PR Babysitter

IS: autonomous monitoring of an open PR (conflicts, CI across GitHub Actions/Buildkite/Vercel/Fly.io, review comments, merge readiness) with auto-fixes, plus one-shot CI diagnosis or conflict resolution.
IS NOT: creating the PR (use pr-creator), reviewing the diff for bugs (use pr-reviewer), or npm release pipelines (use autoship, which watches its own release CI; never babysit a release or Version Packages PR that autoship is driving).

Mode Selection

Invocation	Mode
"babysit", "watch this PR", "monitor", "keep it green"	Monitor: Phase 1 once, then phases 2-5 on every cron tick
"fix CI", "why is CI red", "CI is broken", "loop on CI"	One-shot Phase 3 loop, no cron
"resolve conflicts", "fix conflicts"	One-shot Phase 2, no cron
"triage review comments", "address the comments"	One-shot Comment Triage Workflow, no cron

Rules for every mode: