Remove Responses V1 websocket implementation (#13364)

V2 is the way to go!

codex-rs/core/src/codex.rs

@@ -5572,12 +5572,10 @@ async fn run_sampling_request(
             // transient reconnect messages. In debug builds, keep full visibility for diagnosis.
             let report_error = retries > 1
                 || cfg!(debug_assertions)
-                || sess
+                || !sess
                     .services
                     .model_client
-                    .active_ws_version(&turn_context.model_info)
-                    .is_none();
-
+                    .responses_websocket_enabled(&turn_context.model_info);
             if report_error {
                 // Surface retry information to any UI/front‑end so the
                 // user understands what is happening instead of staring
@@ -6418,7 +6416,6 @@ async fn try_run_sampling_request(
             ResponseEvent::Completed {
                 response_id: _,
                 token_usage,
-                can_append: _,
             } => {
                 flush_assistant_text_segments_all(
                     &sess,
@@ -9194,7 +9191,7 @@ mod tests {
         handlers::run_user_shell_command(&session, "sub-id".to_string(), "echo shell".to_string())
             .await;
 
-        let deadline = StdDuration::from_secs(5);
+        let deadline = StdDuration::from_secs(15);
         let start = std::time::Instant::now();
         loop {
             let remaining = deadline.saturating_sub(start.elapsed());