[self-care:open-source-failures] Fix recurring live-mode target authority failures in gh-aw-cao maintenance workflows

githubnext/gh-aw-cao has at least 15 bounded-snapshot failures across `dependabot-release-train-updater`, `aw-maintenance-compiler-security`, `aw-maintenance-upgrade`, and `aw-failures-investigator`, all blocked before agent work by the same live-mode pre-activation error: target authority is missing on the target default branch. This is a recurring control-plane configuration defect with high confidence, and the newest bounded evidence shows it is still blocking runs.

**Action:** CAO maintainers should fix the live-mode target authority for the affected package targets or downgrade those targets to review mode; accept when a rerun of one affected workflow completes pre-activation without `Target authority missing: add .github/workflows/cao.json to the target default branch for live mode`.

Agent prompt
Investigate the recurring live-mode pre-activation failures in `githubnext/gh-aw-cao` caused by `Target authority missing: add .github/workflows/cao.json to the target default branch for live mode`. Review the package rollout policy and target-authority records for `dependabot-release-train-updater`, `aw-maintenance-compiler-security`, `aw-maintenance-upgrade`, and `aw-failures-investigator`. Make the smallest safe change so each affected target either has valid live-mode authority on its protected default branch or is explicitly limited to review mode. Keep fail-closed behavior. Regenerate any required workflow artifacts from source rather than editing lock files directly, and include a short note describing which targets were corrected.

Critical findings:
- Severity: P1
- Normalized signature: `Target authority missing: add .github/workflows/cao.json to the target default branch for live mode`
- Affected repository: `githubnext/gh-aw-cao`
- Affected workflows: `dependabot-release-train-updater`, `aw-maintenance-compiler-security`, `aw-maintenance-upgrade`, `aw-failures-investigator`
- Representative run: https://github.com/githubnext/gh-aw-cao/actions/runs/33963096379
- Additional corroborating runs: https://github.com/githubnext/gh-aw-cao/actions/runs/33961619481, https://github.com/githubnext/gh-aw-cao/actions/runs/33961628215, https://github.com/githubnext/gh-aw-cao/actions/runs/33961636624
- Evidence-supported cause: live-mode execution is blocked because the target repository lacks the required target-authority declaration on the default branch.
- Confidence: high

Bounded evidence

Observed run counts in the snapshot:
- `.github/workflows/dependabot-release-train-updater.lock.yml`: 5 enriched failures with the same signature
- `.github/workflows/aw-maintenance-compiler-security.lock.yml`: 5 enriched failures with the same signature
- `.github/workflows/aw-maintenance-upgrade.lock.yml`: 3 enriched failures with the same signature
- `.github/workflows/aw-failures-investigator.lock.yml`: 2 enriched failures with the same signature

The evidence window is the fixed seven-day snapshot ending at 2026-09-05T11:59:05.013Z. The snapshot is truncated to the newest 100 failed runs, so additional blocked runs may exist outside the bounded sample.

### Control Plane
- Correlation ID: `33965965540-220`
- Central repository: `githubnext/gh-aw-cao`
- Control plane run URL: `https://github.com/githubnext/gh-aw-cao/actions/runs/33965965540`

> Generated by [SelfCare / Open Source Failures](https://github.com/githubnext/gh-aw-cao/actions/runs/33966125093) · pi · gpt54 · 24.7 AIC · ⌖ 8.8 AIC · ⊞ 8.3K · [◷](https://github.com/search?q=repo%3Agithubnext%2Fgh-aw-cao+is%3Aissue+%22gh-aw-workflow-call-id%3A+githubnext%2Fgh-aw-cao%2Fself-care-open-source-failures%22&type=issues)
> - [x] expires on Sep 19, 2026, 12:33 PM UTC

Start with the four affected workflow artifacts: .github/workflows/dependabot-release-train-updater.lock.yml, aw-maintenance-compiler-security.lock.yml, aw-maintenance-upgrade.lock.yml, and aw-failures-investigator.lock.yml. Review the package rollout policy and target-authority records for the named targets, keeping fail-closed behavior and regenerating artifacts from source when required. Done means one affected workflow reruns past pre-activation without the target-authority error, with a note identifying the corrected or review-mode targets.

Written by the indexing model from the issue text.