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/wordpress_advanced/plugin.py

@@ -17,6 +17,7 @@ from plugins.base import BasePlugin
 from plugins.wordpress.client import WordPressClient
 from plugins.wordpress_advanced import handlers
 
+
 class WordPressAdvancedPlugin(BasePlugin):
     """
     WordPress Advanced plugin - separated for security and visibility.