open-source-quality

Use this skill before committing, pushing, or opening a PR. Triggers on phrases like "commit", "git commit", "push", "open PR", "create pull request", "finalize this change". Enforces conventional commit messages, atomic commits, code style (ruff/mypy), public-API docstrings, actionable error messages, changelog discipline, and backwards-compat warnings. Refuses to declare commits ready without passing these checks.