[Rust] Allow resuming a session that was killed with ctrl + c (#1387)

Previously, if you ctrl+c'd a conversation, all subsequent turns would
400 because the Responses API never got a response for one of its call
ids. This ensures that if we aren't sending a call id by hand, we
generate a synthetic aborted call.

Fixes #1244 


https://github.com/user-attachments/assets/5126354f-b970-45f5-8c65-f811bca8294a

codex-rs/core/src/client.rs

@@ -168,7 +168,7 @@ impl ModelClient {
                     // negligible.
                     if !(status == StatusCode::TOO_MANY_REQUESTS || status.is_server_error()) {
                         // Surface the error body to callers. Use `unwrap_or_default` per Clippy.
-                        let body = (res.text().await).unwrap_or_default();
+                        let body = res.text().await.unwrap_or_default();
                         return Err(CodexErr::UnexpectedStatus(status, body));
                     }
 
@@ -208,6 +208,9 @@ struct SseEvent {
     item: Option<Value>,
 }
 
+#[derive(Debug, Deserialize)]
+struct ResponseCreated {}
+
 #[derive(Debug, Deserialize)]
 struct ResponseCompleted {
     id: String,
@@ -335,6 +338,11 @@ where
                     return;
                 }
             }
+            "response.created" => {
+                if event.response.is_some() {
+                    let _ = tx_event.send(Ok(ResponseEvent::Created {})).await;
+                }
+            }
             // Final response completed – includes array of output items & id
             "response.completed" => {
                 if let Some(resp_val) = event.response {
@@ -350,7 +358,6 @@ where
                 };
             }
             "response.content_part.done"
-            | "response.created"
             | "response.function_call_arguments.delta"
             | "response.in_progress"
             | "response.output_item.added"