feat(planner): persist reusable action semantics

world/model.py

@@ -86,7 +86,9 @@ class WorldModel:
     def _new_state(self) -> WorldState:
         return WorldState.with_history_bound(self.config.history_size)
 
-    def _update_page(self, state: WorldState, semantic_scene: SemanticScene | None) -> None:
+    def _update_page(
+        self, state: WorldState, semantic_scene: SemanticScene | None
+    ) -> None:
         if semantic_scene is None:
             return
         page = semantic_scene.page.strip()
@@ -137,14 +139,22 @@ class WorldModel:
             WorldEvent(
                 action=str(getattr(step, "action", "unknown")),
                 success=bool(getattr(result, "success", False)),
+                arguments=_step_arguments(step),
                 scene_summary=semantic_scene or scene,
                 rationale=getattr(step, "rationale", None),
                 thinking=getattr(step, "thinking", None),
+                purpose=getattr(step, "purpose", None),
+                expected_outcome=getattr(step, "expected_outcome", None),
                 page=state.current_page,
             )
         )
 
 
+def _step_arguments(step: "PlannedStep") -> dict[str, Any]:
+    raw_arguments = getattr(step, "args", {})
+    return dict(raw_arguments) if isinstance(raw_arguments, dict) else {}
+
+
 class TaskWorldView:
     """Per-task handle into a `WorldModel`, scoped explicitly by `task_id`.