fix(#2290): drop redundant async blocks around sync_tmpfiles spawn

hive-c0re/src/actions.rs

@@ -969,7 +969,7 @@ pub async fn destroy(coord: &Arc<Coordinator>, name: &str, purge: bool) -> Resul
     coord.emit_schedules_snapshot();
     // Update tmpfiles.d to remove the destroyed agent's dirs from the
     // boot-time pre-creation list. Best-effort: failure is logged only.
-    tokio::spawn(async { lifecycle::sync_tmpfiles().await });
+    tokio::spawn(lifecycle::sync_tmpfiles());
     Ok(())
 }