feat: support force completed goals in semantic belief agent

ref: N25B-427

src/control_backend/schemas/program.py

@@ -15,6 +15,9 @@ class ProgramElement(BaseModel):
     name: str
     id: UUID4
 
+    # To make program elements hashable
+    model_config = {"frozen": True}
+
 
 class LogicalOperator(Enum):
     AND = "AND"
@@ -105,23 +108,33 @@ class Plan(ProgramElement):
     steps: list[PlanElement]
 
 
-class Goal(ProgramElement):
+class BaseGoal(ProgramElement):
     """
-    Represents an objective to be achieved. To reach the goal, we should execute
-    the corresponding plan. If we can fail to achieve a goal after executing the plan,
-    for example when the achieving of the goal is dependent on the user's reply, this means
-    that the achieved status will be set from somewhere else in the program.
+    Represents an objective to be achieved. This base version does not include a plan to achieve
+    this goal, and is used in semantic belief extraction.
 
     :ivar description: A description of the goal, used to determine if it has been achieved.
-    :ivar plan: The plan to execute.
     :ivar can_fail: Whether we can fail to achieve the goal after executing the plan.
     """
 
     description: str = ""
-    plan: Plan
     can_fail: bool = True
 
 
+class Goal(BaseGoal):
+    """
+    Represents an objective to be achieved. To reach the goal, we should execute the corresponding
+    plan. It inherits from the BaseGoal a variable `can_fail`, which if true will cause the
+    completion to be determined based on the conversation.
+
+    Instances of this goal are not hashable because a plan is not hashable.
+
+    :ivar plan: The plan to execute.
+    """
+
+    plan: Plan
+
+
 type Action = SpeechAction | GestureAction | LLMAction