Add detailed Phase 4 (Game Service + WebSocket) project plan
18 tasks covering:
- WebSocket setup with python-socketio
- GameService lifecycle (create, join, execute, resume, end)
- Message protocol specification
- Connection management with Redis
- Turn timeout system
- Reconnection handling
- REST endpoints for game management
- Unit and integration tests
- Spectator mode (stretch goal)
Includes architecture decisions, sequence diagrams, and acceptance criteria.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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