Add daily TODO.md stale review automation (CUST-WP-0056)

Schedule 08:30 Berlin daily scan for TODO.md unchanged 6+ days;
emit review tasks and promote durable work to workplans.

activity-definitions/daily-todo-md-stale-review.md

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+---
+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
+---
+
+# Daily TODO.md Stale Review
+
+Runs daily at 08:30 Europe/Berlin (after WSJF triage at 07:20). Scans
+registered workstation repos for `TODO.md` files that have not changed in
+6+ days and emits a review task per stale repo.
+
+Policy: TODO.md is a pragmatic interruption buffer only. Stale files should
+be reviewed — archive done items, delete noise, or promote durable work into
+a workplan via ADR-001.
+
+```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"]
+```

workplans/CUST-WP-0056-daily-todo-md-stale-review.md

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+---
+id: CUST-WP-0056
+type: workplan
+title: "Daily TODO.md Stale Review via activity-core"
+domain: custodian
+repo: the-custodian
+status: finished
+owner: codex
+topic_slug: custodian
+created: "2026-07-08"
+updated: "2026-07-08"
+---
+
+# CUST-WP-0056 — Daily TODO.md Stale Review via activity-core
+
+## Goal
+
+Automate daily review of workstation `TODO.md` files that have not changed in
+6+ days. TODO.md is a pragmatic interruption buffer; stale files should be
+reviewed and durable items promoted to workplans (ADR-001).
+
+## State Hub scan endpoint
+
+```task
+id: CUST-WP-0056-T01
+status: done
+priority: high
+```
+
+- `GET /repos/todo-md-staleness?stale_days=6` on State Hub
+- Scans active registered repos with accessible `local_path`
+- Returns repos whose `TODO.md` mtime is older than the threshold
+
+## activity-core resolver and schedule
+
+```task
+id: CUST-WP-0056-T02
+status: done
+priority: high
+```
+
+- Resolver query `todo_md_staleness` in activity-core `state_hub.py`
+- ActivityDefinition `daily-todo-md-stale-review.md` — cron `30 8 * * *` Berlin
+- Emits one review task per stale repo; progress event `todo_md_stale_review`
+
+## Retire STATUS.md pattern
+
+```task
+id: CUST-WP-0056-T03
+status: done
+priority: medium
+```
+
+- Confirmed no `STATE.md` files across workstation repos
+- Removed erroneous `STATUS.md` from net-kingdom; `SCOPE.md` remains canonical
+- README orientation points to SCOPE.md only