fix(app): 停止串流 Codex transcript

app/main.js

@@ -215,8 +215,6 @@ function runCodex(model, prompt) {
       output.append(Buffer.from(`Codex execution timed out after ${timeoutMs} ms.\n`));
     }, timeoutMs);
 
-    child.stderr.pipe(process.stdout);
-
     child.stdout.on("data", (chunk) => {
       output.append(chunk);
     });
@@ -239,14 +237,11 @@ function runCodex(model, prompt) {
         output.append(Buffer.from(`Codex process terminated by signal ${signal}.\n`));
       }
 
-      let lastMessage = "";
-      try {
-        lastMessage = fs.readFileSync(lastMessageFile, "utf8");
-      } catch {
-        lastMessage = "";
-      }
+      const lastMessage = fs.existsSync(lastMessageFile) ? fs.readFileSync(lastMessageFile, "utf8") : null;
+      const diagnosticOutput = output.toString();
+      const resultOutput = code === 0 && lastMessage !== null ? lastMessage : diagnosticOutput || lastMessage || "";
 
-      resolve({ status: code ?? 1, output: lastMessage || output.toString() });
+      resolve({ status: code ?? 1, output: resultOutput });
     });
   });
 }