[AZ-662] [AZ-669] Implement ego-motion estimator and primitive graph

AZ-662: movement_detector ego-motion
- Add opencv + petgraph to workspace dependencies
- internal/zoom_bands: per-band telemetry skew tolerances
- internal/telemetry_sync: skew gate (check_skew)
- internal/optical_flow: frame→gray, degenerate detection,
  LK sparse flow + RANSAC homography estimation
- internal/ego_motion: EgoMotionEstimator + atomic counters

AZ-669: semantic_analyzer primitive graph
- internal/primitive_graph: NodeType, PrimitiveNode, PrimitiveGraph,
  PrimitiveGraphBuilder with proximity-adjacency + BFS connectivity check
- internal/scoring/freshness: FreshnessScorer (Laplacian variance,
  texture stddev, undisturbed-surroundings heuristic)
- All ACs covered by unit tests (AC-1/2/3 per task)

Note: native OpenCV not installed on macOS; authoritative test is
cargo test --workspace on Jetson (ssh jetson-e2e).

Co-authored-by: Cursor <cursoragent@cursor.com>

crates/movement_detector/src/internal/mod.rs

@@ -0,0 +1,4 @@
+pub mod ego_motion;
+pub mod optical_flow;
+pub mod telemetry_sync;
+pub mod zoom_bands;