blind_chess/.claude/handoffs/2026-05-18-205736-table-fidelity-features.md

Handoff: Table-fidelity feature batch — code-complete, pending deploy

Session Metadata

• Created: 2026-05-18 20:57:36
• Project: /home/claude/bin/blind_chess
• Branch: main (all work committed and pushed to git.sethpc.xyz/Seth/blind_chess)
• Session duration: ~one full session (brainstorm → spec → plan → 12-task execution)

Handoff Chain

• Continues from: 2026-04-29-060121-blind-casual-check-fix.md — the prior session fixed blind Casual's premature resignation.
• Supersedes: None.

Recent Commits (for context)

• 2e80800 docs: record table-fidelity feature batch as code-complete
• 59717b3 docs: amend plan to reflect code-review fixes
• 82a69d8 fix(client): key phantom-load effect on gameId, gate the drag ghost
• 313837e feat(client): wire the phantom opponent-model layer into the game view
• 816f89b feat(client): phantom-piece palette component
• Full implementation range: be8ecd9..2e80800 (20 commits).

Current State Summary

The "table-fidelity feature batch" (three features Andrew Freiberg — Seth's dad, a physical-blind-chess player — requested by email) is fully implemented, reviewed, and committed to main, but not yet deployed. All 12 plan tasks were executed via subagent-driven development with two-stage review per task plus a final whole-batch review. Build, typecheck, and the 87-test suite all pass. The remaining steps are a manual browser pass and deployment to the two live instances.

Architecture Overview

Three features, two increments, all shipped:

1. Announce-all (F1): every moderator Announcement is now audience: 'both'. Previously move events went only to the opponent and attempted-move errors only to the actor. The audience field is retained (uniformly 'both') as the egress-control hook in ws.ts/ModeratorPanel. The Casual bot's intermediate retry-rejection announcements are popped in BotDriver.dispatch so its blind-mode search does not broadcast as churn — only its final move is announced.
2. Capture tally (F2): a server-derived per-viewer captures: CaptureTally field on the joined/update messages, rendered by a new CaptureTally.svelte panel. Must be server-side — in blind mode the capturing client cannot see what it took.
3. Phantom layer (F3): a client-LOCAL overlay of guessed opponent pieces, blind mode only. Seeded once with the opponent's standard army, then fully manual: pointer-drag a phantom anywhere, off-board to remove, re-add from an unlimited palette. Persisted to localStorage (bc:phantoms:<gameId>). Never sent to the server — it lives in its own store so the zero-leak property is auditable.

The zero-leak core (buildView, geometric.ts) was deliberately untouched.

Critical Files

File	Purpose	Relevance
docs/superpowers/specs/2026-05-18-table-fidelity-features-design.md	The spec	Design rationale, info-leak analysis
docs/superpowers/plans/2026-05-18-table-fidelity-features.md	The 12-task plan	Amended to match shipped code
packages/server/src/translator.ts, commit.ts	F1 audience change	All announcements 'both'
packages/server/src/bot/driver.ts	F1 bot-churn suppression	dispatch pops intermediate rejections
packages/server/src/captures.ts	F2 captureTally	Pure per-viewer derivation
packages/shared/src/phantoms.ts	F3 pure model	opponentStartPosition, deserializePhantoms (tested)
packages/client/src/lib/stores/phantoms.svelte.ts	F3 local store	Never read in any send path
packages/client/src/lib/stores/phantom-drag.svelte.ts	F3 drag controller	Pointer events, tap-vs-drag, pointercancel-safe
packages/client/src/lib/Board.svelte, Game.svelte, PhantomPalette.svelte	F3 UI	Phantom rendering + wiring

Key Patterns Discovered

• Build ordering: server/client resolve @blind-chess/shared from its built dist/. After editing shared, run pnpm --filter @blind-chess/shared build before downstream typecheck/build. pnpm -r build handles order automatically.
• Client has no test harness (by design). Pure logic worth testing goes to packages/shared (vitest); Svelte components are covered by svelte-check + manual.
• ply-parity actor derivation: the four attempted-move enums carry no colour; the client derives White/Black from ply % 2 (an attempt only happens on the actor's turn).

Work Completed

• Tasks 1–11 of the plan (all three features), each with implementer + spec-compliance review + code-quality review and fix loops.
• Final whole-batch code review — verdict: ready to ship, no Critical/Important issues.
• Checkpoint A and B verifications: pnpm -r build && pnpm -r typecheck && pnpm -r test all clean; 87 tests pass (25 shared + 62 server).
• DECISIONS.md, CLAUDE.md, and the spec updated to reflect the shipped state.

