add watch

crates/rshc/src/auth.rs

@@ -127,6 +127,9 @@ impl AuthedClient {
                     _ => {}
                 }
             }
+            // Signal all pending callers that the connection is gone.
+            pending_r.lock().await.clear();
+            *events_tx_r.lock().await = None;
         });
 
         Ok(Self {
@@ -147,7 +150,7 @@ impl AuthedClient {
             .send(OpMsg::Req { id, body })
             .await
             .map_err(|_| anyhow!("send failed (connection closed)"))?;
-        rx.await.map_err(|_| anyhow!("response dropped"))
+        rx.await.map_err(|_| anyhow!("backend disconnected"))
     }
 
     pub async fn req_stream(&self, body: OpReq) -> Result<(u64, mpsc::Receiver<OpResp>)> {