Added explanation

Author: are-ces

src/lightspeed_stack.py

@@ -74,6 +74,8 @@ def main() -> None:
             raise SystemExit(1) from e
         return
 
+    # Store config path in env so each uvicorn worker can load it 
+    # (step is needed because process context isn’t shared). 
     os.environ["LIGHTSPEED_STACK_CONFIG_PATH"] = args.config_file
 
     # if every previous steps don't fail, start the service on specified port