feat: attended PR comments

main.py

@@ -15,7 +15,7 @@ from google import genai
 from google.genai import types as genai_types
 from mcp.server.fastmcp import Context, FastMCP
 
-from utils import Settings, _args, log_structured_entry
+from utils import Settings, _args, cfg, log_structured_entry
 
 HTTP_TOO_MANY_REQUESTS = 429
 HTTP_SERVER_ERROR = 500
@@ -624,8 +624,6 @@ async def lifespan(_server: FastMCP) -> AsyncIterator[AppContext]:
         log_structured_entry("MCP server lifespan ending", "INFO")
 
 
-cfg = Settings.model_validate({})
-
 mcp = FastMCP(
     "knowledge-search",
     host=_args.host,