- Port backgammonjs-master rules to ES modules (standard, gul bara, tapa variants)
- 3-tier bot AI (easy/medium/hard) with positional evaluation
- Doubling cube with Crawford rule for match play
- Canvas board renderer with piece stacking, hit/bear-off animations
- Room scene with variant/length/difficulty selection
- Full multiplayer via backgammon-match.php (queue, move, heartbeat, leave)
- Realtime subscription for backgammon_matches table
- Emote panel + phrase system (reuses Ludo pattern)
- 7 new SFX slots in branding admin (dice, move, hit, bear, double, win)
- Match system (first-to-N, gammon/backgammon scoring multipliers)
- Wired into engine.js, play table, queue routing, match-session recovery
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>