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A single tile that only extended a word perpendicular to the client-declared direction was rejected: the UI always sent dir=H for one-tile plays (the dirOverride/Controls toggle was orphaned in the Stage 7 game rework), so placing "А" above "БАК" to form "АБАК" failed the solver's main-word-length check even though the word is in the dictionary. Make the backend infer a play's orientation from the placed tiles and the board (internal/engine.resolveDirection): two or more tiles by the line they share, a lone tile by the axis it abuts (longer word wins, horizontal on a tie). Direction becomes an output, not an input: drop dir from the SubmitPlay/Eval wire requests and add it to EvalResult. Journal replay keeps trusting the stored "H"/"V" (SubmitPlayDir) so a rebuilt game matches the one committed. UI: stop computing/sending direction; the preview now shows the words a move forms with its total score (game.previewWords); the make-move control is disabled until the play is confirmed legal; the "your turn" label hides while tiles are pending. Delete the orphaned Controls.svelte. Regenerate the FlatBuffers bindings (Go + TS) and update the gateway transcode and the loadtest edge client to the new contract. Bake the decision into ARCHITECTURE.md (§5/§9.1), FUNCTIONAL.md (+ _ru) and the backend README.
pkg
Shared wire contracts for the Scrabble platform (module scrabble/pkg),
imported by both backend and gateway. It carries no logic — only the
generated message types and the schemas they come from.
Layout
proto/push/v1/ # backend -> gateway live-event gRPC channel (Push.Subscribe)
# committed generated Go (*.pb.go, *_grpc.pb.go)
fbs/scrabble.fbs # FlatBuffers edge payloads (one `scrabblefb` namespace)
fbs/scrabblefb/ # committed generated Go for the schema
proto/push/v1is the single gRPC server-stream the backend exposes and the gateway subscribes to (Event{user_id, kind, payload, event_id}); thepayloadis an opaque FlatBuffers body the gateway forwards verbatim.proto/telegram/v1is the Telegram connector's RPC contract (includingValidateLoginWidgetfor the web Login Widget sign-in).fbsholds the client↔gateway request/response and event payloads as FlatBuffers tables. The backend encodes the push payloads from these types; the gateway transcodes the rest to and from the backend's JSON; the UI generates TypeScript from the same.fbs.
Generated code
Committed (CI only builds it); regenerate dev-time after editing the schemas:
make -C pkg tools # go install protoc-gen-go + protoc-gen-go-grpc
make -C pkg gen # buf generate (proto) + flatc (fbs)
flatc is pinned to 23.5.26 to match the github.com/google/flatbuffers
Go runtime in go.mod; generating with another version is refused.
Workspace wiring
scrabble/pkg is a bare-path module (no dot), so — like scrabble-solver — it
cannot be fetched as a versioned dependency. go.work carries use ./pkg and
replace scrabble/pkg v0.0.0 => ./pkg; consumers require scrabble/pkg v0.0.0.