Add Core Hub production stabilization scheduled checks

Introduce the core-hub context resolver stabilization_check query, State Hub
progress summaries, activity-definition projections, and unit tests for the
CORE-WP-0007 post-cutover window.

k8s/railiance/20-runtime.yaml

@@ -284,6 +284,79 @@ data:
     ---
 
     # ActivityDefinition: Phase 5 Stabilization Closeout Check
+  core-hub-stabilization-daily.md: |
+    ---
+    id: "b4c8e2f1-6a3d-4e5b-9f0c-2d7e8a1b3c4d"
+    name: "Core Hub Stabilization Daily Check"
+    type: activity-definition
+    version: "1.0"
+    enabled: true
+    owner: core-hub
+    governance: core-hub
+    status: active
+    created: "2026-07-07"
+    trigger:
+      type: cron
+      cron_expression: "0 9 * * *"
+      timezone: Europe/Berlin
+      misfire_policy: skip
+    context_sources:
+      - type: core-hub
+        query: stabilization_check
+        required: true
+        params:
+          source: activity-core
+          closeout: false
+          base_url: "https://hub.coulomb.social"
+          window_start: "2026-07-03T00:00:00+00:00"
+          window_end: "2026-07-10T17:35:00+00:00"
+          min_widget_types: 26
+          evidence_sinks:
+            - type: state-hub-progress
+              event_type: core_hub_stabilization_check
+              author: activity-core
+              workstream_id: a8d66822-e435-4b1e-ad81-37a298d1795e
+              task_id: 16eb7ce3-b574-4667-a189-c14ff5d0502b
+        bind_to: context.core_hub_stabilization_check
+    ---
+
+    # ActivityDefinition: Core Hub Stabilization Daily Check
+  core-hub-stabilization-closeout.md: |
+    ---
+    id: "c5d9f3a2-7b4e-5f6c-0a1d-3e8f9b2c4d5e"
+    name: "Core Hub Stabilization Closeout Check"
+    type: activity-definition
+    version: "1.0"
+    enabled: true
+    owner: core-hub
+    governance: core-hub
+    status: active
+    created: "2026-07-07"
+    trigger:
+      type: scheduled
+      at: "2026-07-10T17:35:00+00:00"
+      timezone: UTC
+    context_sources:
+      - type: core-hub
+        query: stabilization_check
+        required: true
+        params:
+          source: activity-core
+          closeout: true
+          base_url: "https://hub.coulomb.social"
+          window_start: "2026-07-03T00:00:00+00:00"
+          window_end: "2026-07-10T17:35:00+00:00"
+          min_widget_types: 26
+          evidence_sinks:
+            - type: state-hub-progress
+              event_type: core_hub_stabilization_closeout
+              author: activity-core
+              workstream_id: a8d66822-e435-4b1e-ad81-37a298d1795e
+              task_id: 16eb7ce3-b574-4667-a189-c14ff5d0502b
+        bind_to: context.core_hub_stabilization_check
+    ---
+
+    # ActivityDefinition: Core Hub Stabilization Closeout Check
   ops-service-inventory-probes.md: |
     ---
     id: "40d15a87-7ff6-4d8e-992c-37df15f95110"