## Summary
- Adds a new GitHub Actions workflow (`merge-pr.yml`) that automatically
merges PRs when CI passes
- Only merges PRs authored by allowed users (wwwillchen, wwwillchen-bot)
- Requires the "merge-when-ready" label to be present on the PR
- Uses squash merge for a clean commit history

## Test plan
- Verify the workflow file syntax is valid
- Create a test PR with the "merge-when-ready" label and verify it
auto-merges after CI passes
- Verify PRs without the label or from non-allowed authors are not
auto-merged

🤖 Generated with [Claude Code](https://claude.com/claude-code)
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<!-- This is an auto-generated description by cubic. -->
---
## Summary by cubic
Adds a GitHub Actions workflow that auto-merges PRs via squash after CI
succeeds, gated by the "merge-when-ready" label and an allowed author
list. Improves reliability with targeted PR lookup, pagination for
checks, and explicit guards to avoid ambiguous or incomplete states.

- **New Features**
- Adds .github/workflows/merge-pr.yml triggered on CI workflow_run
completion for pull_request events.
- Finds the PR via workflow_run.pull_requests; refuses merge if multiple
PRs are linked; fallback uses commit lookup with head_branch match and
refuses merge if multiple open PRs; confirms the PR is open.
- Validates all check suites with pagination; skips
neutral/skipped/cancelled, the workflow’s own suite, and
workflow_run-triggered suites; requires at least one successful suite;
uses sha in merge to prevent race conditions; parses allowed authors
from env robustly.

<sup>Written for commit a007deffa6b3c8807833dcee702fa99179f9fe7e.
Summary will update on new commits.</sup>

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

---------
Co-authored-by: Will Chen <willchen90@gmail.com>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>