## Summary
- Adds a new daily GitHub Actions workflow (`draft-stale-prs.yml`) that
automatically converts open PRs to draft state when there has been no
activity for 7 days
- Checks four activity signals: last commit push, issue comments, review
comments, and reopen events
- Leaves a comment explaining why the PR was converted to draft

## Test plan
- [ ] Trigger the workflow manually via `workflow_dispatch` and verify
it runs without errors
- [ ] Verify it skips PRs that are already in draft state
- [ ] Verify it correctly identifies stale PRs with no activity in 7
days

🤖 Generated with [Claude Code](https://claude.com/claude-code)
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<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> CI/workflow-only change that affects PR state and adds comments; main
risk is unintended drafting due to activity detection edge cases or
API/rate-limit behavior.
> 
> **Overview**
> Adds a new scheduled/manual GitHub Actions workflow
(`draft-stale-prs.yml`) that scans open PRs and converts *non-draft* PRs
to draft when there has been no activity for 7+ days.
> 
> The workflow computes “last activity” from the latest commit, non-bot
issue comments, review comments, review submissions, and
`reopened`/`ready_for_review` timeline events, then posts an explanatory
comment after converting; it also caps processing to 30 PRs and aborts
on rate-limit/permission errors.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
c9fc2ae9527e48f4ab4452ce0f2ecb2c0eb5f2fa. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

---------
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>