feat: add post-game coach

[avatarneil]

Summary

The AI game-over moment now gives the learner a compact coaching takeaway when the completed match has a meaningful missed decision. The coach identifies the strongest turning point, shows the chosen move versus the recommended move, and lets the learner inspect or retry that exact one-move position without disturbing the finished game.

This keeps the first version focused on the highest-attention learning moment: one practical lesson at game over, with graceful fallback to the existing simple result when analysis cannot produce a useful coach brief.

Design Notes

• Post-game analysis replays the completed move history from a fresh initial state so normal turn flow and saved game semantics stay unchanged.
• History entries can now preserve optional coach metadata, including the pre-move state needed to reopen the review locally.
• Retry mode is intentionally a one-move exercise in the play view; it reveals the coach move after the learner chooses and then returns cleanly to the completed board.

Verification

• npm run lint passes with existing warnings in unrelated AI/remotion files.
• npx tsc --noEmit passes when a temporary local declaration shim is used for the missing generated wasm/pkg/knucklebones_ai module.
• npm run build is blocked locally because Homebrew Rust is missing the wasm32-unknown-unknown target needed by wasm-pack.

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Project	Deployment	Actions	Updated (UTC)
knucklebones	Ready	Preview, Comment	May 18, 2026 1:37am