
+		{"non-numeric patch", "1.16.x", Version{}, false},
+	}
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			got, ok := Parse(tc.in)
+			if ok != tc.wantK {
+				t.Fatalf("Parse(%q) ok = %v, want %v", tc.in, ok, tc.wantK)
+			}
+			if ok && got != tc.want {
+				t.Errorf("Parse(%q) = %+v, want %+v", tc.in, got, tc.want)
+			}
+		})
+	}
+}
+
+// TestLess covers the ordering by MAJOR, then MINOR, then PATCH, and that an equal version
+// is not Less (a client exactly at the minimum passes the gate).
+func TestLess(t *testing.T) {
+	tests := []struct {
+		name string
+		a, b Version
+		want bool
+	}{
+		{"equal", Version{1, 16, 0}, Version{1, 16, 0}, false},
+		{"major less", Version{1, 9, 9}, Version{2, 0, 0}, true},
+		{"major greater", Version{2, 0, 0}, Version{1, 9, 9}, false},
+		{"minor less", Version{1, 16, 5}, Version{1, 17, 0}, true},
+		{"minor greater", Version{1, 17, 0}, Version{1, 16, 9}, false},
+		{"patch less", Version{1, 16, 0}, Version{1, 16, 1}, true},
+		{"patch greater", Version{1, 16, 2}, Version{1, 16, 1}, false},
+	}
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			if got := Less(tc.a, tc.b); got != tc.want {
+				t.Errorf("Less(%+v, %+v) = %v, want %v", tc.a, tc.b, got, tc.want)
+			}
+		})
+	}
+}

gateway/internal/config/config.go

@@ -9,6 +9,7 @@ import (
 	"strings"
 	"time"
 
+	"scrabble/gateway/internal/clientver"
 	pkgtel "scrabble/pkg/telemetry"
 )
 
@@ -54,6 +55,16 @@ type Config struct {
 	// MaxBodyBytes caps one inbound request body on the public listener and one
 	// Connect message read; oversized requests are refused without buffering.
 	MaxBodyBytes int
+	// MinClientVersion, when non-empty, is the lowest client version (MAJOR.MINOR.PATCH)
+	// the edge serves. A client reporting an older X-Client-Version is turned away with an
+	// "update required" signal before its payload is decoded. Empty leaves the gate dormant
+	// (every client is served) — the default for web-only deployments.
+	MinClientVersion string
+	// RecommendedClientVersion, when non-empty, is the version below which a served client is nudged
+	// to update — a non-blocking "update available" signal (the X-Update-Recommended response header)
+	// on gated responses; the call still succeeds. It must be at least MinClientVersion. Empty leaves
+	// the soft tier off (the default); it does not affect the hard MinClientVersion gate.
+	RecommendedClientVersion string
 	// RateLimit configures the in-memory anti-abuse limiter.
 	RateLimit RateLimitConfig
 	// Abuse configures the temporary IP ban and the honeytoken (prod-only).
@@ -154,7 +165,12 @@ func DefaultRateLimit() RateLimitConfig {
 		// because multi-device play tripped the old 120/40.
 		UserPerMinute: 300, UserBurst: 80,
 		AdminPerMinute: 60, AdminBurst: 20,
-		EmailPer10Min: 5, EmailBurst: 2,
+		// Email-code path (per IP), defence-in-depth over the backend's own per-code guards
+		// (a 5-attempt cap + 15-min TTL + per-recipient send throttle). Burst 4 so the honest flow
+		// — request a code, mistype once or twice, then enter the right one — is not throttled
+		// mid-login: a request + wrong-code + right-code sequence exhausted the old burst of 2 and
+		// tripped the limit on the correct code, which the client mis-read as going offline.
+		EmailPer10Min: 5, EmailBurst: 4,
 	}
 }
 
@@ -234,6 +250,8 @@ func Load() (Config, error) {
 		AdminPassword:            os.Getenv("GATEWAY_ADMIN_PASSWORD"),
 		ValidatorAddr:            os.Getenv("GATEWAY_VALIDATOR_ADDR"),
 		VKAppSecret:              os.Getenv("GATEWAY_VK_APP_SECRET"),
+		MinClientVersion:         os.Getenv("GATEWAY_MIN_CLIENT_VERSION"),
+		RecommendedClientVersion: os.Getenv("GATEWAY_RECOMMENDED_CLIENT_VERSION"),
 		VKID: VKIDConfig{
 			AppID:        os.Getenv("GATEWAY_VK_ID_APP_ID"),
 			ClientSecret: os.Getenv("GATEWAY_VK_ID_CLIENT_SECRET"),
@@ -332,6 +350,23 @@ func (c Config) validate() error {
 	if c.MaxBodyBytes <= 0 {
 		return fmt.Errorf("config: GATEWAY_MAX_BODY_BYTES must be positive")
 	}
+	if c.MinClientVersion != "" {
+		if _, ok := clientver.Parse(c.MinClientVersion); !ok {
+			return fmt.Errorf("config: GATEWAY_MIN_CLIENT_VERSION %q is not a MAJOR.MINOR.PATCH version", c.MinClientVersion)
+		}
+	}
+	if c.RecommendedClientVersion != "" {
+		rec, ok := clientver.Parse(c.RecommendedClientVersion)
+		if !ok {
+			return fmt.Errorf("config: GATEWAY_RECOMMENDED_CLIENT_VERSION %q is not a MAJOR.MINOR.PATCH version", c.RecommendedClientVersion)
+		}
+		// The soft tier must sit at or above the hard minimum: a recommended below the minimum is a
+		// misconfiguration (every client below min is already turned away). An empty/unparseable
+		// minimum imposes no lower bound, so the recommended may stand alone.
+		if min, ok := clientver.Parse(c.MinClientVersion); ok && clientver.Less(rec, min) {
+			return fmt.Errorf("config: GATEWAY_RECOMMENDED_CLIENT_VERSION %q must be >= GATEWAY_MIN_CLIENT_VERSION %q", c.RecommendedClientVersion, c.MinClientVersion)
+		}
+	}
 	if c.Abuse.BanEnabled && (c.Abuse.BanThreshold <= 0 || c.Abuse.BanWindow <= 0 || c.Abuse.BanDuration <= 0) {
 		return fmt.Errorf("config: GATEWAY_ABUSE_BAN_THRESHOLD/_WINDOW/_DURATION must be positive when GATEWAY_ABUSE_BAN_ENABLED")
 	}

gateway/internal/config/config_test.go

@@ -47,6 +47,65 @@ func TestLoadMaxBodyBytes(t *testing.T) {
 	}
 }
 
+// TestLoadMinClientVersion verifies the client-version gate config: dormant (empty) by
+// default, a parseable version accepted, and an unparseable one rejected.
+func TestLoadMinClientVersion(t *testing.T) {
+	c, err := Load()
+	if err != nil {
+		t.Fatalf("Load: %v", err)
+	}
+	if c.MinClientVersion != "" {
+		t.Errorf("MinClientVersion = %q, want empty (gate dormant)", c.MinClientVersion)
+	}
+	t.Setenv("GATEWAY_MIN_CLIENT_VERSION", "v1.16.0")
+	if c, err = Load(); err != nil {
+		t.Fatalf("Load with a valid min version: %v", err)
+	}
+	if c.MinClientVersion != "v1.16.0" {
+		t.Errorf("MinClientVersion = %q, want %q", c.MinClientVersion, "v1.16.0")
+	}
+	t.Setenv("GATEWAY_MIN_CLIENT_VERSION", "dev")
+	if _, err := Load(); err == nil {
+		t.Fatal("Load: expected an error for an unparseable GATEWAY_MIN_CLIENT_VERSION, got nil")
+	}
+}
+
+// TestLoadRecommendedClientVersion verifies the soft-tier config: dormant (empty) by default, a
+// parseable version accepted (standing alone with no minimum, or at/above one), an unparseable one
+// rejected, and a recommended below the minimum rejected.
+func TestLoadRecommendedClientVersion(t *testing.T) {
+	c, err := Load()
+	if err != nil {
+		t.Fatalf("Load: %v", err)
+	}
+	if c.RecommendedClientVersion != "" {
+		t.Errorf("RecommendedClientVersion = %q, want empty (soft tier dormant)", c.RecommendedClientVersion)
+	}
+	// Stands alone with no minimum configured.
+	t.Setenv("GATEWAY_RECOMMENDED_CLIENT_VERSION", "v1.20.0")
+	if c, err = Load(); err != nil {
+		t.Fatalf("Load with a valid recommended version (no min): %v", err)
+	}
+	if c.RecommendedClientVersion != "v1.20.0" {
+		t.Errorf("RecommendedClientVersion = %q, want %q", c.RecommendedClientVersion, "v1.20.0")
+	}
+	// At or above the minimum is accepted.
+	t.Setenv("GATEWAY_MIN_CLIENT_VERSION", "v1.16.0")
+	if _, err = Load(); err != nil {
+		t.Fatalf("Load with recommended >= min: %v", err)
+	}
+	// Below the minimum is rejected.
+	t.Setenv("GATEWAY_RECOMMENDED_CLIENT_VERSION", "v1.10.0")
+	if _, err := Load(); err == nil {
+		t.Fatal("Load: expected an error for a recommended version below the minimum, got nil")
+	}
+	// Unparseable is rejected.
+	t.Setenv("GATEWAY_RECOMMENDED_CLIENT_VERSION", "dev")
+	if _, err := Load(); err == nil {
+		t.Fatal("Load: expected an error for an unparseable GATEWAY_RECOMMENDED_CLIENT_VERSION, got nil")
+	}
+}
+
 // TestLoadAbuseDefaults verifies the anti-abuse ban defaults: disabled (prod-only),
 // the agreed thresholds, and no honeytoken.
 func TestLoadAbuseDefaults(t *testing.T) {

gateway/internal/connectsrv/errors.go

@@ -12,6 +12,7 @@ var (
 	errInternal       = errors.New("internal error")
 	errMissingToken   = errors.New("missing session token")
 	errInvalidSession = errors.New("invalid or expired session")
+	errUpdateRequired = errors.New("client too old, update required")
 )
 
