[AZ-484] Cycle 1 Step 17 Retrospective: report + structural snapshot

Closes the AZ-484 cycle:
- retro_2026-05-11.md: 5 patterns identified (code-review-PASS does
  not imply runtime PASS; spec-authorship under-specifies wire
  format / test sites; NFR test-spec entries decoupled from runner
  scripts; pre-existing module doc staleness; pre-existing security
  Mediums now visible). Top-3 actions ranked by impact, with target
  rule/skill files and owners.
- structure_2026-05-11.md: baseline structural snapshot for future
  retro deltas (6 components, 12 ProjectReference edges, 0 cycles
  in import graph, 0 net architecture violations, 1 frozen
  contract, ~14% contract coverage).
- LESSONS.md: header rewritten to describe the two-layer format
  (deep lessons + 15-entry ring buffer); appended 3 new ring-buffer
  entries (testing/process/estimation) sourced from this retro.
- _autodev_state.md: cycle 2 starting at Step 9 New Task.

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

_docs/_autodev_state.md

@@ -2,14 +2,14 @@
 
 ## Current Step
 flow: existing-code
-step: 16
-name: Deploy
-status: in_progress
+step: 9
+name: New Task
+status: not_started
 sub_step:
-  phase: 1
-  name: cycle-deploy-report
+  phase: 0
+  name: awaiting-invocation
   detail: ""
 retry_count: 0
-cycle: 1
+cycle: 2
 tracker: jira
 auto_push: true