pr-precheck

Use when the user invokes /pr-precheck <repo> <topic> or — implicitly, before any other skill opens a pull request — to check the target repo's merged and closed PR history for prior attempts at the same fix, so the agent doesn't open the Nth duplicate of an already-rejected approach. Wraps the vouch pr-cache CLI (build / check / show) and turns its verdict into a clear stop / ask / proceed signal.