Implement comprehensive test infrastructure and all 124 tests across 11 phases:
- Phase 0: Test infrastructure (fixtures, mocks, helpers)
- Phases 1-10: Core planning engine tests (previously implemented)
- Phase 11: Edge case omnibus (11 new tests)
- Data edge cases: nil stadiums, malformed dates, invalid coordinates
- Boundary conditions: driving limits, radius boundaries
- Time zone cases: cross-timezone games, DST transitions
Reorganize test structure under Planning/ directory with proper organization.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
