Cameras brick: node-target orbit, follow smoothing and tests #297

Current State

The cameras brick (org.mass4.turian.cameras) ships Follow, Orbit, FreeFly and FPS rigs. Follow keeps a fixed offset with no smoothing. Orbit targets a Vector3 rather than a node, so it cannot follow a moving object. The brick has no tests.

Tasks

• Orbit: accept a node target and follow it
• Follow: positional and rotational smoothing with configurable damping
• Tests for each rig (offsets, smoothing convergence, target loss)
• Document the rigs and their settings

Acceptance Criteria

• An orbit camera tracks a moving node without user code.
• Follow smoothing is deterministic for a fixed time step and covered by tests.

Related

#171 (virtual cameras: look-at, dead zone, collision avoidance and blending build on this brick)