[Fix] Review labels disappear after base updates

[zoomote]

​Created by Roomote. Follow up by mentioning @roomote, in the web UI, or in Discord.

What changed

• Preserve the current PR review-state label while GitHub reports mergeability as unknown.
• Keep the review gate pending and update the review guide until mergeability is known.
• Cover the transient state with a regression test that verifies the maintainer label remains, the completed CodeRabbit activation label is removed, and the pending guidance is published.

Why this change was made

The all-open-PR reconciliation triggered by the merge of #1577 ran while GitHub was recalculating mergeability. Although CodeRabbit approvals remained attached to the exact PR head commits, the unknown-mergeability branch removed otherwise-valid awaiting-maintainer labels, making the queue appear to collapse.

Impact

Base-branch pushes no longer temporarily erase review-state labels while GitHub recalculates mergeability. Confirmed conflicts still transition to has-conflicts, and the hourly/event-driven reconciliation still replaces preserved labels once GitHub returns a definitive state.

Follow-up to #1577 and #1509.

[coderabbitai]

Important

Review skipped

Auto reviews are limited based on label configuration.

🏷️ Required labels (at least one) (1)

• coderabbit-review-active

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Advanced

Run ID: 1da1759f-de2e-49cd-82fd-52c67bdeb8d4

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

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[github-actions]

Review status

This PR was opened by an automated account. A human maintainer must verify the change intent, provenance, and validation before merging.

Current step: Mark the PR ready. Required CI must pass before CodeRabbit starts.

Review-state labels are managed by this workflow; do not edit them manually.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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