Rebase a work-in-progress or completed branch onto a new base, ensuring the rebased changes still satisfy their original spec, comply with the (possibly updated) architecture, conventions, and invariants of the new base, and introduce no regressions. Use when the user says "rebase this branch on X", "rebase my work on master", "move these commits onto the new base", or otherwise asks to migrate a set of commits onto a different base than they were authored against.