Phase 1 verified:
- 8/8 requirements satisfied (DATA-01 through DATA-05, PERS-01 through PERS-03)
- 34 tests passing (22 unit + 12 integration)
- SortOrderProvider with 6 methods for sortOrder calculation
- Trip extension with day derivation methods
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
