- Enforce invite codes on registration (INVITE_ONLY=true by default)
- Bootstrap admin account for first-time setup
- Require authentication for WebSocket connections and room creation
- Add Glicko-2 rating system with multiplayer pairwise comparisons
- Add Redis-backed matchmaking queue with expanding rating window
- Auto-start matched games with standard rules after countdown
- Add "Find Game" button and matchmaking UI to client
- Add rating column to leaderboard
- Scale down docker-compose.prod.yml for 512MB droplet
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
