Agent Skills: github-fix-failed-workflow

Diagnose and fix failed GitHub Actions workflow runs, and write or edit workflow files following clear, minimal conventions. Use when workflows fail, CI/CD issues occur, debugging GitHub Actions runs, or when creating or editing .github/workflows/*.yml files. Triggers on "fix workflow", "why did the build fail", "check CI status", "workflow failed", "create a workflow", "add GitHub Actions", or "set up CI".