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>

plugins/woocommerce/plugin.py

@@ -24,6 +24,7 @@ from plugins.wordpress.handlers import (
     get_reports_specs,
 )
 
+
 class WooCommercePlugin(BasePlugin):
     """
     WooCommerce E-commerce Plugin.