Backend changes:
- Add PendingXCheck model for interactive x-check state
- Extend decision_phase/pending_decision validators with 4 new phases
- Add initiate_x_check() to roll dice and present chart to player
- Add submit_x_check_result() to process player selection
- Add resolve_x_check_from_selection() to resolve from player input
- Add WebSocket handlers for x-check workflow
- Modify resolve_manual_play() to route X_CHECK to interactive flow
- All 986 unit tests passing
Frontend changes:
- Extend DecisionPhase type with x-check/DECIDE phases
- Add XCheckData, DecideAdvanceData, DecideThrowData, DecideSpeedCheckData interfaces
- Add PendingXCheck to GameState
- Add 4 new client→server WebSocket events
Next: Implement XCheckWizard component and GameplayPanel integration
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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