 // errUnknownMessageType reports an unregistered message type.

gateway/internal/connectsrv/server.go

@@ -26,6 +26,7 @@ import (
 	"golang.org/x/net/http2/h2c"
 
 	"scrabble/gateway/internal/backendclient"
+	"scrabble/gateway/internal/clientver"
 	"scrabble/gateway/internal/config"
 	"scrabble/gateway/internal/push"
 	"scrabble/gateway/internal/ratelimit"
@@ -46,6 +47,21 @@ const heartbeatKind = "heartbeat"
 // spoofer, so trusting it is safe.
 const honeypotHeader = "X-Scrabble-Honeypot"
 
+// clientVersionHeader carries the client build version (stamped from `git describe --tags`) so
+// the edge can turn away a build too old to speak the current wire contract, before it decodes
+// the payload. resultUpdateRequired is the stable envelope result_code — with the Subscribe
+// counterpart connect.CodeFailedPrecondition — that any build, however old, recognises as
+// "you must update". updateRecommendedHeader is the additive, non-blocking soft-tier signal: set
+// on a served Execute response when the client is at or above the hard minimum but below the
+// recommended version, it nudges an update without failing the call. Headers are the
+// version-tolerant layer, so an old client simply ignores it. All part of the frozen wire
+// contract (docs/ARCHITECTURE.md §2).
+const (
+	clientVersionHeader     = "X-Client-Version"
+	resultUpdateRequired    = "update_required"
+	updateRecommendedHeader = "X-Update-Recommended"
+)
+
 // Limiter classes, the `class` attribute of gateway_rate_limited_total and the
 // class field of the periodic rejection report.
 const (
@@ -88,6 +104,17 @@ type Server struct {
 
 	maxBodyBytes int
 
+	// minClient is the lowest client version served; gateOn is false when the gate is dormant
+	// (GATEWAY_MIN_CLIENT_VERSION empty or unparseable).
+	minClient clientver.Version
+	gateOn    bool
+
+	// recClient is the version below which a served client is nudged to update (the soft tier);
+	// recOn is false when the soft tier is dormant (GATEWAY_RECOMMENDED_CLIENT_VERSION empty or
+	// unparseable). It is independent of the hard gate.
+	recClient clientver.Version
+	recOn     bool
+
 	publicPolicy ratelimit.Policy
 	userPolicy   ratelimit.Policy
 	emailPolicy  ratelimit.Policy
@@ -128,6 +155,13 @@ type Deps struct {
 	// MaxBodyBytes caps one inbound request body and one Connect message read;
 	// zero or negative selects config.DefaultMaxBodyBytes.
 	MaxBodyBytes int
+	// MinClientVersion is the lowest client version (MAJOR.MINOR.PATCH) the edge serves; an
+	// older X-Client-Version is turned away with "update required". Empty or unparseable leaves
+	// the gate dormant.
+	MinClientVersion string
+	// RecommendedClientVersion is the version below which a served client is nudged to update (the
+	// non-blocking X-Update-Recommended header). Empty or unparseable leaves the soft tier dormant.
+	RecommendedClientVersion string
 }
 
 // NewServer constructs the edge service.
@@ -160,6 +194,30 @@ func NewServer(d Deps) *Server {
 	if rl == (config.RateLimitConfig{}) {
 		rl = config.DefaultRateLimit()
 	}
+	// Parse the minimum client version once. Config.validate already rejects an unparseable
+	// value, so the warn branch only guards a direct (test) construction; an empty value leaves
+	// the gate dormant.
+	var minClient clientver.Version
+	gateOn := false
+	if d.MinClientVersion != "" {
+		if v, ok := clientver.Parse(d.MinClientVersion); ok {
+			minClient, gateOn = v, true
+		} else {
+			log.Warn("ignoring unparseable MinClientVersion; client-version gate disabled", zap.String("value", d.MinClientVersion))
+		}
+	}
+	// Parse the recommended (soft-tier) version once, the same way. Config.validate already rejects an
+	// unparseable value or one below the minimum, so the warn branch only guards a direct (test)
+	// construction; an empty value leaves the soft tier dormant.
+	var recClient clientver.Version
+	recOn := false
+	if d.RecommendedClientVersion != "" {
+		if v, ok := clientver.Parse(d.RecommendedClientVersion); ok {
+			recClient, recOn = v, true
+		} else {
+			log.Warn("ignoring unparseable RecommendedClientVersion; update-recommended tier disabled", zap.String("value", d.RecommendedClientVersion))
+		}
+	}
 	return &Server{
 		registry:     d.Registry,
 		sessions:     d.Sessions,
@@ -176,6 +234,10 @@ func NewServer(d Deps) *Server {
 		adminProxy:   d.AdminProxy,
 		metrics:      newServerMetrics(d.Meter, blocklist),
 		maxBodyBytes: maxBody,
+		minClient:    minClient,
+		gateOn:       gateOn,
+		recClient:    recClient,
+		recOn:        recOn,
 		publicPolicy: ratelimit.PerMinute(rl.PublicPerMinute, rl.PublicBurst),
 		userPolicy:   ratelimit.PerMinute(rl.UserPerMinute, rl.UserBurst),
 		emailPolicy:  ratelimit.Per(rl.EmailPer10Min, 10*time.Minute, rl.EmailBurst),
@@ -285,15 +347,71 @@ func (s *Server) abuseGuard(next http.Handler) http.Handler {
 	})
 }
 
+// clientTooOld reports whether the X-Client-Version header names a version below the configured
+// minimum. It fails open: with the gate dormant, or an absent or unparseable header, it returns
+// false. The header is a client-controlled compatibility signal, not an access control (it is
+// trivially spoofable), so a missing or garbled value — an old build predating the header, or a
+// non-browser caller — must never be blocked spuriously.
+func (s *Server) clientTooOld(header string) bool {
+	if !s.gateOn {
+		return false
+	}
+	v, ok := clientver.Parse(header)
+	if !ok {
+		return false
+	}
+	return clientver.Less(v, s.minClient)
+}
+
+// clientUpdateRecommended reports whether the X-Client-Version header names a version in the soft
+// band — at or above the hard minimum but below the recommended version — so a served response can
+// carry the non-blocking X-Update-Recommended nudge. It fails open exactly like clientTooOld: a
+// dormant soft tier, or an absent or unparseable header, returns false. A client below the minimum is
+// turned away by the hard gate and is never nudged, so it is excluded here too (a dormant hard gate
+// leaves minClient at the zero version, which no real version is below, so the band is simply
+// "below recommended").
+func (s *Server) clientUpdateRecommended(header string) bool {
+	if !s.recOn {
+		return false
+	}
+	v, ok := clientver.Parse(header)
+	if !ok {
+		return false
+	}
+	return !clientver.Less(v, s.minClient) && clientver.Less(v, s.recClient)
+}
+
 // Execute runs one unary operation. Domain failures are returned in the envelope
 // (result_code != "ok", HTTP 200); only edge failures (rate limit, missing
 // session, unknown type, internal) become Connect errors.
-func (s *Server) Execute(ctx context.Context, req *connect.Request[edgev1.ExecuteRequest]) (*connect.Response[edgev1.ExecuteResponse], error) {
+func (s *Server) Execute(ctx context.Context, req *connect.Request[edgev1.ExecuteRequest]) (resp *connect.Response[edgev1.ExecuteResponse], err error) {
 	start := time.Now()
 	msgType := req.Msg.GetMessageType()
 	result := "internal"
 	defer func() { s.metrics.recordEdge(ctx, msgType, result, start) }()
 
+	// The soft-tier nudge rides a response header on any served response (the call still succeeds), so a
+	// client at or above the hard minimum but below the recommended version is told an update is
+	// available without being interrupted. A too-old client (turned away below) or a missing/garbled
+	// version yields no nudge.
+	recommend := s.clientUpdateRecommended(req.Header().Get(clientVersionHeader))
+	defer func() {
+		if recommend && resp != nil {
+			resp.Header().Set(updateRecommendedHeader, "1")
+		}
+	}()
+
+	// The version gate rides the outermost stable layer (an HTTP header) and is checked before
+	// the payload is decoded, so a too-old client makes zero successful calls but sees the
+	// recognizable update_required envelope rather than a decode crash (docs/ARCHITECTURE.md §2).
+	if s.clientTooOld(req.Header().Get(clientVersionHeader)) {
+		result = resultUpdateRequired
+		return connect.NewResponse(&edgev1.ExecuteResponse{
+			RequestId:  req.Msg.GetRequestId(),
+			ResultCode: resultUpdateRequired,
+		}), nil
+	}
+
 	op, ok := s.registry.Lookup(msgType)
 	if !ok {
 		result = "unknown_type"
@@ -363,6 +481,11 @@ func (s *Server) Execute(ctx context.Context, req *connect.Request[edgev1.Execut
 // Subscribe streams the authenticated user's live events with a keep-alive
 // heartbeat until the client disconnects.
 func (s *Server) Subscribe(ctx context.Context, req *connect.Request[edgev1.SubscribeRequest], stream *connect.ServerStream[edgev1.Event]) error {
+	// A stream carries no result_code, so a too-old client is refused with the Connect
+	// FailedPrecondition counterpart of the update_required sentinel.
+	if s.clientTooOld(req.Header().Get(clientVersionHeader)) {
+		return connect.NewError(connect.CodeFailedPrecondition, errUpdateRequired)
+	}
 	uid, _, _, err := s.resolve(ctx, req.Header(), peerIP(req.Peer().Addr, req.Header()))
 	if err != nil {
 		return err

gateway/internal/connectsrv/server_test.go

@@ -22,8 +22,13 @@ import (
 )
 
