GH PR Fix Once

Goal

Do one full cleanup pass on an open GitHub pull request:

1. catch the PR branch up to its base branch (origin/master unless the PR targets another base)
2. inspect failing or pending checks and unresolved review threads
3. address all currently known actionable issues
4. run applicable tests, lint, and build
5. re-check the base branch and merge it again if it advanced, then commit and push the fixes
6. resolve only the threads actually addressed

Stop after that one pass. Do not sleep, poll, or keep looping for newly appearing issues.

When to use

Use this skill when the user asks to: