Add 10 TDD tests for GameDAGRouter covering:
- Empty games array returns empty routes
- Single game returns single-game route
- Single game with non-matching anchor returns empty
- Two chronological feasible games returns combined route
- Two games too far apart same day returns separate routes
- Two games reverse chronological returns separate routes
- Three games with only feasible pairs returns valid combinations
- Anchor filtering excludes routes missing anchors
- Repeat cities OFF excludes same city twice
- Repeat cities ON allows same city twice
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
a4db9a92eb