feat(stage): complete phase 20b action plans

tests/test_phase20a_identity.gd

@@ -170,7 +170,7 @@ func _test_adapter_identity_round_trip() -> void:
 		"stk_path": "res://content/stickmen/phase20a_missing_character.stk",
 		"position": {"x": -360.0, "y": 0.0},
 		"rotation": 0.0,
-		"action_queue": [],
+		"action_plan": [],
 	}
 	var missing_character: Node2D = MISSING_STICKMAN.new() as Node2D
 	missing_character.configure(missing_character_entry)
@@ -282,6 +282,10 @@ func _object(file_id: String, object_type: String, stage_id: String, stage_name:
 
 
 func _current_document(objects: Array) -> Dictionary:
+	for raw_object: Variant in objects:
+		if raw_object is Dictionary and String((raw_object as Dictionary).get("type", "")) == "stickman":
+			(raw_object as Dictionary)["action_plan"] = []
+			(raw_object as Dictionary).erase("action_queue")
 	return {
 		"version": STAGE_SCENE_IO.FILE_VERSION,
 		"scene_name": "Identity Test",