 // newEdge wires a connectsrv.Server over a fake backend and returns a Connect
-// client plus a cleanup func.
+// client plus a cleanup func. The client-version gate is off.
 func newEdge(t *testing.T, backendHandler http.HandlerFunc) (edgev1connect.GatewayClient, func()) {
+	return newEdgeMin(t, "", backendHandler)
+}
+
+// newEdgeMin is newEdge with the client-version gate armed at minVersion (empty leaves it off).
+func newEdgeMin(t *testing.T, minVersion string, backendHandler http.HandlerFunc) (edgev1connect.GatewayClient, func()) {
 	t.Helper()
 	backendSrv := httptest.NewServer(backendHandler)
 	backend, err := backendclient.New(backendSrv.URL, "localhost:9090", 2*time.Second)
@@ -37,6 +42,34 @@ func newEdge(t *testing.T, backendHandler http.HandlerFunc) (edgev1connect.Gatew
 		Hub:              push.NewHub(0),
 		RateLimit:        config.DefaultRateLimit(),
 		Heartbeat:        15 * time.Second,
+		MinClientVersion: minVersion,
+	})
+	edgeSrv := httptest.NewServer(edge.HTTPHandler())
+	client := edgev1connect.NewGatewayClient(http.DefaultClient, edgeSrv.URL)
+	return client, func() {
+		edgeSrv.Close()
+		_ = backend.Close()
+		backendSrv.Close()
+	}
+}
+
+// newEdgeVersions is newEdgeMin with the soft-tier recommended version also armed (empty leaves it off).
+func newEdgeVersions(t *testing.T, minVersion, recommendedVersion string, backendHandler http.HandlerFunc) (edgev1connect.GatewayClient, func()) {
+	t.Helper()
+	backendSrv := httptest.NewServer(backendHandler)
+	backend, err := backendclient.New(backendSrv.URL, "localhost:9090", 2*time.Second)
+	if err != nil {
+		t.Fatalf("backendclient: %v", err)
+	}
+	edge := connectsrv.NewServer(connectsrv.Deps{
+		Registry:                 transcode.NewRegistry(backend, nil),
+		Sessions:                 session.NewCache(backend, time.Minute, 100),
+		Limiter:                  ratelimit.New(),
+		Hub:                      push.NewHub(0),
+		RateLimit:                config.DefaultRateLimit(),
+		Heartbeat:                15 * time.Second,
+		MinClientVersion:         minVersion,
+		RecommendedClientVersion: recommendedVersion,
 	})
 	edgeSrv := httptest.NewServer(edge.HTTPHandler())
 	client := edgev1connect.NewGatewayClient(http.DefaultClient, edgeSrv.URL)
@@ -108,6 +141,132 @@ func TestExecuteGuestGate(t *testing.T) {
 	}
 }
 
+// TestExecuteVersionGate verifies the client-version gate on the unary path: a build older
+// than the configured minimum is turned away with the update_required result code before the
+// registry lookup (an unknown message type is gated too, proving the short-circuit), while an
+// equal, newer, absent, or unparseable version passes; and the gate is dormant when unset.
+func TestExecuteVersionGate(t *testing.T) {
+	// The backend answers auth.guest with a session; a gated call never reaches it.
+	backend := func(w http.ResponseWriter, _ *http.Request) {
+		_, _ = w.Write([]byte(`{"token":"tok","user_id":"u-1","is_guest":true,"display_name":"Guest"}`))
+	}
+	tests := []struct {
+		name    string
+		min     string
+		header  string
+		msgType string
+		want    string
+	}{
+		{"too old is gated before lookup", "v1.16.0", "v1.0.0", "bogus.unknown", "update_required"},
+		{"equal passes", "v1.16.0", "v1.16.0", transcode.MsgAuthGuest, "ok"},
+		{"newer passes", "v1.16.0", "v2.0.0", transcode.MsgAuthGuest, "ok"},
+		{"absent header fails open", "v1.16.0", "", transcode.MsgAuthGuest, "ok"},
+		{"unparseable header fails open", "v1.16.0", "dev", transcode.MsgAuthGuest, "ok"},
+		{"gate dormant when unset", "", "v1.0.0", transcode.MsgAuthGuest, "ok"},
+	}
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			client, cleanup := newEdgeMin(t, tc.min, backend)
+			defer cleanup()
+			req := connect.NewRequest(&edgev1.ExecuteRequest{MessageType: tc.msgType, RequestId: "rq"})
+			if tc.header != "" {
+				req.Header().Set("X-Client-Version", tc.header)
+			}
+			resp, err := client.Execute(context.Background(), req)
+			if err != nil {
+				t.Fatalf("execute: %v", err)
+			}
+			if got := resp.Msg.GetResultCode(); got != tc.want {
+				t.Fatalf("result_code = %q, want %q", got, tc.want)
+			}
+		})
+	}
+}
+
+// TestExecuteUpdateRecommended verifies the soft-tier nudge on the unary path: a served client at or
+// above the hard minimum but below the recommended version gets the X-Update-Recommended response
+// header (the call still succeeds); a too-old (hard-gated), up-to-date, absent, or unparseable version
+// and a dormant soft tier get no header.
+func TestExecuteUpdateRecommended(t *testing.T) {
+	backend := func(w http.ResponseWriter, _ *http.Request) {
+		_, _ = w.Write([]byte(`{"token":"tok","user_id":"u-1","is_guest":true,"display_name":"Guest"}`))
+	}
+	tests := []struct {
+		name       string
+		min        string
+		rec        string
+		header     string
+		wantResult string
+		wantHeader bool
+	}{
+		{"soft band is nudged", "v1.16.0", "v1.20.0", "v1.17.0", "ok", true},
+		{"at the minimum is nudged", "v1.16.0", "v1.20.0", "v1.16.0", "ok", true},
+		{"at the recommended is not nudged", "v1.16.0", "v1.20.0", "v1.20.0", "ok", false},
+		{"newer than recommended is not nudged", "v1.16.0", "v1.20.0", "v2.0.0", "ok", false},
+		{"too old is gated, not nudged", "v1.16.0", "v1.20.0", "v1.0.0", "update_required", false},
+		{"absent header, no nudge", "v1.16.0", "v1.20.0", "", "ok", false},
+		{"unparseable header, no nudge", "v1.16.0", "v1.20.0", "dev", "ok", false},
+		{"recommended alone (no min) nudges below it", "", "v1.20.0", "v1.0.0", "ok", true},
+		{"soft tier dormant, no nudge", "v1.16.0", "", "v1.0.0", "update_required", false},
+	}
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			client, cleanup := newEdgeVersions(t, tc.min, tc.rec, backend)
+			defer cleanup()
+			req := connect.NewRequest(&edgev1.ExecuteRequest{MessageType: transcode.MsgAuthGuest, RequestId: "rq"})
+			if tc.header != "" {
+				req.Header().Set("X-Client-Version", tc.header)
+			}
+			resp, err := client.Execute(context.Background(), req)
+			if err != nil {
+				t.Fatalf("execute: %v", err)
+			}
+			if got := resp.Msg.GetResultCode(); got != tc.wantResult {
+				t.Fatalf("result_code = %q, want %q", got, tc.wantResult)
+			}
+			if got := resp.Header().Get("X-Update-Recommended") == "1"; got != tc.wantHeader {
+				t.Fatalf("X-Update-Recommended present = %v, want %v", got, tc.wantHeader)
+			}
+		})
+	}
+}
+
+// TestSubscribeVersionGate verifies the streaming path: a too-old client is refused with
+// FailedPrecondition, while an equal or absent version is admitted and proceeds to auth (which
+// fails Unauthenticated with no session, proving it passed the version gate).
+func TestSubscribeVersionGate(t *testing.T) {
+	noBackend := func(_ http.ResponseWriter, _ *http.Request) {}
+	tests := []struct {
+		name   string
+		min    string
+		header string
+		want   connect.Code
+	}{
+		{"too old refused", "v1.16.0", "v1.0.0", connect.CodeFailedPrecondition},
+		{"equal admitted then auth-gated", "v1.16.0", "v1.16.0", connect.CodeUnauthenticated},
+		{"gate dormant admits", "", "v1.0.0", connect.CodeUnauthenticated},
+	}
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			client, cleanup := newEdgeMin(t, tc.min, noBackend)
+			defer cleanup()
+			req := connect.NewRequest(&edgev1.SubscribeRequest{})
+			if tc.header != "" {
+				req.Header().Set("X-Client-Version", tc.header)
+			}
+			stream, err := client.Subscribe(context.Background(), req)
+			if err == nil {
+				for stream.Receive() {
+				}
+				err = stream.Err()
+			}
+			if got := connect.CodeOf(err); got != tc.want {
+				t.Fatalf("code = %v, want %v", got, tc.want)
+			}
+		})
+	}
+}
+
 func TestExecuteAuthedRequiresSession(t *testing.T) {
 	client, cleanup := newEdge(t, func(w http.ResponseWriter, r *http.Request) {
 		t.Error("backend must not be called without a session")

gateway/internal/ratelimit/ratelimit_test.go

@@ -4,6 +4,7 @@ import (
 	"testing"
 	"time"
 
+	"scrabble/gateway/internal/config"
 	"scrabble/gateway/internal/ratelimit"
 )
 
