Bite-sized TDD plan for the swept-sphere camera collision: CollideCamera flag,
ICameraCollisionProbe + PhysicsCameraCollisionProbe (reuses ResolveWithTransition),
RetailChaseCamera slot-in, GameWindow wiring, Camera-menu toggle, visual
acceptance. Also refines the spec from planning findings: the InitPath +radius
sphere-center offset (ToSpherePath/FromSpherePath z-shift) and the deterministic
probe test scope (z-offset round-trip + cellId==0 guard; collision correctness
rides the existing sweep suite + visual).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>