[aw] PR Documentation Check hit engine rate limit (HTTP 429)

### Workflow Failure

**Workflow:** [PR Documentation Check](https://github.com/microsoft/aspire/blob/main/.github/workflows/pr-docs-check.md)
**Branch:** fix-radius-backing-resources
**Run:** https://github.com/microsoft/aspire/actions/runs/34907869578

> [!WARNING]
> **Engine Rate Limited (HTTP 429)**: The `copilot` engine hit provider rate limits and could not complete this run.

This signal was detected from engine runtime logs/OTLP telemetry.

**What to do next**
- Retry the workflow after a short delay.
- If this keeps happening, reduce concurrent workflow volume or review provider quota/rate-limit policies.

### 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/microsoft/aspire/actions/runs/34907869578
````

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 pr-docs-check failure in https://github.com/microsoft/aspire/actions/runs/34907869578`

> [!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 [PR Documentation Check](https://github.com/microsoft/aspire/actions/runs/34907869578) · 132.2 AIC · [◷](https://github.com/search?q=repo%3Amicrosoft%2Faspire+is%3Aissue+%22gh-aw-workflow-id%3A+pr-docs-check%22&type=issues)
> - [x] expires on Sep 21, 2026, 11:26 PM UTC

Start with .github/workflows/pr-docs-check.md and the failed run 34907869578. Inspect the workflow logs and its concurrency and provider-rate-limit behavior; done means the PR Documentation Check no longer fails from the reported Copilot HTTP 429, or the failure is handled according to the workflow's intended policy.

Written by the indexing model from the issue text.