fix docstring missing + better exit if error

src/app/__main__.py

@@ -1,5 +1,6 @@
 import asyncio
 import logging
+import sys
 from dotenv import load_dotenv
 from app.configs import AppConfig
 from app.interface import *
@@ -34,3 +35,4 @@ if __name__ == "__main__":
 
     except Exception as e:
         logging.error(f"Application failed to start: {e}")
+        sys.exit(1)

src/app/configs.py

@@ -154,8 +154,7 @@ class AgentsConfigs(BaseModel):
         Validate that the default models and strategy exist in the provided configurations.
         If any default is not found, a ValueError is raised.
         Args:
-            models: ModelsConfig instance containing all available models.
-            strategies: list of Strategy instances containing all available strategies.
+            configs: the AppConfig instance containing models and strategies.
         Raises:
             ValueError if any default model or strategy is not found.
         """