[codex] Add annotation camera angle helpers

[meekmachine]

Summary

• Add shared annotation camera-angle/laterality helpers to Loom3.
• Export semantic side detection, laterality detection, camera-angle resolution, world/model direction conversion, orbit angle calculation, and marker camera-angle gating.
• Add focused coverage for side-aware angles, nested visibility angle inference, model-local orbit angles, and marker gate behavior.

Why

LoomLarge had been carrying this low-level Three.js camera-angle logic locally in annotationLaterality.ts. Moving it into Loom3 lets app code consume shared semantic camera/annotation behavior instead of duplicating model-local angle math in the runtime.

Validation

• npm test -- src/camera/annotationCameraAngles.test.ts
• npm run typecheck