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>

core/endpoints/registry.py

@@ -21,6 +21,7 @@ from .factory import MCPEndpointFactory
 
 logger = logging.getLogger(__name__)
 
+
 @dataclass
 class EndpointInfo:
     """Information about a registered endpoint"""
@@ -33,6 +34,7 @@ class EndpointInfo:
     plugin_types: list[str]
     require_master_key: bool
 
+
 class EndpointRegistry:
     """
     Central registry for all MCP endpoints.
@@ -199,9 +201,11 @@ class EndpointRegistry:
         logger.info(f"Total: {len(self._endpoints)} endpoints")
         logger.info("=" * 60)
 
+
 # Singleton instance
 _registry: EndpointRegistry | None = None
 
+
 def get_endpoint_registry() -> EndpointRegistry:
     """Get the global endpoint registry instance"""
     global _registry
@@ -211,6 +215,7 @@ def get_endpoint_registry() -> EndpointRegistry:
         )
     return _registry
 
+
 def initialize_endpoint_registry(factory: MCPEndpointFactory) -> EndpointRegistry:
     """
     Initialize the global endpoint registry.