feat(planner): persist reusable action semantics

world/models.py

@@ -14,21 +14,29 @@ from world.config import DEFAULT_HISTORY_SIZE
 class WorldEvent:
     action: str
     success: bool
+    arguments: dict[str, Any] = field(default_factory=dict)
     # Optional for backward compatibility; new entries created by AIPlanner
     # paths leave this as None and use rationale/thinking instead.
     scene_summary: SemanticScene | Scene | None = None
     rationale: str | None = None
     thinking: str | None = None
+    purpose: str | None = None
+    expected_outcome: str | None = None
     page: str | None = None
     timestamp: datetime = field(default_factory=utc_now)
 
     def to_dict(self) -> dict[str, Any]:
         return {
-            "scene_summary": self.scene_summary.to_dict() if self.scene_summary is not None else None,
+            "scene_summary": self.scene_summary.to_dict()
+            if self.scene_summary is not None
+            else None,
             "action": self.action,
+            "arguments": dict(self.arguments),
             "success": self.success,
             "rationale": self.rationale,
             "thinking": self.thinking,
+            "purpose": self.purpose,
+            "expected_outcome": self.expected_outcome,
             "page": self.page,
             "timestamp": self.timestamp.isoformat(),
         }