Add comprehensive unit and integration tests for Week 5 deliverables:
- test_play_resolver.py: 18 tests covering outcome resolution and runner advancement
- test_validators.py: 36 tests covering game state, decisions, lineups, and flow
- test_game_engine.py: 7 test classes for complete game flow integration
Update implementation documentation to reflect completed status:
- 00-index.md: Mark Phase 2 Weeks 4-5 complete with test coverage
- 02-week5-game-logic.md: Comprehensive test details and completion status
- 02-game-engine.md: Forward-looking snapshot pattern documentation
Week 5 now fully complete with 54 unit tests + 7 integration test classes passing.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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