CLAUDE: Phase 3 - Substitution System Core Logic
Implemented comprehensive substitution system with DB-first pattern:
## Core Components (1,027 lines)
1. SubstitutionRules (345 lines)
- Validates pinch hitter, defensive replacement, pitching change
- Enforces no re-entry, roster eligibility, active status
- Comprehensive error messages with error codes
2. SubstitutionManager (552 lines)
- Orchestrates DB-first pattern: validate → DB → state
- Handles pinch_hit, defensive_replace, change_pitcher
- Automatic state sync and lineup cache updates
3. Database Operations (+115 lines)
- create_substitution(): Creates sub with full metadata
- get_eligible_substitutes(): Lists inactive players
4. Model Enhancements (+15 lines)
- Added get_player_by_card_id() to TeamLineupState
## Key Features
- ✅ DB-first pattern (database is source of truth)
- ✅ Immutable lineup history (audit trail)
- ✅ Comprehensive validation (8+ rule checks)
- ✅ State + DB sync guaranteed
- ✅ Error handling at every step
- ✅ Detailed logging for debugging
## Architecture Decisions
- Position flexibility (MVP - no eligibility check)
- Batting order inheritance (pinch hitter takes spot)
- No re-entry (matches real baseball rules)
- Validation uses in-memory state (fast)
## Remaining Work
- WebSocket event handlers (2-3 hours)
- Comprehensive testing (2-3 hours)
- API documentation (1 hour)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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