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Phase 9 complete: All three trip planner modes validated with TDD. Summary of 09-03 accomplishments: - Feature 1: Corridor game inclusion (5 tests, 1 fix) - Enhanced findDirectionalStadiums() to exclude beyond-endpoint games - Feature 2: Anti-backtracking validation (7 tests, all passed) - Confirmed existing implementation validates monotonic progress 12 tests added, 3 commits (2 test, 1 feat). State updates: - Progress: 30% → 40% - Phase 9: Complete (3/3 plans) - Next: Phase 10 (Trip Builder Options TDD) Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>