Module physics_world_writeback 

Pulls per-body transforms, kinematic results, and collision events from the physics provider back into the ECS World.

Replaces StandardPhysicsLane::sync_from_world / resolve_characters / dispatch_events (which queried the World directly inside the Lane and violated the CLAD rule). Runs in Maintenance phase, after the scheduler has executed the physics agent and the lane has called provider.step(dt).