When parallel pull requests target the same integration branch, merging one moves the base of…

When parallel pull requests target the same integration branch, merging one moves the base of every remaining PR; a green or “cleanly mergeable” badge does not preserve review and test evidence that was pinned to the old base. Where delivery policy requires evidence for an exact base-to-head diff, update the remaining branch from the new base, rerun the complete relevant verification, and have independent reviewers inspect the new exact revision before treating it as merge-ready. This applies to base-sensitive review workflows; it may be unnecessary only when the recorded evidence is explicitly tree-only and the changed base cannot affect the evaluated behavior.