[AZ-662] [AZ-669] Archive batch 19; defer test gate

Batch 19 (movement_detector ego-motion + semantic_analyzer primitive
graph) is committed at db844db. This archival commit:

- Writes _docs/03_implementation/batch_19_cycle1_report.md with a
  lightweight inline code review (PASS_WITH_WARNINGS; 5 low/medium
  findings — see F1-F5 in the report).
- Transitions AZ-662 and AZ-669 In Progress -> In Testing in Jira
  (transition id 32 -> status id 10036) per implement/SKILL.md Step 12.
- Logs _docs/_process_leftovers/2026-05-20_batch19_opencv_test_gate.md
  explaining why `cargo test --workspace` could not be run this session
  (macOS dev box has no native OpenCV; brew install failed with ENOSPC;
  Jetson host is the CI infra box, not a dev sandbox). Replay options
  documented in the leftover.
- Updates _docs/_autodev_state.md sub_step to between-batches-blocked:
  batch 20 selection MUST NOT auto-chain until the test gate is closed.

Cargo.lock picks up the `bytes` dev-dep entries for movement_detector
and semantic_analyzer (mechanical lockfile sync; no version bumps).

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

Cargo.lock

@@ -1577,6 +1577,7 @@ dependencies = [
 name = "movement_detector"
 version = "0.1.0"
 dependencies = [
+ "bytes",
  "opencv",
  "shared",
  "tokio",
@@ -2351,6 +2352,7 @@ dependencies = [
 name = "semantic_analyzer"
 version = "0.1.0"
 dependencies = [
+ "bytes",
  "opencv",
  "petgraph",
  "shared",