docs: add PR template convention to AGENTS.md (#272)

Author: avoidwork

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,27 @@
+## Summary
+<!-- Brief description of the changes -->
+
+## Type of Change
+<!-- Mark one with an "x" -->
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature / enhancement
+- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
+- [ ] Documentation update
+- [ ] Build / dependency / tooling change
+- [ ] Test additions or updates
+- [ ] Other
+
+## Related Issues
+<!-- Reference related issues (format: fixes #123, closes #456, or refs #456) -->
+
+## Testing
+<!-- Describe the tests you ran and how to reproduce them -->
+
+## Checklist
+<!-- Mark each with an "x" -->
+- [ ] `npm test` passes
+- [ ] `npm run build` succeeds
+- [ ] 100% test coverage maintained
+- [ ] No hardcoded secrets or credentials introduced
+- [ ] Zero external dependencies added
+- [ ] ES Modules only (no CommonJS in src/)

AGENTS.md

@@ -341,6 +341,10 @@ When auditing or modifying AGENTS.md (or any file):
 3. Push the feature branch and open a PR with `gh pr create --base master`.
 4. Never commit or push directly to `main` or `master`.
 
+### 7.4 Pull Request Templates
+
+If a `.github/PULL_REQUEST_TEMPLATE.md` file exists, it MUST be used when creating PRs. Fill out every section — do not leave any section blank. If a section does not apply, write `N/A` rather than skipping it.
+
 ---
 
 ## 8. Operational Rules