@@ -44,3 +45,20 @@ func TestPerWindow(t *testing.T) {
 		t.Fatalf("per-window burst = %v, want [true true false]", got)
 	}
 }
+
+// TestEmailBurstAllowsHonestLoginFlow guards the default email-code burst against being
+// tightened back below the honest login sequence: requesting a code, submitting one wrong
+// code, then the correct one are three immediate email-class events from one IP, and all
+// must pass. A burst of 2 denied the correct-code login, which the client mis-read as going
+// offline and could not recover from on the session-less login screen. This is defence in
+// depth over the backend's own per-code attempt cap and code TTL.
+func TestEmailBurstAllowsHonestLoginFlow(t *testing.T) {
+	rl := config.DefaultRateLimit()
+	p := ratelimit.Per(rl.EmailPer10Min, 10*time.Minute, rl.EmailBurst)
+	l := ratelimit.New()
+	for i, want := range []bool{true, true, true} { // request code, wrong code, right code
+		if got := l.Allow("email:198.51.100.7", p); got != want {
+			t.Fatalf("honest email event %d allowed = %v, want %v", i+1, got, want)
+		}
+	}
+}

platform/telegram/README.md

@@ -9,8 +9,9 @@ it. See [`docs/ARCHITECTURE.md`](../../docs/ARCHITECTURE.md) §1/§3/§10/§12/
   validation gRPC API the gateway calls during Telegram auth, on the trusted internal
   network with no VPN. Because it needs no Telegram reachability, **game login stays up
   even when the bot or the bot-link is down**.
-- **`cmd/bot`** (remote) — runs the Bot API long-poll (Mini App launch + `/start`
+- **`cmd/bot`** (remote) — runs the Bot API long-poll (Mini App launch, `/start`
-  deep-links) and `sendMessage`, the only component reaching the Telegram Bot API. It
+  deep-links, the `/support` info reply) and `sendMessage`, the only component reaching
+  the Telegram Bot API. It
   holds **no inbound port**: it dials the gateway over a reverse **mTLS bot-link** and
   executes the send commands the gateway pushes, so its egress can run on a host with
   native Telegram access (a VPN sidecar in the test contour, a separate host in prod).
@@ -49,6 +50,13 @@ Telegram identity to an account from a browser. Both map a rejection to gRPC
   chat" — rather than a dangling "@"). This is otherwise **self-contained**
   — the bot never calls back into the game, so `/start` onboarding works even when the game
   is down.
+- **Support command.** `/support` replies with a fixed support-desk info message — the
+  operators' working hours and what to include (a description and, when possible,
+  screenshots). Like `/start` it answers only in a private chat and is **Russian or
+  English** by the sender's reported language, and it is listed in the bot's command menu
+  (localized, Russian/English). It is a dedicated command handler, so it intercepts
+  `/support` before the support relay below — the command line itself is not forwarded to
+  operators, while the user's following description still is.
 - **Moderated-chat gating.** When `TELEGRAM_CHAT_ID` names a channel's linked discussion
   group, the bot gates who may write there. The group **allows sending by default** (a
   human setting) and the bot only **restricts** — Telegram intersects the chat default with
@@ -62,7 +70,12 @@ Telegram identity to an account from a browser. Both map a rejection to gRPC
   the bot applies it — but only to a member currently in the chat (it probes one user with
   `getChatMember`, since bots cannot list members). The bot must be an **administrator** there
   with the **"Ban users"** right (the Bot API `can_restrict_members`), and it subscribes to
-  `chat_member` updates, which Telegram delivers only to a chat admin.
+  `chat_member` updates, which Telegram delivers only to a chat admin. The bot also **removes
+  the automatic pin** Telegram places on every channel post auto-forwarded into this linked
+  chat (the `Message.is_automatic_forward` marker): it unpins only that one message
+  (`unpinChatMessage` by id), so a pin set by a human admin — or by the bot for another
+  message — is never touched. This needs the **pin-messages** right (`can_pin_messages`) in
+  addition to "Ban users"; a startup self-check warns when it is missing.
 - **Support relay (optional).** When `TELEGRAM_SUPPORT_CHAT_ID` names a private **forum
   supergroup**, the bot runs a direct support channel for users who message it. A user's first
   non-`/start` message opens a dedicated **forum topic** whose first message is an info card (the
@@ -76,7 +89,8 @@ Telegram identity to an account from a browser. Both map a rejection to gRPC
   message. State (user→topic map, block list, relayed ids) is a JSON file under
   `TELEGRAM_SUPPORT_STATE_DIR` on a persistent volume — the bot host has no database. The bot must
   be an **administrator** in the group with the **manage-topics** and **delete-messages** rights.
-  The relay is bot-local (no backend, no bot-link) and the user gets no automatic reply.
+  The relay is bot-local (no backend, no bot-link) and a forwarded message gets no automatic
+  reply (the `/support` command above aside).
 - **Promo bot (optional).** When `TELEGRAM_PROMO_BOT_TOKEN` is set, the container also
   runs a **second, standalone** bot whose only job is to answer `/start` with a localized
   message and a button that opens the **main** bot's Mini App. The button is a **URL** to

platform/telegram/internal/bot/bot.go

@@ -1,6 +1,7 @@
 // Package bot wraps the Telegram Bot API client (github.com/go-telegram/bot): it
 // runs the long-poll update loop — replying to /start (with an optional deep-link
-// payload) and any other message with a Mini App launch button — and sends the
+// payload), to /support with the support-desk info message, and to any other message
+// with a Mini App launch button — and sends the
 // notification and admin messages the connector requests. The bot token lives only
 // in this process.
 package bot
@@ -136,6 +137,7 @@ func New(cfg Config, log *zap.Logger) (*Bot, error) {
 	opts := []tgbot.Option{
 		tgbot.WithDefaultHandler(t.handleUpdate),
 		tgbot.WithMessageTextHandler("/start", tgbot.MatchTypePrefix, t.handleStart),
+		tgbot.WithMessageTextHandler("/support", tgbot.MatchTypePrefix, t.handleSupport),
 	}
 	if t.supportEnabled() {
 		t.supportLocks = newKeyedMutex()
@@ -186,11 +188,26 @@ func New(cfg Config, log *zap.Logger) (*Bot, error) {
 // Run sets the bot commands and the Mini App menu button, then blocks on the
 // long-poll update loop until ctx is cancelled.
 func (t *Bot) Run(ctx context.Context) {
+	// Command menu: the default (fallback) list is English; a Russian-scoped list
+	// localises the labels for ru clients. A language scope replaces the whole list, so
+	// it repeats /start with its own Russian label.
 	if _, err := t.api.SetMyCommands(ctx, &tgbot.SetMyCommandsParams{
-		Commands: []models.BotCommand{{Command: "start", Description: "Open Scrabble"}},
+		Commands: []models.BotCommand{
+			{Command: "start", Description: "Play Scrabble"},
+			{Command: "support", Description: "Contact the administration"},
+		},
 	}); err != nil {
 		t.log.Warn("set commands failed", zap.Error(err))
 	}
+	if _, err := t.api.SetMyCommands(ctx, &tgbot.SetMyCommandsParams{
+		LanguageCode: "ru",
+		Commands: []models.BotCommand{
+			{Command: "start", Description: "Играть в «Эрудита»"},
+			{Command: "support", Description: "Связаться с администрацией"},
+		},
+	}); err != nil {
+		t.log.Warn("set ru commands failed", zap.Error(err))
+	}
 	if _, err := t.api.SetChatMenuButton(ctx, &tgbot.SetChatMenuButtonParams{
 		MenuButton: models.MenuButtonWebApp{
 			Type:   models.MenuButtonTypeWebApp,
@@ -268,6 +285,12 @@ func (t *Bot) logChatAdminStatus(ctx context.Context) {
 		return
 	}
 	t.log.Info("chat gating ready: bot is an admin with the restrict-members right", zap.Int64("chat_id", t.chatID))
+	// The same moderated chat also gets the linked channel's auto-forwarded posts un-pinned,
+	// which needs the pin-messages right; warn (separately from gating) when it is missing.
+	if !m.Administrator.CanPinMessages {
+		t.log.Warn("auto-unpin of linked channel posts WILL NOT WORK: the bot lacks the pin-messages right",
+			zap.Int64("chat_id", t.chatID))
+	}
 }
 
 // Notify sends a notification message with a Mini App launch button that opens the
@@ -388,6 +411,14 @@ func (t *Bot) handleUpdate(ctx context.Context, api *tgbot.Bot, update *models.U
 		t.handleSuccessfulPayment(ctx, update.Message)
 		return
 	}
+	// A channel post automatically forwarded into the moderated discussion chat is
+	// auto-pinned by Telegram (a non-disableable behaviour). Unpin that one message so only
+	// deliberate pins remain; it targets this exact message id, so a pin set by a human admin
+	// — or by the bot for another message — is never touched.
+	if m := update.Message; m != nil && m.IsAutomaticForward && t.chatID != 0 && m.Chat.ID == t.chatID {
+		t.handleLinkedChannelPin(ctx, m)
+		return
+	}
 	// Support relay (when enabled): a non-/start message — /start has its own handler —
 	// is either an operator's reply in the support chat or a user's direct message to
 	// relay. Everything else falls through to the Mini App launch reply.
@@ -404,6 +435,24 @@ func (t *Bot) handleUpdate(ctx context.Context, api *tgbot.Bot, update *models.U
 	t.handleStart(ctx, api, update)
 }
 
+// handleLinkedChannelPin removes Telegram's automatic pin from a linked channel's post
+// that was auto-forwarded into the moderated discussion chat. It unpins only that exact
+// message (by id), so a pin set by a human admin — or by the bot for another message — is
+// left untouched. It needs the bot to hold the pin-messages right in the chat; a missing
+// right surfaces as a warning (the unpin then no-ops), not a crash.
+func (t *Bot) handleLinkedChannelPin(ctx context.Context, m *models.Message) {
+	if _, err := t.api.UnpinChatMessage(ctx, &tgbot.UnpinChatMessageParams{
+		ChatID:    m.Chat.ID,
+		MessageID: m.ID,
+	}); err != nil {
+		t.log.Warn("could not unpin an auto-forwarded channel post; does the bot have the pin-messages right?",
+			zap.Int64("chat_id", m.Chat.ID), zap.Int("message_id", m.ID), zap.Error(err))
+		return
+	}
+	t.log.Debug("unpinned an auto-forwarded channel post",
+		zap.Int64("chat_id", m.Chat.ID), zap.Int("message_id", m.ID))
+}
+
 // SetEligibilityResolver wires the chat-eligibility resolver after construction (the
 // bot-link client backing it is built after the bot).
 func (t *Bot) SetEligibilityResolver(resolve EligibilityResolver) {

platform/telegram/internal/bot/chat_test.go

@@ -19,10 +19,11 @@ const (
 )
 
