Fix stdio transport clippy issues

Keep the stack-introduced stdio transport variant explicit while avoiding dead-code and redundant-pattern lints reported by PR20664 CI.

Co-authored-by: Codex <noreply@openai.com>

codex-rs/exec-server/src/client_api.rs

@@ -49,6 +49,7 @@ pub(crate) struct StdioExecServerCommand {
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub(crate) enum ExecServerTransportParams {
     WebSocketUrl(String),
+    #[allow(dead_code)]
     StdioCommand(StdioExecServerCommand),
 }
 

codex-rs/exec-server/src/connection.rs

@@ -26,14 +26,16 @@ pub(crate) enum JsonRpcConnectionEvent {
 
 pub(crate) enum JsonRpcTransport {
     Plain,
-    Stdio(StdioTransport),
+    Stdio { _transport: StdioTransport },
 }
 
 impl JsonRpcTransport {
     fn from_child_process(child_process: Child) -> Self {
-        Self::Stdio(StdioTransport {
-            child_process: Some(child_process),
-        })
+        Self::Stdio {
+            _transport: StdioTransport {
+                child_process: Some(child_process),
+            },
+        }
     }
 }
 

codex-rs/exec-server/src/rpc.rs

@@ -235,7 +235,7 @@ impl RpcClient {
     pub(crate) fn new(connection: JsonRpcConnection) -> (Self, mpsc::Receiver<RpcClientEvent>) {
         let JsonRpcConnection {
             outgoing_tx: write_tx,
-            incoming_rx: mut incoming_rx,
+            mut incoming_rx,
             disconnected_rx,
             task_handles: transport_tasks,
             transport,

codex-rs/exec-server/src/server/processor.rs

@@ -49,8 +49,8 @@ async fn run_connection(
     let router = Arc::new(build_router());
     let JsonRpcConnection {
         outgoing_tx: json_outgoing_tx,
-        incoming_rx: mut incoming_rx,
-        disconnected_rx: mut disconnected_rx,
+        mut incoming_rx,
+        mut disconnected_rx,
         task_handles: connection_tasks,
         transport: _transport,
     } = connection;