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Phases: - 8. DAG System TDD: Performance/edge case tests with 10k+ objects - 9. Trip Planner Modes TDD: By dates, must-see games, start/end cities - 10. Trip Builder Options TDD: Repeat cities, must-stops - 11. Itinerary & Constraints TDD: Travel directions, driving limits - 12. Integration Validation: End-to-end scenarios, regression suite Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>