chore: WIP pre-implement

Bundled hygiene commit before cycle-3 /implement (AZ-776, AZ-777). Mixes
two concerns by user choice (autodev option B):

- Cycle-3 autodev artifacts not yet committed by Step 9 (new-task):
  task specs for AZ-776 / AZ-777 under _docs/02_tasks/todo/ and the
  updated _docs/02_tasks/_dependencies_table.md.
- Accumulated skill / rule tooling maintenance under .cursor/ (skills:
  autodev, code-review, decompose, deploy, implement, new-task, plan,
  refactor, retrospective, test-spec; rules: coderule, cursor-meta,
  meta-rule, testing; new release skill scaffolding).
- Autodev bootstrap state: _docs/_autodev_state.md (step 10 in_progress)
  and _docs/_process_leftovers/2026-05-11_d_cross_cve_1_opencv_pin_deferred.md
  (replay timestamp refreshed; gtsam 4.2 still numpy<2-only).

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

_docs/_autodev_state.md

@@ -2,14 +2,14 @@
 
 ## Current Step
 flow: existing-code
-step: 12
-name: Test-Spec Sync
-status: not_started
+step: 10
+name: Implement
+status: in_progress
 sub_step:
   phase: 0
   name: awaiting-invocation
-  detail: ""
+  detail: "cycle 3 implement: AZ-776 first (no deps), then AZ-777 (depends on AZ-776)"
 retry_count: 0
-cycle: 2
+cycle: 3
 tracker: jira
 last_completed_batch: 102