[aw] CI Outer-Loop Failure Scanner failed

### Workflow Failure

**Workflow:** [CI Outer-Loop Failure Scanner](https://github.com/dotnet/runtime/blob/main/.github/workflows/ci-failure-scan.md)
**Branch:** main
**Run:** https://github.com/dotnet/runtime/actions/runs/31854706476

> [!WARNING]
> **Engine Failure**: The `copilot` engine terminated before producing output.

The engine exited immediately without producing any output. This often indicates a transient infrastructure issue (e.g., service unavailable, API rate limiting). If this failure recurs, check the GitHub Copilot status page and review the firewall audit logs.

### Action Required

**Assign this issue to an agent** to debug and fix the issue.

Debug with any coding agent

Use this prompt with any coding agent (GitHub Copilot, Claude, Gemini, etc.):

````
Debug the agentic workflow failure using https://raw.githubusercontent.com/github/gh-aw/main/debug.md

The failed workflow run is at https://github.com/dotnet/runtime/actions/runs/31854706476
````

Manually invoke the agent

Debug this workflow failure using your favorite Agent CLI and the `agentic-workflows` prompt.

- Start your agent
- Load the `agentic-workflows` skill from `.github/skills/agentic-workflows/SKILL.md` or
- Type `debug the agentic workflow ci-failure-scan failure in https://github.com/dotnet/runtime/actions/runs/31854706476`

> [!TIP]
>
> Stop reporting this workflow as a failure
>
> To stop a workflow from creating failure issues, set `report-failure-as-issue: false` in its frontmatter:
> ```yaml
> safe-outputs:
> report-failure-as-issue: false
> ```
>
>

> Generated from [CI Outer-Loop Failure Scanner](https://github.com/dotnet/runtime/actions/runs/31854706476) · [◷](https://github.com/search?q=repo%3Adotnet%2Fruntime+is%3Aissue+%22gh-aw-workflow-id%3A+ci-failure-scan%22&type=issues)
> - [x] expires on Aug 22, 2026, 12:51 AM UTC

Start by reviewing .github/workflows/ci-failure-scan.md and the linked workflow run, then consult the agentic-workflows skill at .github/skills/agentic-workflows/SKILL.md. Done means identifying why the copilot engine terminated without output and confirming that the CI Outer-Loop Failure Scanner completes successfully.

Written by the indexing model from the issue text.