 // chatAPI is a fake Bot API for the chat-gating tests: it answers getMe, returns a
-// scripted getChatMember status, and records restrictChatMember calls.
+// scripted getChatMember status, and records restrictChatMember and unpinChatMessage calls.
 type chatAPI struct {
 	memberStatus string // the status getChatMember reports (default "left")
 	restricts    []restrictCall
+	unpins       []unpinCall
 }
 
 type restrictCall struct {
@@ -30,6 +31,13 @@ type restrictCall struct {
 	canSend bool // can_send_messages in the applied permissions
 }
 
+// unpinCall records a single unpinChatMessage request (raw form values, mirroring the
+// restrictCall style).
+type unpinCall struct {
+	chatID    string
+	messageID string
+}
+
 func (a *chatAPI) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	switch {
 	case strings.HasSuffix(r.URL.Path, "/getMe"):
@@ -47,6 +55,9 @@ func (a *chatAPI) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		_ = json.Unmarshal([]byte(r.FormValue("permissions")), &perms)
 		a.restricts = append(a.restricts, restrictCall{userID: r.FormValue("user_id"), canSend: perms.CanSendMessages})
 		io.WriteString(w, `{"ok":true,"result":true}`)
+	case strings.HasSuffix(r.URL.Path, "/unpinChatMessage"):
+		a.unpins = append(a.unpins, unpinCall{chatID: r.FormValue("chat_id"), messageID: r.FormValue("message_id")})
+		io.WriteString(w, `{"ok":true,"result":true}`)
 	default:
 		io.WriteString(w, `{"ok":true,"result":true}`)
 	}
@@ -237,3 +248,44 @@ func TestApplyChatGateSkipsAbsentAndAdmin(t *testing.T) {
 		})
 	}
 }
+
+// autoForwardUpdate builds a message update as it lands in the discussion chat: a post in
+// chat chatID with id msgID and is_automatic_forward set to auto.
+func autoForwardUpdate(chatID int64, msgID int, auto bool) *models.Update {
+	return &models.Update{Message: &models.Message{
+		ID:                 msgID,
+		Chat:               models.Chat{ID: chatID, Type: models.ChatTypeSupergroup},
+		IsAutomaticForward: auto,
+	}}
+}
+
+func TestAutoForwardUnpinned(t *testing.T) {
+	// A channel post auto-forwarded into the moderated chat is unpinned by its exact id.
+	api := &chatAPI{}
+	b := newChatBot(t, api)
+	b.handleUpdate(context.Background(), b.api, autoForwardUpdate(testChatID, 42, true))
+	if len(api.unpins) != 1 || api.unpins[0].chatID != "555" || api.unpins[0].messageID != "42" {
+		t.Fatalf("unpins = %+v, want one {555, 42}", api.unpins)
+	}
+}
+
+func TestNonAutoForwardNotUnpinned(t *testing.T) {
+	// A normal message in the moderated chat (e.g. another admin's pinned message) is never
+	// unpinned — the is_automatic_forward filter is what guards every other pin.
+	api := &chatAPI{}
+	b := newChatBot(t, api)
+	b.handleUpdate(context.Background(), b.api, autoForwardUpdate(testChatID, 42, false))
+	if len(api.unpins) != 0 {
+		t.Fatalf("unpins = %+v, want none for a non-auto-forward message", api.unpins)
+	}
+}
+
+func TestAutoForwardOtherChatIgnored(t *testing.T) {
+	// An auto-forward in some other chat (not the configured moderated one) is ignored.
+	api := &chatAPI{}
+	b := newChatBot(t, api)
+	b.handleUpdate(context.Background(), b.api, autoForwardUpdate(999, 42, true))
+	if len(api.unpins) != 0 {
+		t.Fatalf("unpins = %+v, want none for a foreign chat", api.unpins)
+	}
+}

platform/telegram/internal/bot/supportreply.go

@@ -0,0 +1,63 @@
+package bot
+
+import (
+	"context"
+	"strings"
+
+	tgbot "github.com/go-telegram/bot"
+	"github.com/go-telegram/bot/models"
+	"go.uber.org/zap"
+)
+
+// The /support command replies with a fixed support-desk info message — the operators'
+// working hours and what to include (a description and, when possible, screenshots). It
+// is a dedicated command handler (registered like /start), so it intercepts "/support"
+// before the support relay: the command line itself is not forwarded into an operator
+// topic, while the user's following description still is.
+
+// handleSupport replies to /support with the localized support-desk info message. Like
+// handleStart it answers only in a private chat — in the moderated group the bot never
+// chats — and it sends a plain text message with no launch button.
+func (t *Bot) handleSupport(ctx context.Context, api *tgbot.Bot, update *models.Update) {
+	if update.Message == nil {
+		return
+	}
+	if update.Message.Chat.Type != models.ChatTypePrivate {
+		return
+	}
+	// The sender's Telegram language rides on the message itself (Message.from.language_code);
+	// fall back to English when it is absent, matching startText.
+	lang := ""
+	if update.Message.From != nil {
+		lang = update.Message.From.LanguageCode
+	}
+	if _, err := api.SendMessage(ctx, &tgbot.SendMessageParams{
+		ChatID: update.Message.Chat.ID,
+		Text:   supportText(lang),
+	}); err != nil {
+		t.log.Warn("reply to support failed", zap.Error(err))
+	}
+}
+
+// supportText returns the localized /support reply. Russian is used when lang (the IETF
+// language tag the Telegram client reports on the message's sender) starts with "ru",
+// English otherwise and when it is absent — mirroring startText's language choice.
+func supportText(lang string) string {
+	if strings.HasPrefix(strings.ToLower(lang), "ru") {
+		return ruSupport
+	}
+	return enSupport
+}
+
+// ruSupport and enSupport are the Russian and English /support replies; the English one
+// is the fallback for any non-Russian or missing sender language.
+const (
+	ruSupport = "Поддержка «Эрудита» на связи с 08:00 до 18:00 (по времени UTC). " +
+		"Если Вы столкнулись с проблемой, подробно опишите её и добавьте, по возможности, скриншоты. " +
+		"Также будем рады выслушать Ваши пожелания и предложения по функционалу игры. " +
+		"Ответим в самое ближайшее время."
+	enSupport = "“Erudite” support is available from 08:00 to 18:00 (UTC). " +
+		"If you have run into a problem, please describe it in detail and attach screenshots if you can. " +
+		"We would also be glad to hear your wishes and suggestions about the game's features. " +
+		"We will reply as soon as possible."
+)

platform/telegram/internal/bot/supportreply_test.go

@@ -0,0 +1,51 @@
+package bot
+
+import (
+	"context"
+	"strings"
+	"testing"
+
+	"github.com/go-telegram/bot/models"
+)
+
+func TestHandleSupportRepliesPrivateOnly(t *testing.T) {
+	t.Run("english by default", func(t *testing.T) {
+		api := &fakeBotAPI{}
+		b := newTestBot(t, api)
+		b.handleSupport(context.Background(), b.api, &models.Update{Message: &models.Message{
+			Chat: models.Chat{ID: 42, Type: models.ChatTypePrivate}, Text: "/support",
+		}})
+		if api.chatID != "42" {
+			t.Errorf("chat_id = %q, want 42", api.chatID)
+		}
+		// No reported language -> English support reply.
+		if !strings.Contains(api.text, "support is available") {
+			t.Errorf("text = %q, want the English support reply", api.text)
+		}
+		// A plain info message carries no launch button.
+		if api.replyMarkup != "" {
+			t.Errorf("reply_markup = %q, want none", api.replyMarkup)
+		}
+	})
+	t.Run("russian for a ru sender", func(t *testing.T) {
+		api := &fakeBotAPI{}
+		b := newTestBot(t, api)
+		b.handleSupport(context.Background(), b.api, &models.Update{Message: &models.Message{
+			Chat: models.Chat{ID: 42, Type: models.ChatTypePrivate}, Text: "/support",
+			From: &models.User{ID: 7, LanguageCode: "ru"},
+		}})
+		if !strings.Contains(api.text, "Поддержка «Эрудита»") {
+			t.Errorf("text = %q, want the Russian support reply", api.text)
+		}
+	})
+	t.Run("group ignored", func(t *testing.T) {
+		api := &fakeBotAPI{}
+		b := newTestBot(t, api)
+		b.handleSupport(context.Background(), b.api, &models.Update{Message: &models.Message{
+			Chat: models.Chat{ID: -100, Type: models.ChatTypeSupergroup}, Text: "/support",
+		}})
+		if api.chatID != "" {
+			t.Errorf("group /support got a reply (chat=%q); the bot never chats in the group", api.chatID)
+		}
+	})
+}

renderer/Dockerfile

@@ -23,10 +23,11 @@ ENV APP_VERSION=${VERSION}
 WORKDIR /app
 COPY --from=build /src/renderer/node_modules ./node_modules
 COPY --from=build /src/renderer/dist ./dist
-COPY renderer/src/server.mjs renderer/src/render.mjs renderer/src/offer.mjs ./src/
+COPY renderer/src/server.mjs renderer/src/render.mjs renderer/src/offer.mjs renderer/src/legal.mjs ./src/
-# The public-offer prose (GET /offer/): the owner-edited markdown, read once at boot. The dynamic
+# The public legal pages: the owner-edited markdown, read once at boot. GET /offer/ also splices in
-# price list is fetched from the backend at request time and spliced in.
+# the live price list fetched from the backend at request time; GET /privacy/ and GET /eula/ are
-COPY ui/legal/offer_ru.md ./legal/offer_ru.md
+# static (no dynamic data).
+COPY ui/legal/offer_ru.md ui/legal/offer_en.md ui/legal/privacy_ru.md ui/legal/privacy_en.md ui/legal/eula_ru.md ui/legal/eula_en.md ./legal/
 USER node
 EXPOSE 8090
 CMD ["node", "src/server.mjs"]

renderer/README.md

@@ -1,10 +1,11 @@
-# renderer — the render sidecar (finished-game image + public offer page)
+# renderer — the render sidecar (finished-game image + public legal pages)
 
 An internal Node service that runs shared `ui/src/lib` renderers server-side — bundled verbatim at
 image build time (`src/entry.ts` → esbuild → `dist/gameimage.mjs`) so there is one renderer and no
 drift from the browser. It serves two surfaces: the finished-game export **PNG** (on
 [skia-canvas](https://github.com/samizdatco/skia-canvas), pixel-identical to the design the owner
-signed off) and the public **offer page**.
+signed off) and the public **legal pages** (the offer, the privacy policy and the EULA), each
+bilingual (RU + EN) with a language + theme switcher.
 
