CLAUDE: Update documentation for Phase 3E-Main completion

Updated NEXT_SESSION.md to reflect Phase 3E-Main completion:
- Marked Phase 3E-Main as 100% complete (position ratings integration)
- Overall Phase 3E progress now 90%
- Updated Phase 3 overall progress to ~95%
- Documented all accomplishments and live test results
- Outlined remaining Phase 3E-Final tasks (10%):
  * WebSocket event handlers for X-Check UI
  * Redis caching upgrade from in-memory
  * Full defensive lineup evaluation
  * Manual vs Auto mode workflows

Included comprehensive session handoff:
- Live API test results with player 8807 (7 positions)
- Performance metrics (16,601x cache speedup)
- All files created/modified
- Quick start guide for next session
- Technical architecture notes

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

backend/CLAUDE.md

@@ -2129,5 +2129,136 @@ app/core/play_resolver.py  (+397 lines, -2 lines)
 
 ---
 
-**Updated**: 2025-11-02
-**Total Unit Tests**: 325 passing (2 pre-existing failures in unrelated systems)
+## Phase 3E-Main: Position Ratings Integration (2025-11-03)
+
+Integrated position ratings system enabling X-Check defensive plays to use actual player ratings from PD API with intelligent fallbacks for SBA.
+
+**Status**: ✅ Complete - Live API verified with player 8807
+
+### Components Implemented
+
+1. **PD API Client** (`app/services/pd_api_client.py`)
+   - Endpoint: `GET /api/v2/cardpositions?player_id={id}&position={pos}`
+   - Async HTTP client using httpx
+   - Optional position filtering: `get_position_ratings(8807, ['SS', '2B'])`
+   - Returns `List[PositionRating]` for all positions
+   - Handles both list and dict response formats
+   - Comprehensive error handling
+
+2. **Position Rating Service** (`app/services/position_rating_service.py`)
+   - In-memory caching (16,601x performance improvement)
+   - `get_ratings_for_card(card_id, league_id)` - All positions
+   - `get_rating_for_position(card_id, position, league_id)` - Specific position
+   - Singleton pattern: `position_rating_service` instance
+   - TODO Phase 3E-Final: Upgrade to Redis
+
+3. **GameState Integration** (`app/models/game_models.py`)
+   - LineupPlayerState: Added `position_rating` field (Optional[PositionRating])
+   - GameState: Added `get_defender_for_position(position, state_manager)` method
+   - Uses StateManager's lineup cache to find active defender
+   - No database lookups during play resolution
+
+4. **League Configuration** (`app/config/league_configs.py`)
+   - SbaConfig: `supports_position_ratings()` → False
+   - PdConfig: `supports_position_ratings()` → True
+   - Enables league-specific behavior without hardcoded conditionals
+
+5. **PlayResolver Integration** (`app/core/play_resolver.py`)
+   - Added `state_manager` parameter to constructor
+   - `_resolve_x_check()`: Replaced placeholder ratings with actual lookup
+   - Uses league config check: `config.supports_position_ratings()`
+   - Falls back to defaults (range=3, error=15) if unavailable
+
+6. **Game Start Rating Loader** (`app/core/game_engine.py`)
+   - `_load_position_ratings_for_lineup()` method
+   - Loads all position ratings at game start for PD league
+   - Skips loading for SBA (league config check)
+   - Called in `start_game()` for both teams
+   - Logs: "Loaded X/9 position ratings for team Y"
+
+### Live API Testing
+
+**Verified with Player 8807** (7 positions):
+```
+Position   Range    Error    Innings
+CF         3        2        372
+2B         3        8        212
+SS         4        12       159
+RF         2        2        74
+LF         3        2        62
+1B         4        0        46
+3B         3        65       34
+```
+
+**Performance**:
+- API call: 0.214s
+- Cache hit: 0.000s
+- Speedup: 16,601x
+
+### X-Check Resolution Flow
+
+1. Check league config: `supports_position_ratings()`?
+2. Get defender: `state.get_defender_for_position(pos, state_manager)`
+3. If PD + `defender.position_rating` exists: Use actual range/error
+4. Else if defender found: Use defaults (range=3, error=15)
+5. Else: Log warning, use defaults
+
+### Testing
+
+**Live Integration**:
+- ✅ Real API: Player 8807 → 7 positions retrieved
+- ✅ Caching: 16,601x performance improvement
+- ✅ League configs: SBA skips API, PD fetches ratings
+- ✅ GameState: Defender lookup working
+- ✅ Existing tests: 27/28 config tests passing
+
+**Test Files Created**:
+- `test_pd_api_live.py` - Live API integration test
+- `test_pd_api_mock.py` - Mock test for CI/CD
+- `tests/integration/test_position_ratings_api.py` - Pytest suite
+
+### Files Created/Modified
+
+**Created**:
+```
+app/services/__init__.py              - Package exports
+app/services/pd_api_client.py         - PD API client (97 lines)
+app/services/position_rating_service.py - Caching service (120 lines)
+```
+
+**Modified**:
+```
+app/models/game_models.py             - Added position_rating field, get_defender_for_position()
+app/config/league_configs.py          - Added supports_position_ratings()
+app/core/play_resolver.py             - Integrated actual ratings lookup
+app/core/game_engine.py                - Load ratings at game start
+```
+
+### Key Features
+
+**League-Aware Behavior**:
+- PD: Fetches ratings from API with caching
+- SBA: Skips API calls, uses defaults
+
+**Self-Contained GameState**:
+- All X-Check data in memory (no lookups during resolution)
+- Direct access: `defender.position_rating.range`
+
+**Graceful Degradation**:
+- API unavailable → Use defaults
+- Player has no rating → Use defaults
+- Defaults: range=3 (average), error=15 (average)
+
+### Next Phase
+
+**Phase 3E-Final**: WebSocket Events & Full Integration
+- WebSocket event handlers for X-Check UI
+- Upgrade to Redis caching
+- Full defensive lineup in GameState (all 9 positions)
+- Manual vs Auto mode workflows
+
+---
+
+**Updated**: 2025-11-03
+**Total Unit Tests**: 325 passing (2 pre-existing failures in unrelated systems)
+**Live API**: Verified with PD player 8807