Revert "[core] add optional status_code to error events (#6865)" (#6955)

This reverts commit c2ec477d93.

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https://github.com/openai/codex/blob/main/docs/contributing.md

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codex-rs/core/src/codex.rs

@@ -66,7 +66,6 @@ use crate::context_manager::ContextManager;
 use crate::environment_context::EnvironmentContext;
 use crate::error::CodexErr;
 use crate::error::Result as CodexResult;
-use crate::error::http_status_code_value;
 #[cfg(test)]
 use crate::exec::StreamOutput;
 use crate::mcp::auth::compute_auth_statuses;
@@ -80,6 +79,7 @@ use crate::protocol::ApplyPatchApprovalRequestEvent;
 use crate::protocol::AskForApproval;
 use crate::protocol::BackgroundEventEvent;
 use crate::protocol::DeprecationNoticeEvent;
+use crate::protocol::ErrorEvent;
 use crate::protocol::Event;
 use crate::protocol::EventMsg;
 use crate::protocol::ExecApprovalRequestEvent;
@@ -134,7 +134,6 @@ use codex_protocol::user_input::UserInput;
 use codex_utils_readiness::Readiness;
 use codex_utils_readiness::ReadinessFlag;
 use codex_utils_tokenizer::warm_model_cache;
-use reqwest::StatusCode;
 
 /// The high-level interface to the Codex system.
 /// It operates as a queue pair where you send submissions and receive events.
@@ -1197,11 +1196,9 @@ impl Session {
         &self,
         turn_context: &TurnContext,
         message: impl Into<String>,
-        http_status_code: Option<StatusCode>,
     ) {
         let event = EventMsg::StreamError(StreamErrorEvent {
             message: message.into(),
-            http_status_code: http_status_code_value(http_status_code),
         });
         self.send_event(turn_context, event).await;
     }
@@ -1693,7 +1690,6 @@ mod handlers {
                 id: sub_id.clone(),
                 msg: EventMsg::Error(ErrorEvent {
                     message: "Failed to shutdown rollout recorder".to_string(),
-                    http_status_code: None,
                 }),
             };
             sess.send_event_raw(event).await;
@@ -1948,8 +1944,10 @@ pub(crate) async fn run_task(
             }
             Err(e) => {
                 info!("Turn error: {e:#}");
-                sess.send_event(&turn_context, EventMsg::Error(e.to_error_event(None)))
-                    .await;
+                let event = EventMsg::Error(ErrorEvent {
+                    message: e.to_string(),
+                });
+                sess.send_event(&turn_context, event).await;
                 // let the user continue the conversation
                 break;
             }
@@ -2073,7 +2071,6 @@ async fn run_turn(
                     sess.notify_stream_error(
                         &turn_context,
                         format!("Reconnecting... {retries}/{max_retries}"),
-                        e.http_status_code(),
                     )
                     .await;