Pull Request Enhancement

Workflow

1. Run git diff <base>...HEAD --stat to identify changed files and scope
2. Categorise changes: source, test, config, docs, build, styles
3. Generate the PR description using the template below
4. Add a review checklist based on which file categories changed
5. Flag breaking changes, security-sensitive files, or large diffs (>500 lines)

PR Description Template

## Summary
<!-- one-paragraph executive summary: what changed and why -->