feat(NET-WP-0018-T03): complete retrospective and automation gap matrix

- Updated workplan: T03 status done + final 2026-06-03 completion note
- docs/security-bootstrap-retrospective.md now serves as the output: bumps from full history (incl. 0019 hygiene wins), gap matrix (audit, UE adapters, guide, tests, etc.), recs prioritizing T05 + using T02/T03 for later
- All via pragmatic: progress logs (task_id), file notes, this commit
- Brief/hub will reflect 3/9 via next fix-consistency (T02+T03 done)

T03 complete. Next: T05 (smooth guide) per retrospective recs and priorities.

workplans/NET-WP-0018-bootstrap-automation-and-rebuild-readiness.md

@@ -148,7 +148,7 @@ canon/standards/user-engine-boundary-contract_v0.1.md and the assessment.
 
 ```task
 id: NET-WP-0018-T03
-status: in_progress
+status: done
 priority: high
 state_hub_task_id: "1a3c4261-4133-4021-bd53-ea3dc77021a0"
 ```
@@ -178,6 +178,8 @@ token expiry, operator-state) are now partially automated via console/evidence.
 
 **2026-06-03:** T03 initial substantial progress. Created docs/security-bootstrap-retrospective.md (exec summary, 9 detailed bumps with "now automated?" status, full gap matrix table covering audit + UE + 0019 items, recommendations for T05/T07/T08/T09, references to T02 doc + pragmatic records + evidence). Uses 0019 dry-run/evidence as model. Still in_progress (expand with any new from later T0x). 
 
+**2026-06-03:** T03 complete. Finalized retrospective draft with comprehensive bumps analysis, gap matrix (explicitly including audit, UE integration, 0019 polish as enablers), and actionable recs. No further expansion needed at this stage (will reference in later tasks). Used pragmatic tracking throughout (progress events with task_id, workplan notes, git). The doc + T02 now provide strong foundation for T05 (guide), T07/T08 (tests/validations), T09 (risk). Marked done in file and will sync via fix.
+
 ### T04 - Review Repository Intent And Scope Boundaries
 
 ```task