[self-care:open-source-failures] Fix missing live-mode target authority for Dependabot / Release Trains

`Dependabot / Release Trains` is repeatedly failing in `githubnext/gh-aw-cao` during control precompute because live-mode target authority is reported missing. The bounded snapshot shows 5 recurring failures with the exact message `Target authority missing: add .github/workflows/cao.json to the target default branch for live mode`, which is a high-confidence P1 configuration defect rather than a transient runtime error.

**Action:** The workflow maintainer should verify whether this workflow is intended to run live against its current target set and then either add the required target authority on the target default branch or downgrade the rollout to review mode; accept when a fresh run passes control precompute without the target-authority error.

Agent prompt
Inspect the rollout policy and target-authority requirements for `Dependabot / Release Trains` in `githubnext/gh-aw-cao`. If live mode is intended, add or repair the required `.github/workflows/cao.json` target-authority declaration on the target default branch through the approved path; otherwise change policy so the workflow no longer requests live mode without authority. Keep the fix minimal and summarize the chosen path and verification evidence.

Critical findings:
- Repository: `githubnext/gh-aw-cao`
- Workflow: `.github/workflows/dependabot-release-train-updater.lock.yml`
- Normalized signature: `Target authority missing: add .github/workflows/cao.json to the target default branch for live mode`
- Severity: P1
- Run count in bounded snapshot: 5
- Confidence: high
- Evidence-supported cause: missing live-mode target authority for at least one target in the configured rollout

Representative runs

- https://github.com/githubnext/gh-aw-cao/actions/runs/34035911897
- https://github.com/githubnext/gh-aw-cao/actions/runs/34035907004
- https://github.com/githubnext/gh-aw-cao/actions/runs/34035901983
- https://github.com/githubnext/gh-aw-cao/actions/runs/34035896739
- https://github.com/githubnext/gh-aw-cao/actions/runs/34035891298

Bounded fix options

1. If live changes are intended, add the missing target-authority declaration where CAO expects it.
2. If authority is not intended yet, fail closed by switching the affected rollout to `review` until authority exists.

### Control Plane
- Correlation ID: `34038609967-288`
- Central repository: `githubnext/gh-aw-cao`
- Control-plane run: https://github.com/githubnext/gh-aw-cao/actions/runs/34038609967

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> - [x] expires on Sep 20, 2026, 2:24 PM UTC

Start with .github/workflows/dependabot-release-train-updater.lock.yml and review the rollout policy and target-authority requirements for Dependabot / Release Trains. Determine whether live mode is intended, then verify the chosen authority or review-mode configuration with a fresh run; done means control precompute passes without the target-authority error.

Written by the indexing model from the issue text.