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Added 7 TDD tests for Feature 2 (geographic efficiency / anti-backtracking): - Route must start at specified start city - Route must end at specified end city - Intermediate games in wrong order rejected or reordered - Multiple route options - least backtracking preferred - Minor backtracking within tolerance is acceptable - Excessive backtracking beyond destination rejected - Correct directional classification for north-to-south route All tests pass - existing ScenarioCPlanner implementation already validates monotonic progress and prevents excessive backtracking. Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>