Fix: Resolve UnboundLocalError in write_file

src/nacc_orchestrator/service.py

@@ -257,13 +257,13 @@ class OrchestratorService:
         
         self.audit.record(
             "write_file",
-            node=node_def.node_id,
+            node=target_node_id,
             path=path,
             content_length=len(content)
         )
         
         return {
-            "node_id": node_def.node_id,
+            "node_id": target_node_id,
             "path": path,
             "success": response.get("success", False),
             "message": response.get("message", ""),