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>