comprehensive-review-pr-enhance

# Pull Request Enhancement ## When to Use - You need to turn a git diff into a reviewer-friendly pull request description. - You want a PR summary with change categories, risks, testing notes, and a checklist. - The diff is large enough that reviewers need explicit structure instead of a short ad hoc summary. ## 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 ```markdown ## Summary <!-- one-paragraph executive summary: what changed and why --> ## Changes | Category | Files | Key change | |----------|-------|------------| | source | `src/auth.ts` | added OAuth2 PKCE flow | | test | `tests/auth.test.ts` | covers token refresh edge case | | config | `.env.example` | new `OAUTH_CLIENT_ID` var | ## Why <!-- link to issue/ticket + one sentence on motivation --> ## Testing - [ ] unit tests pass (`npm test`) - [ ] manual smoke test on staging - [ ] no coverage regression ## Risks & Rollback - **Breaking?** yes / no - **Rollback**: revert this commit; no migration needed - **Risk level**: low / medium / high — because ___ ``` ## Review Checklist Rules Add checklist sections only when the matching file category appears in the diff: | File cat...