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/middleware.py

@@ -24,6 +24,7 @@ from .config import EndpointConfig
 
 logger = logging.getLogger(__name__)
 
+
 @dataclass
 class AuthContext:
     """Authentication context for a request"""
@@ -35,6 +36,7 @@ class AuthContext:
     is_oauth_token: bool = False
     client_ip: str | None = None
 
+
 class EndpointAuthMiddleware(Middleware):
     """
     Authentication middleware for multi-endpoint architecture.
@@ -256,6 +258,7 @@ class EndpointAuthMiddleware(Middleware):
         duration_ms = int((time.time() - start_time) * 1000)
         logger.warning(f"Tool {tool_name} failed: {error} (duration={duration_ms}ms)")
 
+
 class EndpointRateLimitMiddleware(Middleware):
     """
     Rate limiting middleware for multi-endpoint architecture.
@@ -285,6 +288,7 @@ class EndpointRateLimitMiddleware(Middleware):
         # Proceed with request
         return await call_next(context)
 
+
 class EndpointAuditMiddleware(Middleware):
     """
     Audit logging middleware for multi-endpoint architecture.
@@ -333,6 +337,7 @@ class EndpointAuditMiddleware(Middleware):
             )
             raise
 
+
 def create_endpoint_middleware(endpoint_config: EndpointConfig) -> list:
     """
     Create middleware stack for an endpoint.