Backend enhancements for real-time decision workflow:
**New Features**:
- decision_required event emission when game starts and after each decision
- Quick-create endpoint (/games/quick-create) for rapid testing with pre-configured lineups
- WebSocket connection manager integration in GameEngine
**Changes**:
- game_engine.py: Added _emit_decision_required() method and set_connection_manager()
- game_engine.py: Emit decision_required on game start with 5-minute timeout
- games.py: New /quick-create endpoint with Team 35 vs Team 38 lineups
- main.py: Wire connection manager to game_engine singleton
- state_manager.py: Enhanced state management for decision phases
- play_resolver.py: Improved play resolution logic
- handlers.py: Updated WebSocket handlers for new workflow
- backend/CLAUDE.md: Added WebSocket protocol spec reference
**Why**:
Eliminates polling - frontend now gets real-time notification when decisions are needed.
Quick-create saves 2 minutes of lineup setup during each test iteration.
**Testing**:
- Manual testing with terminal client
- WebSocket event flow verified with live frontend
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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