Personal Vehicles
Personal vehicles are persistent physical objects in the world.
An enclosed vehicle may contain one or more real interior Rooms. Those
interiors are off the city map themselves, but their physical position follows
the exterior vehicle's actual world location.
Basic entry and exit
When a vehicle has one configured exterior-access compartment:
enter <vehicle>
get in <vehicle>
get into <vehicle>
moves you physically inside it.
`enter` resolves only objects that actually belong to an enterable physical
subsystem, so unrelated objects do not steal vehicle shorthand such as
`enter car`.
From an exterior-access compartment:
get out
out
leave vehicle
exit vehicle
returns you to the Room currently containing the exterior vehicle.
Internal-only compartments do not become magic exits merely because they are
inside the same vehicle.
Doors, locks, ownership, seats, control stations, ignition and driving are
separate vehicle systems and do not come from the boarding command itself.