 ## Interface
 
@@ -16,9 +17,16 @@ signed off) and the public **offer page**.
 - `GET /offer/` — the public offer page as `text/html`: the owner-edited `ui/legal/offer_ru.md`
   (baked into the image, read at boot) with the live catalog **price list** (§4.4) fetched as
   markdown from the backend's internal `/api/v1/internal/offer/pricing` (`RENDERER_BACKEND_URL`)
-  and spliced in at the `<#pricing_template#>` marker, then rendered by the shared
+  and spliced in at the `<#pricing_template#>` marker of both language sources (`offer_ru.md` /
-  `ui/src/lib/offer.ts`. `GET /offer` → 301 `/offer/`. **The only edge-exposed route** — caddy
+  `offer_en.md`), then rendered as one bilingual page by the shared `ui/src/lib/offer.ts`
-  routes `/offer/` here; a backend outage yields a 502, never a stale price list.
+  `renderLegalHtml` (the English view transliterates the Russian product names client-side).
+  `GET /offer` → 301 `/offer/`. Caddy routes `/offer/` here; a backend outage yields a 502, never a
+  stale price list.
+- `GET /privacy/` — the privacy policy, and `GET /eula/` the end-user licence agreement, both as
+  `text/html`: the owner-edited `ui/legal/{privacy,eula}_{ru,en}.md` (baked in, read at boot),
+  rendered once at boot as one bilingual page by the same shared `renderLegalHtml` and served from
+  cache. **Static** — no backend fetch. `GET /privacy` / `GET /eula` → 301 to the trailing-slash
+  form. Caddy routes these here too.
 - `GET /healthz` — liveness (the compose healthcheck the backend's `depends_on` gates on).
 
 The service renders and nothing else: for the PNG, authentication, the participant check and the
@@ -32,10 +40,14 @@ page.
 ```sh
 pnpm install          # skia-canvas + esbuild MUST stay approved in pnpm-workspace.yaml
                       # (allowBuilds) or the native binary is silently never fetched
-pnpm test             # bundles, then node --test (PNG smoke + offer splice)
+pnpm test             # bundles, then node --test (PNG smoke + offer/legal render)
-# local run on :8090 (RENDERER_PORT overrides). For /offer/, point at the offer source and a
+# local run on :8090 (RENDERER_PORT overrides). The server reads all three legal sources at boot, so
-# reachable backend (else the boot read / the price fetch fail):
+# point each at its ui/legal source (the baked paths do not exist in a local checkout); /offer/ also
-RENDERER_OFFER_MD=../ui/legal/offer_ru.md RENDERER_BACKEND_URL=http://localhost:8080 node src/server.mjs
+# needs a reachable backend for the price fetch:
+RENDERER_OFFER_MD=../ui/legal/offer_ru.md RENDERER_OFFER_EN_MD=../ui/legal/offer_en.md \
+  RENDERER_PRIVACY_MD=../ui/legal/privacy_ru.md RENDERER_PRIVACY_EN_MD=../ui/legal/privacy_en.md \
+  RENDERER_EULA_MD=../ui/legal/eula_ru.md RENDERER_EULA_EN_MD=../ui/legal/eula_en.md \
+  RENDERER_BACKEND_URL=http://localhost:8080 node src/server.mjs
 ```
 
 The runtime image (`renderer/Dockerfile`, `node:22-slim`) bakes in Liberation Sans (the

renderer/src/entry.ts

@@ -2,8 +2,9 @@
 // browser build unit-tests — so the sidecar runs them on the server. Bundled by `pnpm run bundle`
 // into dist/gameimage.mjs (type erasure only; the ui project type-checks the source):
 //   - drawGameImage + setAlphabet: the finished-game PNG export (POST /render).
-//   - renderOfferHtml: the public-offer page (GET /offer/) — the same renderer the landing build
+//   - renderOfferHtml / renderLegalHtml: the public legal pages — GET /offer/ (with the live
-//     used to invoke, now server-side so the live catalog price list can be spliced in.
+//     catalog price list spliced in), GET /privacy/ and GET /eula/ (static) — server-side so one
+//     renderer serves them all.
 export { drawGameImage, type RenderOptions } from '../../ui/src/lib/gameimage';
 export { setAlphabet } from '../../ui/src/lib/alphabet';
-export { renderOfferHtml } from '../../ui/src/lib/offer';
+export { renderOfferHtml, renderLegalHtml } from '../../ui/src/lib/offer';

renderer/src/legal.mjs

@@ -0,0 +1,24 @@
+// The public legal pages (GET /privacy/, GET /eula/): the owner-edited RU + EN markdown under
+// ui/legal/, rendered by the SAME shared renderLegalHtml the offer uses (bundled from ui/src/lib/offer)
+// into one bilingual page with a language + theme switcher. Unlike the offer, these carry no dynamic
+// data — no backend fetch, no marker splice. Kept out of server.mjs so the per-page title/canonical
+// presets are unit-testable without HTTP (test/legal.test.mjs).
+import { renderLegalHtml } from '../dist/gameimage.mjs';
+
+// renderPrivacy renders the privacy-policy markdown (RU + EN) as the standalone /privacy/ page.
+export function renderPrivacy(ruMd, enMd) {
+  return renderLegalHtml({
+    ru: { md: ruMd, title: 'Политика конфиденциальности — Эрудит' },
+    en: { md: enMd, title: 'Privacy Policy — Erudit' },
+    canonical: 'https://erudit-game.ru/privacy/',
+  });
+}
+
+// renderEula renders the end-user licence agreement markdown (RU + EN) as the standalone /eula/ page.
+export function renderEula(ruMd, enMd) {
+  return renderLegalHtml({
+    ru: { md: ruMd, title: 'Пользовательское соглашение — Эрудит' },
+    en: { md: enMd, title: 'Terms of Use — Erudit' },
+    canonical: 'https://erudit-game.ru/eula/',
+  });
+}

renderer/src/offer.mjs

@@ -1,17 +1,21 @@
-// The public-offer page renderer: splices the live catalog price list into the owner-edited offer
+// The public-offer page renderer: splices the live catalog price list into BOTH language sources of
-// markdown and renders it with the SAME renderOfferHtml the landing build used to invoke (bundled
+// the owner-edited offer markdown at the pricing marker, and renders the bilingual /offer/ page with
-// from ui/src/lib/offer). Kept out of server.mjs so the substitution is unit-testable without HTTP.
+// the SAME renderOfferHtml the browser build uses (bundled from ui/src/lib/offer). The English view
+// transliterates the Russian product names client-side (renderLegalHtml). Kept out of server.mjs so
+// the substitution is unit-testable without HTTP.
 import { renderOfferHtml } from '../dist/gameimage.mjs';
 
-// pricingMarker is the token ui/legal/offer_ru.md carries at §4.4 where the price list belongs. It
+// pricingMarker is the token ui/legal/offer_{ru,en}.md carry at §4.4 where the price list belongs. It
 // mirrors the backend marker (backend/internal/payments/offer.go) and is replaced with the fetched
 // tables before rendering.
 export const pricingMarker = '<#pricing_template#>';
 
-// renderOffer returns the standalone /offer/ HTML: the offer markdown with the pricing marker
+// renderOffer returns the standalone /offer/ HTML: the RU + EN offer markdown with the pricing marker
 // replaced by pricingTables (the two markdown tables the backend projects from the active catalog),
-// rendered to a self-contained document. The replacement is literal (a function replacer) so a "$"
+// rendered to a self-contained bilingual document. The replacement is literal (a function replacer)
-// in a product title is never read as a replacement pattern; a missing marker leaves the text as is.
+// so a "$" in a product title is never read as a replacement pattern; a missing marker leaves the
-export function renderOffer(offerMarkdown, pricingTables) {
+// text as is.
-  return renderOfferHtml(offerMarkdown.replace(pricingMarker, () => pricingTables));
+export function renderOffer(ruMarkdown, enMarkdown, pricingTables) {
+  const splice = (md) => md.replace(pricingMarker, () => pricingTables);
+  return renderOfferHtml(splice(ruMarkdown), splice(enMarkdown));
 }

renderer/src/server.mjs

@@ -3,28 +3,43 @@
 //
 //   POST /render  {game, moves, alphabet, labels, dateLocale, hostname, scale?} → image/png
 //   GET  /offer/   → text/html (the public offer page: ui/legal/offer_ru.md with the live catalog
-//                   price list spliced in — the only edge-exposed route; caddy routes /offer/ here)
+//                    price list spliced in; caddy routes /offer/ here)
-//   GET  /offer   → 301 /offer/
+//   GET  /privacy/ → text/html (the privacy policy: ui/legal/privacy_ru.md, static)
+//   GET  /eula/    → text/html (the EULA: ui/legal/eula_ru.md, static)
+//   GET  /offer, /privacy, /eula → 301 to the trailing-slash form
 //   GET  /healthz  → 200
 //
 // /render is internal-only (the backend calls it; authentication, participant checks and the signed
-// public URL live in the backend). /offer/ is reachable from the edge but read-only and unprivileged
+// public URL live in the backend). The legal pages (/offer/, /privacy/, /eula/) are reachable from the
-// — it fetches the price list from the backend's internal endpoint and renders the committed offer
+// edge but read-only and unprivileged: /offer/ splices the price list fetched from the backend's
-// markdown; no user input reaches it.
+// internal endpoint into the committed offer markdown; /privacy/ and /eula/ are static committed
+// markdown. No user input reaches any of them.
 import { createServer } from 'node:http';
 import { readFileSync } from 'node:fs';
 import { renderRequest } from './render.mjs';
 import { renderOffer } from './offer.mjs';
+import { renderPrivacy, renderEula } from './legal.mjs';
 
 const PORT = Number(process.env.RENDERER_PORT || 8090);
 // A render request is a finished game's journal — generously capped.
 const MAX_BODY = 2 * 1024 * 1024;
 
