Hourly PR Maintenance Loop

Schedules the fix-all skill to run every hour via Claude Code's native /loop primitive (CronCreate/ScheduleWakeup) — not GitHub Actions, no new external service, no secrets beyond the local git/gh session already in use. All the actual check/fix logic (sync, CI, CodeRabbit threads, lint, coverage, code-hygiene — the security model and audible notifications that govern it) lives in fix-all; this skill only owns the scheduling.

Known limitations (surface these, don't hide them)