ci: don't block PRs when CodeRabbit is rate limited

[QuantumExplorer]

Issue being fixed or feature implemented

When CodeRabbit is rate limited it posts a failing CodeRabbit commit status ("Review rate limited"), which turns the PR checks rollup red (e.g. #4171) even when thepastaclaw has already reviewed the PR. The desired policy is: either a CodeRabbit or a thepastaclaw review must happen — a rate-limited CodeRabbit should not block a PR on its own.

What was done?

• Added .coderabbit.yaml with reviews.fail_commit_status: false so CodeRabbit no longer fails its commit status when a review can't be performed (this checked-in config overrides the org/UI setting where the failing status is currently enabled).
• Added an AI Review workflow check (.github/workflows/pr-ai-review.yml) that passes once either coderabbitai or thepastaclaw has submitted a review on the PR. It re-runs automatically on pull_request_review events, so it flips green as soon as the first review lands. Because either reviewer satisfies it, a rate-limited CodeRabbit never blocks a PR that thepastaclaw reviewed (and vice versa).

Note: the CodeRabbit status was never a required check in branch protection — the failing status was cosmetic but made PRs look blocked. If we want the new gate to be enforced, the context AI Review / CodeRabbit or PastaClaw review can be added to the required status checks on the dev branches after this merges.

How Has This Been Tested?

• Validated both YAML files parse.
• Verified reviews.fail_commit_status exists (default false) in the CodeRabbit v2 config schema.
• Confirmed via the GitHub API that the failing CodeRabbit status on feat(platform)!: document history system contract with per-doctype opt-in #4171 is not a required check, and that this workflow's review query matches the reviews present there (thepastaclaw has reviewed → gate would pass).

Breaking Changes

None.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have added "!" to the title and described breaking changes in the corresponding section if my code contains any
• I have made corresponding changes to the documentation if needed

For repository code-owners and collaborators only

• I have assigned this pull request to a milestone

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features

  • Added an automated pull request review check that passes when an approved automated or designated reviewer submits a review.
  • The check reruns automatically when pull requests are updated or new reviews are submitted.

• Chores

  • Updated review status handling so temporary review failures, such as rate limiting, do not incorrectly fail the commit status.

[coderabbitai]

Warning

Ignoring CodeRabbit configuration file changes. For security, only the configuration from the base branch is applied for open source repositories.

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 1925720e-ef0e-4575-abbb-218c80f0053f

📥 Commits

Reviewing files that changed from the base of the PR and between e8ea6ea and f2b13e8.

📒 Files selected for processing (2)

• .coderabbit.yaml
• .github/workflows/pr-ai-review.yml

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📝 Walkthrough

Walkthrough

Changes

AI review enforcement

Layer / File(s)	Summary
Workflow entrypoint .github/workflows/pr-ai-review.yml	Adds the “AI Review” workflow for pull request activity and review submissions, with read-only permissions and per-PR concurrency.
Review identity gate .github/workflows/pr-ai-review.yml, .coderabbit.yaml	Checks paginated, non-pending reviews for approved identities and disables CodeRabbit commit-status failure when review execution is unavailable.

Estimated code review effort: 2 (Simple) | ~15 minutes

Sequence Diagram(s)

sequenceDiagram
  participant PullRequest
  participant AIReviewWorkflow
  participant GitHubReviews
  PullRequest->>AIReviewWorkflow: Trigger on PR activity or review submission
  AIReviewWorkflow->>GitHubReviews: Paginate pull request reviews
  GitHubReviews-->>AIReviewWorkflow: Return non-pending reviews
  AIReviewWorkflow-->>PullRequest: Pass or fail the AI Review check

Loading

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title matches the main goal of preventing PR checks from blocking when CodeRabbit cannot review due to rate limiting.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/coderabbit-rate-limit-block-a46f1b

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[thepastaclaw]

🕓 Ready for review — 19 ahead in queue (commit f2b13e8)
Queue position: 20/20