feat: fully implemented visual emotion recognition agent in pipeline

ref: N25B-393

src/control_backend/schemas/belief_message.py

@@ -8,11 +8,13 @@ class Belief(BaseModel):
     :ivar name: The functor or name of the belief (e.g., 'user_said').
     :ivar arguments: A list of string arguments for the belief.
     :ivar replace: If True, existing beliefs with this name should be replaced by this one.
+    :ivar remove: If True, this belief should be removed from the belief base.
     """
 
     name: str
     arguments: list[str]
     replace: bool = False
+    remove: bool = False
 
 
 class BeliefMessage(BaseModel):