Files Modified

See git diff --stat be8ecd9..2e80800. New files: packages/server/src/captures.ts, packages/server/test/unit/captures.test.ts, packages/shared/src/phantoms.ts, packages/shared/test/phantoms.test.ts, packages/client/src/lib/{CaptureTally,PhantomPalette}.svelte, packages/client/src/lib/stores/{phantoms,phantom-drag}.svelte.ts. Modified: translator.ts, commit.ts, bot/driver.ts, ws.ts, shared/{types,protocol,index}.ts, client/lib/{Board,Game,ModeratorPanel}.svelte, client/lib/stores/game.svelte.ts.

Decisions Made

All recorded in DECISIONS.md under "Table-fidelity features (2026-05-18)" and "Deferred / Rejected". Key ones: announcements widened to 'both' (deliberate, authorised); manual phantom model (smart-tracker rejected); phantom layer client-local only; drag-and-drop for phantoms only (real moves stay click-to-move).

Immediate Next Steps

1. Manual browser verification of the client UI (see Blockers — not done this session). Run pnpm dev:server + pnpm dev:client, create a blind game vs computer, and check: the moderator panel shows White/Black-labelled attempt lines; the Captures panel updates on a capture; the phantom layer renders 16 seeded pieces; dragging a phantom moves it / off-board removes it; the palette places phantoms; a tap still makes real moves; phantoms persist across reload; vanilla mode shows no phantom UI; phantoms hide on game end.
2. Deploy both instances per CLAUDE.md → Operations: CT 690 (chess.sethpc.xyz) and chess.local on VDJ-RIG. Server restart drops in-memory games.
3. After deploy, smoke-test on a phone (the phantom drag is the main mobile-risk surface).

Blockers / Open Questions

• Client UI not manually verified in a browser. The implementation passed build, svelte-check, the 87-test automated suite, and multi-stage code review — but an AI agent cannot run an interactive browser. The phantom drag-and-drop interaction in particular (pointer events, tap-vs-drag threshold, hit-testing) is verified only by review, not by clicking. Recommend Seth (or a browser-capable session) does the manual pass before/after deploy.

Deferred Items

• Phantom-layer localStorage cleanup for games abandoned mid-play (no finished transition) — tiny leak, add a stale-key sweep only if it matters.
• Highlighting interacting with phantoms (rays stopping at phantom pieces) — safe but out of v1 scope.
• An ai-game-casual WebSocket integration test for F1 — the driver.test.ts unit test was chosen instead (covers the same commit-path; spec updated to record this).

Important Context

• Everything is on main and pushed. Seth explicitly chose to work directly on main (no feature branch). There is nothing to merge.
• The work is code-complete but undeployed. chess.sethpc.xyz is still running the pre-batch code until someone deploys. Deployment is an outward-facing action — confirm with Seth before doing it.
• Two deploy instances now exist (CLAUDE.md was updated mid-project): CT 690 / chess.sethpc.xyz, and chess.local on VDJ-RIG. Both need the update.
• The final review confirmed the security invariant holds: no phantom token anywhere under packages/server/src/, buildView/geometric.ts byte-for-byte unchanged.

Assumptions Made

• The client a11y trade-off (phantom spans and palette pieces are pointer-only, with a documented svelte-ignore a11y_no_static_element_interactions) is acceptable — adding tabindex without a keyboard drag would be worse a11y. Real gameplay stays fully keyboard-operable via the square buttons.
• 87 is the expected test count (25 shared + 62 server); the client contributes 0 (no harness).

Potential Gotchas

• packages/server/tsconfig.tsbuildinfo shows persistent M in git status — pre-existing drift (tracked before *.tsbuildinfo was gitignored), not this session's work.
• The pre-commit hook is detect-secrets-hook --baseline .secrets.baseline.
• Server restart on deploy drops all in-memory games.

Environment State

• Tools/Services: pnpm workspace; gitea CLI for push. Subagent-driven development for execution.
• Active Processes: none. No dev servers left running.
• Environment Variables: none added or changed.

Related Resources

• Spec: docs/superpowers/specs/2026-05-18-table-fidelity-features-design.md
• Plan: docs/superpowers/plans/2026-05-18-table-fidelity-features.md
• DECISIONS.md → "Table-fidelity features (2026-05-18)"
• Live URL: https://chess.sethpc.xyz · Repo: https://git.sethpc.xyz/Seth/blind_chess (main at 2e80800)

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Security Reminder: No credentials or secrets are included in this handoff.