## Summary
- Adds a new GitHub Action (`close-stale-prs.yml`) that runs daily at
midnight UTC
- Automatically closes open PRs that were created more than 2 months ago
- Leaves a friendly comment before closing each stale PR

## Test plan
- Verify the workflow YAML is valid by checking the Actions tab after
merge
- Can be manually triggered via `workflow_dispatch` to test behavior

#skip-bugbot

🤖 Generated with [Claude Code](https://claude.com/claude-code)
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<!-- This is an auto-generated description by cubic. -->
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## Summary by cubic
Adds a scheduled GitHub Action to automatically close open PRs older
than 2 months and post a comment, keeping the backlog tidy. Runs daily
at midnight UTC.

- **New Features**
- Adds .github/workflows/close-stale-prs.yml using
actions/github-script@v7
  - Requires pull-requests: write permission
  - Supports manual runs via workflow_dispatch
  - Logs closed PRs to workflow output

<sup>Written for commit 6687ed758e6104e8cde06895a021b121283aea71.
Summary will update on new commits.</sup>

<!-- End of auto-generated description by cubic. -->

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Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>