docs: prepare core-hub archive closeout

activity-definitions/core-hub-stabilization-daily.md

@@ -3,11 +3,12 @@ id: "b4c8e2f1-6a3d-4e5b-9f0c-2d7e8a1b3c4d"
 name: "Core Hub Stabilization Daily Check"
 type: activity-definition
 version: "1.0"
-enabled: true
+enabled: false
 owner: core-hub
 governance: core-hub
-status: active
+status: archived
 created: "2026-07-07"
+updated: "2026-08-21"
 trigger:
   type: cron
   cron_expression: "0 9 * * *"
@@ -35,6 +36,10 @@ context_sources:
 
 # ActivityDefinition: Core Hub Stabilization Daily Check
 
+> Historical definition for the completed July 2026 Core Hub/Inter-Hub
+> stabilization window. It is disabled and must not be reused for the August
+> hub-core cutover window.
+
 ## Purpose
 
 Scheduled hub-visible health gate for `CORE-WP-0007-T02` during the post-cutover
@@ -52,4 +57,4 @@ outside the window are recorded as `skipped` with
 
 - one State Hub progress event with `event_type: core_hub_stabilization_check`
 - compact pass/fail detail for public production surface checks
-- no LLM call and no direct workplan edits
+- no LLM call and no direct workplan edits