-// The offer prose is baked into the image (renderer/Dockerfile) and read once at boot; only the
+// Each legal page is bilingual (RU + EN); both markdown sources are baked into the image
-// price list is dynamic (fetched per request). The backend endpoint is internal (off the edge
+// (renderer/Dockerfile) and read once at boot. The offer's price list is the only dynamic part
-// allow-list) and serves the tables from its in-memory cache. RENDERER_OFFER_MD overrides the baked
+// (fetched per request from the backend's internal endpoint and spliced in); privacy + eula carry no
-// path for a local run (point it at ../ui/legal/offer_ru.md).
+// dynamic data. The RENDERER_*_MD / RENDERER_*_EN_MD env vars override the baked paths for a local run.
-const OFFER_MD = readFileSync(process.env.RENDERER_OFFER_MD || new URL('../legal/offer_ru.md', import.meta.url), 'utf8');
+const rd = (p) => readFileSync(p, 'utf8');
+const OFFER_MD = rd(process.env.RENDERER_OFFER_MD || new URL('../legal/offer_ru.md', import.meta.url));
+const OFFER_EN_MD = rd(process.env.RENDERER_OFFER_EN_MD || new URL('../legal/offer_en.md', import.meta.url));
+const PRIVACY_MD = rd(process.env.RENDERER_PRIVACY_MD || new URL('../legal/privacy_ru.md', import.meta.url));
+const PRIVACY_EN_MD = rd(process.env.RENDERER_PRIVACY_EN_MD || new URL('../legal/privacy_en.md', import.meta.url));
+const EULA_MD = rd(process.env.RENDERER_EULA_MD || new URL('../legal/eula_ru.md', import.meta.url));
+const EULA_EN_MD = rd(process.env.RENDERER_EULA_EN_MD || new URL('../legal/eula_en.md', import.meta.url));
+// Render the static legal pages once at boot and serve the cached HTML: re-parsing the large EULA on
+// every request is slow enough under deploy-time host contention (the renderer is CPU/memory-capped)
+// to flake the contour probe. The offer stays per-request because it splices in the live price list.
+const PRIVACY_HTML = renderPrivacy(PRIVACY_MD, PRIVACY_EN_MD);
+const EULA_HTML = renderEula(EULA_MD, EULA_EN_MD);
 const OFFER_PRICING_URL =
   (process.env.RENDERER_BACKEND_URL || 'http://backend:8080') + '/api/v1/internal/offer/pricing';
 
@@ -68,12 +83,28 @@ const server = createServer(async (req, res) => {
       return;
     }
     if (req.method === 'GET' && path === '/offer/') {
-      const html = renderOffer(OFFER_MD, await fetchOfferPricing());
+      const html = renderOffer(OFFER_MD, OFFER_EN_MD, await fetchOfferPricing());
       res
         .writeHead(200, { 'content-type': 'text/html; charset=utf-8', 'cache-control': 'no-cache' })
         .end(html);
       return;
     }
+    if (req.method === 'GET' && (path === '/privacy' || path === '/eula')) {
+      res.writeHead(301, { location: path + '/' }).end();
+      return;
+    }
+    if (req.method === 'GET' && path === '/privacy/') {
+      res
+        .writeHead(200, { 'content-type': 'text/html; charset=utf-8', 'cache-control': 'no-cache' })
+        .end(PRIVACY_HTML);
+      return;
+    }
+    if (req.method === 'GET' && path === '/eula/') {
+      res
+        .writeHead(200, { 'content-type': 'text/html; charset=utf-8', 'cache-control': 'no-cache' })
+        .end(EULA_HTML);
+      return;
+    }
     if (req.method === 'POST' && path === '/render') {
       const png = await renderRequest(JSON.parse(await readBody(req)));
       res.writeHead(200, { 'content-type': 'image/png', 'content-length': png.length }).end(png);

renderer/test/legal.test.mjs

@@ -0,0 +1,27 @@
+// Unit test for the static legal pages: renderPrivacy / renderEula wrap the owner-edited RU + EN
+// markdown in the shared bilingual legal-page chrome (bundled renderLegalHtml) with the right title +
+// canonical URL and no dynamic data. The prose rendering itself is unit-tested in ui/ (offer.test.ts);
+// here we assert the per-page presets and that both languages reach the document.
+import test from 'node:test';
+import assert from 'node:assert/strict';
+import { renderPrivacy, renderEula } from '../src/legal.mjs';
+
+test('renderPrivacy wraps the RU + EN markdown in the privacy-page chrome', () => {
+  const html = renderPrivacy(
+    '# Политика конфиденциальности\n\n**1.1.** ИНН 290210610742.',
+    '# Privacy Policy\n\n**1.1.** TIN 290210610742.',
+  );
+  assert.ok(html.includes('<!doctype html>'), 'a standalone document');
+  assert.ok(html.includes('<title>Политика конфиденциальности — Эрудит</title>'), 'the privacy title');
+  assert.ok(html.includes('data-title-en="Privacy Policy — Erudit"'), 'the English title for the toggle');
+  assert.ok(html.includes('href="https://erudit-game.ru/privacy/"'), 'the privacy canonical URL');
+  assert.ok(html.includes('290210610742'), 'the prose reached the document');
+  assert.ok(html.includes('<main data-lang="en" hidden>'), 'the English body is present, hidden by default');
+});
+
+test('renderEula wraps the RU + EN markdown in the EULA-page chrome', () => {
+  const html = renderEula('# Лицензионное соглашение\n\nтекст', '# Terms of Use\n\ntext');
+  assert.ok(html.includes('<title>Пользовательское соглашение — Эрудит</title>'), 'the EULA title');
+  assert.ok(html.includes('data-title-en="Terms of Use — Erudit"'), 'the English title for the toggle');
+  assert.ok(html.includes('href="https://erudit-game.ru/eula/"'), 'the EULA canonical URL');
+});

renderer/test/offer.test.mjs

@@ -1,7 +1,7 @@
-// Unit test for the public-offer page assembly: renderOffer splices the backend's price-list
+// Unit test for the public-offer page assembly: renderOffer splices the backend's price-list markdown
-// markdown into the offer at the pricing marker and renders it with the shared renderOfferHtml
+// into BOTH language sources of the offer at the pricing marker and renders them with the shared
-// (bundled from ui/src/lib/offer). The prose rendering itself is unit-tested in ui/ (offer.test.ts);
+// renderOfferHtml (bundled from ui/src/lib/offer). The prose rendering itself is unit-tested in ui/
-// here we assert the substitution and that the tables reach the rendered HTML.
+// (offer.test.ts); here we assert the substitution reaches both languages and the tables render.
 import test from 'node:test';
 import assert from 'node:assert/strict';
 import { renderOffer, pricingMarker } from '../src/offer.mjs';
@@ -11,19 +11,21 @@ const tables =
   '| --- | --- | --- | --- |\n' +
   '| 50 «Фишек» | 200.00 | 30 | 100 |';
 
-test('splices the price list into the offer and renders the tables to HTML', () => {
+test('splices the price list into both language sources and renders the tables', () => {
-  const md = `# Публичная оферта\n\n**4.4.** Стоимость Товаров:\n\n${pricingMarker}\n`;
+  const ru = `# Публичная оферта\n\n**4.4.** Стоимость Товаров:\n\n${pricingMarker}\n`;
-  const html = renderOffer(md, tables);
+  const en = `# Public offer\n\n**4.4.** Cost of the Goods:\n\n${pricingMarker}\n`;
-  // The marker is gone and the projected table reached the document as a real HTML table.
+  const html = renderOffer(ru, en, tables);
-  assert.ok(!html.includes(pricingMarker), 'pricing marker must be substituted');
+  // The marker is gone from both languages and the projected table reached the document.
+  assert.ok(!html.includes(pricingMarker), 'the pricing marker must be substituted in both languages');
   assert.ok(html.includes('<table>'), 'the price list must render as an HTML table');
   assert.ok(html.includes('<td>200.00</td>'), 'a rouble price cell must be present');
   assert.ok(html.includes('50 «Фишек»'), 'the product title must be present');
-  // The offer chrome from the shared renderer is intact.
+  assert.ok(html.includes('<h1>Публичная оферта</h1>'), 'the Russian heading rendered');
+  assert.ok(html.includes('<h1>Public offer</h1>'), 'the English heading rendered');
   assert.ok(html.includes('<!doctype html>'));
 });
 
 test('a "$" in a title is substituted literally, not as a replacement pattern', () => {
-  const html = renderOffer(`x ${pricingMarker} y`, '| $5 pack | 1 |');
+  const html = renderOffer(`ru ${pricingMarker}`, `en ${pricingMarker}`, '| $5 pack | 1 |');
   assert.ok(html.includes('$5 pack'), 'a "$" in the tables must survive substitution');
 });

ui/README.md

@@ -31,6 +31,11 @@ enables the "Link Telegram" web sign-in (the Login Widget) — inert until the s
 domain is registered with BotFather (`/setdomain`); `VITE_TELEGRAM_LINK` is the
 friend-invite Mini App link for the single bot (full URL `https://t.me/<bot>/<app>`).
 `VITE_TELEGRAM_GAME_CHANNEL_NAME` is the "Play in Telegram" link shown on the landing page.
+The **native (Capacitor) build** additionally reads `VITE_DICT_VERSION` (the bundled-dictionary version
+the offline path requests, matching the packaged DAWGs), `VITE_PAYMENTS_DISABLED=1` (hide in-app purchases
+in the RuStore MVP), `VITE_RUSTORE_URL` (the update overlay's store target; empty until published) and
+`VITE_APP_VERSION` (`git describe --tags` → the `X-Client-Version` gate header) — all wired by
+`.gitea/workflows/android-build.yaml`.
 
