[AZ-487] [AZ-488] retro: cycle 2 report + structural snapshot

Cycle-2 retrospective covering AZ-487 + AZ-488. Captures six patterns
(duplicate JWT helpers diverged then both broke; pre-existing
test bugs unmasked by downstream test pressure; cycle 1 perf-NFR
action stopped adding scenarios but did not drain backlog; doc-path
F1 carried over twice with no decision; integration test DB
isolation = wallclock workaround; 8 SP friction observable even
with user override). Top-3 improvement actions: consolidate JWT
mint helpers, promote PT-07/PT-08/JWT-attach to real PBI, real
integration DB-reset hook.

LESSONS.md ring buffer now holds 6 entries (testing x3, process x2,
estimation x1).

Structural snapshot: 6 components / 12 PR edges unchanged; contract
coverage 14% -> 29%; new external NuGet edges (JwtBearer 8.0.21 +
ImageSharp 3.1.11) tied to cycle-2 security findings.

Autodev pointer advances to cycle 3 / 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: 17
-name: Retrospective
-status: in_progress
+step: 9
+name: New Task
+status: not_started
 sub_step:
   phase: 0
   name: awaiting-invocation
   detail: ""
 retry_count: 0
-cycle: 2
+cycle: 3
 tracker: jira
 auto_push: true