docs: prepare core-hub archive closeout

workplans/CORE-WP-0010-runtime-absorption-and-archive.md

@@ -143,7 +143,7 @@ Evidence is recorded in
 
 ```task
 id: CORE-WP-0010-T05
-status: wait
+status: progress
 priority: medium
 state_hub_task_id: "16525001-f85e-4dae-9dc4-d36cb1eb4fbe"
 ```
@@ -157,6 +157,14 @@ started at 2026-08-21T20:49:50+02:00 and ends no earlier than
 repository read-only on Forgejo, and hand any remaining product-intent gaps to
 live records outside this repository.
 
+Archive preparation started 2026-08-21. `docs/deployment/archive-closeout.md`
+now freezes feature development here, records live residual owners, preserves
+non-destructive retention boundaries, and defines the ordered final checklist.
+`docs/deployment/stabilization-signoff.md` and
+`make stabilization-check` define the current fail-closed production gate.
+Only elapsed stabilization, final observations, operator approval, rollback
+scale-down, and the read-only Forgejo action remain.
+
 ## Acceptance
 
 - [x] Absorption inventory complete