Implements time-based behavior transitions for NPCs:
- GameTime converts real time to game time (1 real min = 1 game hour)
- ScheduleEntry defines hour/state/location/data transitions
- NpcSchedule manages multiple entries with midnight wrapping
- process_schedules() applies transitions when game hour changes
- TOML support for schedule data in mob templates
- Integrated into game loop with hourly checks
Tests cover schedule transitions, game time calculation, TOML loading, and preventing duplicate processing.
