Preserve task details on unavailable handoffs

src/services/service-registry.ts

@@ -947,6 +947,9 @@ function unavailableServiceRoute(input: CuratorRouteInput) {
   return appendQuery("/agents/service-unavailable", {
     ...curatorBaseParams(input),
     serviceId: input.serviceId,
+    taskTitle: input.taskTitle,
+    taskSubtitle: input.taskSubtitle,
+    taskType: input.taskType,
   });
 }