Drive a PR to merge: address review comments (human + Copilot), push fixes, wait for CI to go green, then squash-merge. Use when a human says "babysit PR #NNN", "address the comments and merge when green", or "get this PR landed". Pushes and merges — invoking it IS the authorization to do so. Refuses to merge on red CI, unresolved blocking reviews, or conflicts; escalates instead.