[self-care:open-source-failures] github/gh-aw windows-grower startup failure blocks execution

`github/gh-aw` has a blocking startup failure in `windows-grower.lock.yml`; the workflow never reached a reported job or step in the bounded snapshot, so execution is likely failing before normal task logic begins.

**Action:** The `github/gh-aw` maintainer should inspect the workflow's runner/startup configuration and rerun `windows-grower.lock.yml`; accept when a fresh run for the same workflow starts successfully and completes without a `startup_failure` conclusion.

Critical findings:
- Severity: `P0` because the run concluded with `startup_failure`.
- Repository: `github/gh-aw`.
- Workflow: `.github/workflows/windows-grower.lock.yml`.
- Representative run: https://github.com/github/gh-aw/actions/runs/33957657319
- Run count in bounded snapshot: 1.
- Evidence-supported cause: startup or infrastructure failure before actionable job-level evidence was emitted.
- Confidence: medium.

Agent prompt
Investigate why `.github/workflows/windows-grower.lock.yml` in `github/gh-aw` is ending with `startup_failure` before job-level evidence appears. Check the workflow definition, runner labels/image availability, required startup prerequisites, and any recent changes affecting job bootstrapping. Make the smallest safe fix that restores startup, then verify with a rerun. Report the exact root cause and the validation result.

Why this issue was filed
This cluster is the highest-severity untracked finding in the newest-100-run public snapshot. Because the failure occurs before normal workflow execution, it can block all useful work for that workflow until startup is restored.

### Control Plane
- Correlation ID: `33960667980-215`
- Central repository: `githubnext/gh-aw-cao`
- Control-plane run: https://github.com/githubnext/gh-aw-cao/actions/runs/33960667980

> Generated by [SelfCare / Open Source Failures](https://github.com/githubnext/gh-aw-cao/actions/runs/33960822561) · pi · gpt54 · 23.1 AIC · ⌖ 8.62 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, 10:35 AM UTC

Start with .github/workflows/windows-grower.lock.yml in github/gh-aw and inspect its runner, startup prerequisites, and recent workflow changes. Use representative run 33957657319 as the failure reference, then rerun the same workflow after the smallest safe correction. Done means a fresh run starts and completes without a startup_failure conclusion, with the root cause and validation result recorded.

Written by the indexing model from the issue text.