---
id: "e7d2b5a8-4c1f-4e9a-b6d3-8f2a1c4e6b09"
name: "Phase 5 Stabilization Closeout Check"
type: activity-definition
version: "1.0"
enabled: true
owner: custodian
governance: custodian
status: active
created: "2026-07-06"
trigger:
  type: scheduled
  at: "2026-07-09T17:35:00+00:00"
  timezone: UTC
context_sources:
  - type: state-hub
    query: phase5_stabilization_check
    required: true
    params:
      source: activity-core
      closeout: true
      window_start: "2026-07-06T17:35:00+00:00"
      window_end: "2026-07-09T17:35:00+00:00"
      baseline:
        workstreams: 640
        tasks: 4002
        topics: 14
      sweep_limit: 6
      triage_max_age_hours: 36
      evidence_sinks:
        - type: state-hub-progress
          event_type: phase5_stabilization_closeout
          author: activity-core
          workstream_id: 5ceff9dd-e034-46d9-a0e1-37f167ca0729
          task_id: 714a5095-8a5a-4d2f-9e7d-b2a2b1f21526
    bind_to: context.phase5_stabilization_check
---

# ActivityDefinition: Phase 5 Stabilization Closeout Check

## Purpose

One-shot closeout gate at the end of the `CUST-WP-0054-T05` stabilization
window. Fails visibly when hub-visible gates are not green. When gates pass,
records `operator_signoff_needed: true` for coulombcore teardown approval.

## Trigger

Scheduled once at **2026-07-09T17:35:00Z** (72h after window open).

## Output Contract

- one State Hub progress event with `event_type: phase5_stabilization_closeout`
- fails the ActivityRun when any gate is red at closeout time
- no LLM call and no direct workplan edits