fix(ci): fix black/ruff failures, add CoC and PR template

- Fix Python formatting (sync no longer strips blank lines from .py files)
- Remove test_community_build.py (tests private sync module)
- Fix ruff warnings in test files
- Add CODE_OF_CONDUCT.md
- Add .github/PULL_REQUEST_TEMPLATE.md

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,43 @@
+## Summary
+
+<!-- Brief description of what this PR does -->
+
+## Changes
+
+-
+
+## Type of Change
+
+- [ ] Bug fix (non-breaking change that fixes an issue)
+- [ ] New feature (non-breaking change that adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to change)
+- [ ] Documentation update
+- [ ] Refactoring (no functional changes)
+
+## Plugin(s) Affected
+
+- [ ] Core / System
+- [ ] WordPress
+- [ ] WooCommerce
+- [ ] WordPress Advanced
+- [ ] Gitea
+- [ ] n8n
+- [ ] Supabase
+- [ ] OpenPanel
+- [ ] Appwrite
+- [ ] Directus
+- [ ] Dashboard
+- [ ] None (docs, CI, etc.)
+
+## Testing
+
+- [ ] I have run the test suite (`pytest tests/`)
+- [ ] I have run linting (`black --check . && ruff check .`)
+- [ ] Existing tests pass
+- [ ] I have added tests for new functionality (if applicable)
+
+## Checklist
+
+- [ ] My code follows the project's coding style
+- [ ] I have updated documentation (if applicable)
+- [ ] I have read the [CONTRIBUTING](../CONTRIBUTING.md) guide