Feat/orbit follow

[kvvasuu]

Adds OrbitFollow, a Body that orbits a target driven by three input axes: horizontal, vertical and radial.

• Sphere and threeRing orbit styles
• Damps the tracked target point
• Recentering behind the target
• rotationDampingBypass lets damped Aims (RotationComposer) follow the orbit's own turns
• debug prop draws the orbit
• lookRotation keeps HardLookAt / RotationComposer valid when looking along up
• lockToTargetOnAssign captures again on mode change and on activation
• autoNormalize prop and setFromPosition / setFromRotation to move the orbit from code
• Docs, golden scenarios, benches, and new example scenes (OrbitFollow group, focused input examples)

Breaking: Follow now runs on the shared tracker. With any bindingMode but worldSpace, turning with the target is instant unless the new rotationDamping is set. follow.prime no longer takes params. Golden fixtures that use Follow were re-recorded.

Closes #33