ci: trigger CodeRabbit review on PR un-draft

[alexeyv]

Summary

• Adds a GitHub Actions workflow that automatically triggers CodeRabbit review when a draft PR is marked as ready for review
• Works around a known CodeRabbit limitation where the ready_for_review webhook event is not reliably handled

Context

CodeRabbit auto-review triggers on PR creation (opened event) but often misses the ready_for_review event fired when a draft PR is un-drafted. This workflow listens for that event and posts @coderabbitai review as a comment, ensuring the review happens automatically.

Test plan

• Create a draft PR, then mark it as ready for review
• Verify the workflow runs and posts the @coderabbitai review comment
• Verify CodeRabbit then performs the review automatically

[coderabbitai]

📝 Walkthrough

Walkthrough

A GitHub Actions workflow is added that automatically posts a comment requesting CodeRabbit review when pull requests are marked as ready for review. The workflow uses the GitHub API to interact with pull request comments.

Changes

Cohort / File(s)	Summary
GitHub Actions Workflow .github/workflows/coderabbit-review.yaml	Adds new workflow that automatically posts a "@coderabbitai review" comment on PRs ready for review using actions/github-script to call GitHub API.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• chore: disable CodeRabbit review status comments #1069 — Modifies CodeRabbit's review automation behavior in relation to automatic review-status comments.

Suggested reviewers

• bmadcode
• pbean

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'ci: trigger CodeRabbit review on PR un-draft' accurately summarizes the main change: adding a GitHub Actions workflow that triggers CodeRabbit review when a draft PR is marked as ready for review.
Description check	✅ Passed	The description clearly explains the workflow's purpose, the specific problem it addresses (CodeRabbit missing ready_for_review events), and includes a concrete test plan.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch ci/coderabbit-ready-review

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