update AI and doc

core/ai/framework/state_machine.gd

@@ -5,33 +5,48 @@ class_name StateMachine
 @export var initial_state: State
 
 var current_state: State
-var states: Dictionary = {}
-var enable: bool = true:
+var states: Dictionary[StringName, State] = {}
+var is_initialized: bool = false
+var _enabled: bool = true
+var enable: bool:
 	set(value):
-		enable = value
-		toggle_enable()
+		_enabled = value
+		_set_enabled(value)
+	get:
+		return _enabled
 
-func toggle_enable() -> void:
-	if !enable:
-		return
-	
-	if !states.is_empty():
+func _ready() -> void:
+	_initialize_states()
+	_set_enabled(enable)
+
+func _initialize_states() -> void:
+	if is_initialized:
 		return
 
 	for state in get_children():
 		if state is State:
 			states[state.state_id] = state
 			state.transitioned.connect(_on_state_transition)
-	
-	if initial_state:
+
+	is_initialized = true
+
+func _set_enabled(value: bool) -> void:
+	_enabled = value
+
+	if not _enabled:
+		return
+
+	_initialize_states()
+
+	if initial_state and current_state == null:
 		current_state = initial_state
 		current_state.enter()
 
 func physics_process(delta) -> void:
-	if current_state and enable:
-		current_state.update(delta)
+	if current_state and _enabled:
+		current_state.physics_update(delta)
 
-func _on_state_transition(state: State, new_state_id: String) -> void:
+func _on_state_transition(state: State, new_state_id: StringName) -> void:
 	if state != current_state:
 		return