修复 master CI 的 Codex CLI 失败状态竞态 (#273)

修复 Codex CLI 子进程提前退出时 stdin BrokenPipe 导致未采集真实退出码的问题。\n\n- BrokenPipe 时继续等待并采集脱敏 stderr\n- 非零退出优先返回真实退出码\n- 保留其他 stdin 错误的快速失败行为\n\n已验证：Codex CLI 失败回归测试、cargo fmt、编码检查、git diff --check。

Reviewed-on: http://192.168.35.82/git/GenarrativeAI/Genarrative/pulls/273
Co-authored-by: kdletters <kdletters@qq.com>
Co-committed-by: kdletters <kdletters@qq.com>

apps/ai-game-creator-shell/src-tauri/src/agent/codex_cli.rs

@@ -666,12 +666,27 @@ async fn request_game_creator_agent_codex_cli_with_executable(
     let mut stdin = child.stdin.take().ok_or_else(|| {
         platform_llm::LlmError::Transport("Codex CLI Agent stdin 未建立".to_string())
     })?;
-    stdin.write_all(prompt.as_bytes()).await.map_err(|error| {
-        platform_llm::LlmError::Transport(format!("写入 Codex CLI Agent prompt 失败：{error}"))
-    })?;
-    stdin.shutdown().await.map_err(|error| {
-        platform_llm::LlmError::Transport(format!("关闭 Codex CLI Agent stdin 失败：{error}"))
-    })?;
+    // 短生命周期 CLI 可能在 prompt 写完前退出；继续采集退出状态和脱敏
+    // stderr，确保调用方拿到可行动的进程错误，而不是平台相关的 BrokenPipe。
+    let mut stdin_error = None;
+    if let Err(error) = stdin.write_all(prompt.as_bytes()).await {
+        if error.kind() == std::io::ErrorKind::BrokenPipe {
+            stdin_error = Some(format!("写入 Codex CLI Agent prompt 失败：{error}"));
+        } else {
+            return Err(platform_llm::LlmError::Transport(format!(
+                "写入 Codex CLI Agent prompt 失败：{error}"
+            )));
+        }
+    }
+    if let Err(error) = stdin.shutdown().await {
+        if error.kind() == std::io::ErrorKind::BrokenPipe {
+            stdin_error.get_or_insert_with(|| format!("关闭 Codex CLI Agent stdin 失败：{error}"));
+        } else {
+            return Err(platform_llm::LlmError::Transport(format!(
+                "关闭 Codex CLI Agent stdin 失败：{error}"
+            )));
+        }
+    }
     drop(stdin);
 
     let stdout = child.stdout.take().ok_or_else(|| {
@@ -744,6 +759,9 @@ async fn request_game_creator_agent_codex_cli_with_executable(
             stderr.sha256
         )));
     }
+    if let Some(error) = stdin_error {
+        return Err(platform_llm::LlmError::Transport(error));
+    }
     parse_game_creator_codex_cli_response(&stdout, &request)
 }