Add 7 canTransition boundary tests:
- Same stadium same day 4 hours apart is feasible
- Different stadium 1000 miles apart same day is infeasible
- Different stadium 380 miles apart 2 days apart is feasible
- Different stadium 100 miles apart 4 hours available is feasible
- Different stadium 100 miles apart 1 hour available is infeasible
- Game end buffer (3 hour) validation
- Arrival buffer (1 hour) validation
Also removes broken DayCardTests that referenced types removed in
previous refactor (DayCard, DayConflictInfo).
Total: 17 GameDAGRouter edge case tests all passing.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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