Add docs governance and Czech parity updates

.github/pull_request_template.md

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+# Pull Request
+
+## Summary
+
+Describe what changed and why.
+
+## Type of Change
+
+- [ ] Translation update
+- [ ] Canonical content update
+- [ ] Formatting/link cleanup
+- [ ] Governance/process update
+- [ ] Other (describe in summary)
+
+## Checklist
+
+- [ ] Linked issue (required for material charter/codex/ethics changes)
+- [ ] Local markdown links validated (`./scripts/check_markdown_links.sh`)
+- [ ] Translation parity checked (`./scripts/translation_parity_report.sh`)
+- [ ] Files preserve structure/section order where translation parity is expected
+- [ ] Intentional localization differences are explained (if any)
+
+## Affected Files
+
+List key paths changed in this PR.
+
+## Notes for Reviewers
+
+Call out anything that needs focused review (wording, doctrine interpretation, terminology, etc.).