Multi-repo reviews: choose branch or PR per linked repo

Multi-repo analysis branch selection

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For multi-repo analysis, you can now control which ref of a linked repository CodeRabbit reviews against. Reference a branch or pull request of an already-linked repository in your pull request description — for example owner/repo#123, a PR/branch URL, or owner/repo@branch-name — and CodeRabbit reviews against that ref instead of the linked repository's default branch. References to repositories that aren't linked are ignored.

CodeRabbit also matches a linked repository's branch automatically when its name matches your pull request's head branch, so coordinated changes pushed to identically named branches are picked up without any description.

The selected branch or pull request now appears in the Review info section of the review summary, so reviewers can see exactly which ref each linked repository was reviewed against.

See Specifying a branch or pull request to review against for details.