Adds 7 new test cases covering home/hospital navigation state:
- is_at_home() initial state and transitions
- go_to_home() with idempotence check
- go_to_hospital() state restoration and guards
- is_at_home flag cleanup on room navigation
Implements corresponding methods in RoomNavigator:
- is_at_home(): Returns home state
- go_to_home(): Navigates to home (0,0) and saves hospital position
- go_to_hospital(): Returns to previously saved hospital location
- _go_to_room_internal(): Helper to avoid flag interference
All 34 tests passing.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
