fix: drop unused AsyncReadExt and update integration test

Author: DaleSeo

crates/rmcp/src/transport/async_rw.rs

@@ -619,7 +619,7 @@ mod test {
     #[cfg(feature = "server")]
     #[tokio::test]
     async fn receive_recovers_from_parse_error() {
-        use tokio::io::{AsyncReadExt, AsyncWriteExt};
+        use tokio::io::AsyncWriteExt;
 
         use crate::{RoleServer, transport::Transport};
 

crates/rmcp/tests/test_client_initialization.rs

@@ -30,7 +30,7 @@ async fn test_client_init_handles_jsonrpc_error() {
 
         let error_msg = ServerJsonRpcMessage::Error(JsonRpcError {
             jsonrpc: JsonRpcVersion2_0,
-            id: RequestId::Number(1),
+            id: Some(RequestId::Number(1)),
             error: ErrorData {
                 code: ErrorCode(-32600),
                 message: Cow::Borrowed("Invalid Request"),