NONE_MOVE_PROFILE: MovementProfile = ...

The single canonical no-movement profile for MOVEMENT_MEDIUM.NONE — a disabled profile with zero speeds representing an actor that cannot move at all (e.g. a Structure).

Actors never author a NONE entry in their SohlActorData.movementProfiles; this shared constant stands in for it, so every non-mover need not define its own. It also doubles as the fallback when an actor's currentMoveMedium names no configured profile (movement in a medium the actor lacks).