Class PhysicsFeature

Handles simple entity gravity + block collision physics.

Current behavior:

• Only simulates non-player entities
• Only simulates entities that have BOTH gravity and collision traits
• Uses bottom-center entity positioning
• Resolves motion one axis at a time (Y, then X, then Z)
• Uses full solid block collision based on permutation.type.solid
• Applies entity friction plus block ground friction when grounded
• Applies air drag while airborne for a more vanilla-like feel

Notes:

• This is tick-based physics, not time-in-seconds physics
• Velocity values are assumed to already be tuned for per-tick updates
• entity.isMoving is based on actual displacement this tick so the movement system can still broadcast the final landing correction