[AZ-512] chore: reactivate for cycle 4 (Option B path)

User authorized Option B from the original AZ-512 Cross-Workspace
Verification gate: implement UI form with MSW-stubbed tests in
parallel with AZ-513 shipping on admin/. Task spec moved from
backlog/ → todo/. STATUS line updated. Leftover record re-opened
until AZ-513 deploys live.

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

_docs/_autodev_state.md

@@ -2,9 +2,9 @@
 
 ## Current Step
 flow: existing-code
-step: 9
-name: New Task
-status: not_started
+step: 10
+name: Implement
+status: in_progress
 sub_step:
   phase: 0
   name: awaiting-invocation
@@ -14,7 +14,7 @@ cycle: 4
 tracker: jira
 
 ## Notes
-- Cycle 3 closed 2026-05-13: AZ-510 + AZ-511 shipped (6/9 pts, B3 + F3 closed); AZ-512 deferred to backlog at cross-workspace gate (AZ-513 filed on admin/).
-- Retro: `_docs/06_metrics/retro_2026-05-13_cycle3.md`. Structural snapshot: `_docs/06_metrics/structure_2026-05-13.md`.
-- 7 user-action items in backlog (carry from cycles 2-3): see `_docs/_process_leftovers/`.
-- Pre-Step-9 (cycle 4) sweep: cycle-3 unstaged docs + `ripple_log_cycle3.md` + `security_report_cycle3_delta.md` (untracked) NOT in any commit yet — flag to user before starting cycle 4.
+- Cycle 3 closed 2026-05-13 (commit eef3bdf): 6/9 pts shipped, AZ-512 → backlog (AZ-513 prereq on admin/).
+- Cycle 4 entry: user reactivated AZ-512 (Option B path, MSW-stubbed). Step 9 (New Task) skipped — task spec already exists in `_docs/02_tasks/todo/AZ-512_admin_edit_detection_class.md`.
+- Cross-workspace dependency: AZ-513 on admin/ NOT shipped at cycle entry. Step 11 (Run Tests) will pass on MSW stubs; Step 16 (Deploy) gates on AZ-513 landing live.
+- Leftovers: `2026-05-12_az-498-deploy-and-key-revocations.md` (manual), `2026-05-13_az-512-admin-classes-prereq.md` (re-opened until AZ-513 deploys live).