Normalize responses SSE events for Codex

scripts/test-gateway-e2e.mjs

@@ -1043,6 +1043,26 @@ async function run() {
     assert(streamDisconnectedRetryResponse.status === 200, `stream disconnected capacity 抖动后未自动恢复: ${streamDisconnectedRetryResponse.status}`);
     assert(streamDisconnectedRetryText.includes("hello"), "stream disconnected capacity 恢复后未拿到正常 SSE 内容");
 
+    const normalizedFailureStream = await readSseUntilClose(
+      `http://127.0.0.1:${gatewayPort}/responses`,
+      {
+        stream: true,
+        test_capacity_before_success_times: 1,
+        test_capacity_message: "Permanent upstream failure for codex normalization test.",
+        test_capacity_stream_event_name: "error",
+        test_capacity_stream_payload_shape: "default",
+      },
+    );
+    assert(normalizedFailureStream.status === 200, `非重试 fatal stream 首状态异常: ${normalizedFailureStream.status}`);
+    assert(
+      normalizedFailureStream.text.includes('"type":"response.failed"'),
+      "非重试 fatal stream 未归一化为 response.failed",
+    );
+    assert(
+      !normalizedFailureStream.text.includes('"type":"error"'),
+      "非重试 fatal stream 不应继续透传 type=error",
+    );
+
     for (const streamPath of [
       "/responses",
       "/v1/responses",
@@ -1065,10 +1085,16 @@ async function run() {
       const okStream = await readSseUntilClose(
         `http://127.0.0.1:${gatewayPort}${streamPath}`,
         { stream: true, test_reasoning_tokens: 128 },
-      );
+      );
       assert(okStream.status === 200, `${streamPath} 128 首状态异常: ${okStream.status}`);
       assert(okStream.text.includes("[DONE]"), `${streamPath} 流式 128 未完整结束`);
       assert(!okStream.closedByError, `${streamPath} 流式 128 不应异常断开`);
+      if (streamPath === "/responses" || streamPath === "/v1/responses") {
+        assert(
+          okStream.text.includes('"type":"response.completed"'),
+          `${streamPath} 成功流未补 response.completed`,
+        );
+      }
 
       if (streamPath === "/responses" || streamPath === "/v1/responses") {
         const replayedStream = await readSseUntilClose(