Integration (M8 + M9): annotation→3D, camera paths, README, v0.1.0
M8: POST /api/annotations resolves a bbox to a 3D point (ray → two-view
triangulation / nearest-point / centroid-depth) via lane B's geometry
primitives; correction panel + bbox-drawing UI; resolved anchors render live
in overlays and the 3D scene. CR-2 (additive): annotations.event_id +
PATCH /api/events/{id} + db.update_event.
M9: keyframed god's-eye camera paths (Catmull-Rom position + slerp
orientation, export/import), gizmos, path-mode camera hooks.
Verified: 101 backend tests pass (two-view corner recovery err 0.00000);
frontend build clean; live in-browser M8 triangulation (gap 0.21) + M9 path
(camera on keyframe at t) + M4 sync ~16ms. Cleanup: worktrees removed, debris
stash dropped, pristine demo DB.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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