Adds the per-frame Update(playerPos, yaw, velocity, dt) entrypoint
that composes the math primitives into a renderable View matrix +
PlayerTranslucency. State: 5-frame velocity ring, damped eye + forward
unit vector, first-frame snap flag, mouse-filter shared state.
Public surface: Distance/Pitch/YawOffset/PivotHeight tunables,
AdjustDistance/Pitch (with clamps), FilterMouseDelta entry, View +
Position + PlayerTranslucency outputs. 5 new integration tests, all
pass; total RetailChaseCamera test count 25.
Also folds in two minor cleanups from the Task 2 code review:
- AverageVelocity uses ring.Length instead of hardcoded 5
- Basis_NearVerticalHeading test asserts orthogonality of right & up
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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