Domino:
- dealAndSyncToServer: retry once on failure, abort to room on 2nd fail (#100)
- syncPassToServer: only increment moveCount after success (#41)
- drawFromBoneyard: debounce with drawInFlight flag (#42)
- endMatch: guard empty players array, fallback to match IDs (#209)

Backgammon:
- createGame: fallback to sheshbesh if variant key missing (#26)
- handleServerState: selective merge instead of Object.assign (#56)

Core:
- multiplayer.js: mark startDisconnectWatch as deprecated (#229)
- core.css: replace hardcoded HUD values with token variables
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>