feat: add GitHub pull request template

Add practical PR template tailored to docs-v2 monorepo structure and workflow. Template includes sections for documentation scope, local validation commands, style compliance, and impact assessment.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: btiernay

.github/pull_request_template.md

@@ -0,0 +1,52 @@
+## Summary
+
+Briefly describe what this PR changes and why. If this touches multiple documentation sites (`main/` and `auth4genai/`), call that out.
+
+## Documentation scope
+
+**Site(s) affected:**
+- [ ] `main/` - Auth0 main documentation
+- [ ] `auth4genai/` - Auth0 for AI Agents documentation
+- [ ] `ui/` - Shared component library
+- [ ] Infrastructure/tooling
+
+**Type of change:**
+- [ ] New documentation
+- [ ] Update to existing documentation
+- [ ] Navigation/information architecture change
+- [ ] Code examples or snippets
+- [ ] UI component or Mintlify configuration
+- [ ] Linting/tooling/workflows
+
+## Verification
+
+**Local validation:**
+- [ ] Ran `mint dev` in affected docs folder(s)
+- [ ] Checked for broken links with `mint broken-links` (if applicable)
+- [ ] Verified accessibility with `mint a11y` (if applicable)
+- [ ] Built UI library with `npm run build` (if UI changes)
+
+**Style compliance:**
+- [ ] Follows placeholder conventions (`YOUR_SOMETHING`, `<id-value>`)
+- [ ] Uses correct Auth0 terminology and sentence case for headings
+- [ ] Code blocks include language and filename where appropriate
+- [ ] All images wrapped in `<Frame>` components
+
+## Impact and dependencies
+
+**User-facing changes:**
+- Does this introduce new pages, remove pages, or change URLs?
+- Does this document a new feature, Early Access capability, or breaking change?
+- Are there plan restrictions (Enterprise/Professional) that need callouts?
+
+**Dependencies:**
+- Are there related PRs, feature flags, or release timing considerations?
+- Does this require coordination with Product, Legal, or Security teams?
+
+**Follow-up required:**
+- [ ] No follow-up needed
+- [ ] Follow-up issue/PR needed (describe below)
+
+## Additional context
+
+Add any other context, screenshots, or preview links that help reviewers.