 The build has **two entries**: the game SPA (`index.html`, served at `/app/` and
 `/telegram/`) and a lightweight landing page (`landing.html`, served at `/`).

ui/android/.gitignore

@@ -0,0 +1,101 @@
+# Using Android gitignore template: https://github.com/github/gitignore/blob/HEAD/Android.gitignore
+
+# Built application files
+*.apk
+*.aar
+*.ap_
+*.aab
+
+# Files for the ART/Dalvik VM
+*.dex
+
+# Java class files
+*.class
+
+# Generated files
+bin/
+gen/
+out/
+#  Uncomment the following line in case you need and you don't have the release build type files in your app
+# release/
+
+# Gradle files
+.gradle/
+build/
+
+# Local configuration file (sdk path, etc)
+local.properties
+
+# Proguard folder generated by Eclipse
+proguard/
+
+# Log Files
+*.log
+
+# Android Studio Navigation editor temp files
+.navigation/
+
+# Android Studio captures folder
+captures/
+
+# IntelliJ
+*.iml
+.idea/workspace.xml
+.idea/tasks.xml
+.idea/gradle.xml
+.idea/assetWizardSettings.xml
+.idea/dictionaries
+.idea/libraries
+# Android Studio 3 in .gitignore file.
+.idea/caches
+.idea/modules.xml
+# Comment next line if keeping position of elements in Navigation Editor is relevant for you
+.idea/navEditor.xml
+
+# Keystore files
+# Release signing material must never be committed (keystore loss/leak risk).
+*.jks
+*.keystore
+
+# External native build folder generated in Android Studio 2.2 and later
+.externalNativeBuild
+.cxx/
+
+# Google Services (e.g. APIs or Firebase)
+# google-services.json
+
+# Freeline
+freeline.py
+freeline/
+freeline_project_description.json
+
+# fastlane
+fastlane/report.xml
+fastlane/Preview.html
+fastlane/screenshots
+fastlane/test_output
+fastlane/readme.md
+
+# Version control
+vcs.xml
+
+# lint
+lint/intermediates/
+lint/generated/
+lint/outputs/
+lint/tmp/
+# lint/reports/
+
+# Android Profiling
+*.hprof
+
+# Cordova plugins for Capacitor
+capacitor-cordova-android-plugins
+
+# Copied web assets
+app/src/main/assets/public
+
+# Generated Config files
+app/src/main/assets/capacitor.config.json
+app/src/main/assets/capacitor.plugins.json
+app/src/main/res/xml/config.xml

ui/android/app/.gitignore

@@ -0,0 +1,2 @@
+/build/*
+!/build/.npmkeep

ui/android/app/build.gradle

@@ -0,0 +1,81 @@
+apply plugin: 'com.android.application'
+
+android {
+    namespace = "ru.eruditgame.app"
+    compileSdk = rootProject.ext.compileSdkVersion
+
+    // Release signing is supplied by the android-build CI workflow via env: it decodes the keystore
+    // secret to a file and points ANDROID_KEYSTORE_FILE at it. A local build or a keyless CI run leaves
+    // it unset, so the release APK is produced UNSIGNED rather than failing — assembleDebug and
+    // assembleRelease both build without the keystore. The keystore is never committed (see .gitignore).
+    def keystoreFile = System.getenv('ANDROID_KEYSTORE_FILE')
+    def hasKeystore = keystoreFile != null && !keystoreFile.isEmpty() && file(keystoreFile).exists()
+
+    defaultConfig {
+        applicationId "ru.eruditgame.app"
+        minSdkVersion rootProject.ext.minSdkVersion
+        targetSdkVersion rootProject.ext.targetSdkVersion
+        // Deterministic from the release tag by the android-build workflow (vMA.MI.PA ->
+        // MA*1_000_000 + MI*1_000 + PA); the defaults keep a local assembleDebug building.
+        versionCode = (project.findProperty('versionCode') ?: '1').toInteger()
+        versionName = (project.findProperty('versionName') ?: '0.0.0').toString()
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+        aaptOptions {
+             // Files and dirs to omit from the packaged assets dir, modified to accommodate modern web apps.
+             // Default: https://android.googlesource.com/platform/frameworks/base/+/282e181b58cf72b6ca770dc7ca5f91f135444502/tools/aapt/AaptAssets.cpp#61
+            ignoreAssetsPattern = '!.svn:!.git:!.ds_store:!*.scc:.*:!CVS:!thumbs.db:!picasa.ini:!*~'
+        }
+    }
+    signingConfigs {
+        release {
+            // Populated only when the workflow provided a keystore (see hasKeystore above); left empty
+            // otherwise so it is never referenced with a null storeFile.
+            if (hasKeystore) {
+                storeFile file(keystoreFile)
+                storePassword System.getenv('ANDROID_KEYSTORE_PASSWORD')
+                keyAlias System.getenv('ANDROID_KEY_ALIAS')
+                keyPassword System.getenv('ANDROID_KEY_PASSWORD')
+            }
+        }
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+            // Sign only when a keystore was supplied; a keyless release build stays unsigned instead
+            // of failing.
+            if (hasKeystore) {
+                signingConfig signingConfigs.release
+            }
+        }
+    }
+}
+
+repositories {
+    flatDir{
+        dirs '../capacitor-cordova-android-plugins/src/main/libs', 'libs'
+    }
+}
+
+dependencies {
+    implementation fileTree(include: ['*.jar'], dir: 'libs')
+    implementation "androidx.appcompat:appcompat:$androidxAppCompatVersion"
+    implementation "androidx.coordinatorlayout:coordinatorlayout:$androidxCoordinatorLayoutVersion"
+    implementation "androidx.core:core-splashscreen:$coreSplashScreenVersion"
+    implementation project(':capacitor-android')
+    testImplementation "junit:junit:$junitVersion"
+    androidTestImplementation "androidx.test.ext:junit:$androidxJunitVersion"
+    androidTestImplementation "androidx.test.espresso:espresso-core:$androidxEspressoCoreVersion"
+    implementation project(':capacitor-cordova-android-plugins')
+}
+
+apply from: 'capacitor.build.gradle'
+
+try {
+    def servicesJSON = file('google-services.json')
+    if (servicesJSON.text) {
+        apply plugin: 'com.google.gms.google-services'
+    }
+} catch(Exception e) {
+    logger.info("google-services.json not found, google-services plugin not applied. Push Notifications won't work")
+}

ui/android/app/capacitor.build.gradle

@@ -0,0 +1,20 @@
+// DO NOT EDIT THIS FILE! IT IS GENERATED EACH TIME "capacitor update" IS RUN
+
+android {
+  compileOptions {
+      sourceCompatibility JavaVersion.VERSION_21
+      targetCompatibility JavaVersion.VERSION_21
+  }
+}
+
+apply from: "../capacitor-cordova-android-plugins/cordova.variables.gradle"
+dependencies {
+    implementation project(':capacitor-app')
+    implementation project(':capacitor-network')
+
+}
+
+
+if (hasProperty('postBuildExtras')) {
+  postBuildExtras()
+}

ui/android/app/proguard-rules.pro

@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

ui/android/app/src/androidTest/java/com/getcapacitor/myapp/ExampleInstrumentedTest.java

@@ -0,0 +1,26 @@
+package com.getcapacitor.myapp;
+
+import static org.junit.Assert.*;
+
+import android.content.Context;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+import androidx.test.platform.app.InstrumentationRegistry;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+
+    @Test
+    public void useAppContext() throws Exception {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
+
+        assertEquals("com.getcapacitor.app", appContext.getPackageName());
+    }
+}

ui/android/app/src/main/AndroidManifest.xml

@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/AppTheme">
+
+        <activity
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|smallestScreenSize|screenLayout|uiMode|navigation|density"
+            android:name=".MainActivity"
+            android:label="@string/title_activity_main"
+            android:theme="@style/AppTheme.NoActionBarLaunch"
+            android:launchMode="singleTask"
+            android:exported="true">
+
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+
+        </activity>
+
+        <provider
+            android:name="androidx.core.content.FileProvider"
+            android:authorities="${applicationId}.fileprovider"
+            android:exported="false"
+            android:grantUriPermissions="true">
+            <meta-data
+                android:name="android.support.FILE_PROVIDER_PATHS"
+                android:resource="@xml/file_paths"></meta-data>
+        </provider>
+    </application>
+
+    <!-- Permissions -->
+
+    <uses-permission android:name="android.permission.INTERNET" />
+</manifest>

ui/android/app/src/main/java/ru/eruditgame/app/MainActivity.java

@@ -0,0 +1,5 @@
+package ru.eruditgame.app;
+
+import com.getcapacitor.BridgeActivity;
+
+public class MainActivity extends BridgeActivity {}