Project Daily TODO.md stale review to railiance production ConfigMap

Adds daily-todo-md-stale-review.md to actcore-external-activity-definitions
for 08:30 Berlin cron via todo_md_staleness State Hub query.

k8s/railiance/20-runtime.yaml

@@ -203,6 +203,55 @@ data:
 
     Kubernetes projection of the Custodian-owned definition in
     `/home/worsch/the-custodian/activity-definitions/state-hub-consistency-sweep.md`.
+  daily-todo-md-stale-review.md: |
+    ---
+    id: "b8e4f1a2-3c6d-4e9f-a1b2-7d8e9f0a1b2c"
+    name: "Daily TODO.md Stale Review"
+    type: activity-definition
+    version: "1.0"
+    enabled: true
+    owner: custodian
+    governance: custodian
+    status: active
+    created: "2026-07-08"
+    trigger:
+      type: cron
+      cron_expression: "30 8 * * *"
+      timezone: Europe/Berlin
+      misfire_policy: skip
+    context_sources:
+      - type: state-hub
+        query: todo_md_staleness
+        required: true
+        params:
+          stale_days: 6
+        bind_to: context.todo_staleness
+    report_sinks:
+      - type: state-hub-progress
+        event_type: todo_md_stale_review
+        author: activity-core
+    ---
+
+    # ActivityDefinition: Daily TODO.md Stale Review
+
+    Kubernetes projection of the Custodian-owned definition in
+    `/home/worsch/the-custodian/activity-definitions/daily-todo-md-stale-review.md`.
+
+    ```rule
+    id: flag-stale-todo-md
+    for_each: context.todo_staleness.repos
+    bind_as: repo
+    condition: 'context.repo.age_days >= 6'
+    action:
+      task_template: 'Review stale TODO.md — {context.repo.repo_slug}'
+      description: >-
+        TODO.md unchanged for {context.repo.age_days} days (mtime {context.repo.mtime}).
+        Review open items: archive done work, delete noise, or promote valuable
+        topics to a workplan file and run statehub fix-consistency.
+      target_repo: context.repo.repo_slug
+      priority: low
+      labels: ["todo-md", "stale-review", "automated"]
+    ```
   phase5-stabilization-daily.md: |
     ---
     id: "f3a8c2e1-9b4d-4a6f-8e2d-1c5b7a9e3f04"