fix: scope MCP configuration to Codex and stabilize Windows launchers

tests/unit/test_windows_bootstrap.py

@@ -146,3 +146,30 @@ def test_batch_preserves_exit_code_and_handles_space_and_exclamation_paths(tmp_p
         timeout=30,
     )
     assert result.returncode == exit_code, result.stdout + result.stderr
+
+
+@pytest.mark.parametrize("exit_code", [0, 7])
+def test_chinese_batch_prints_complete_lines_and_preserves_exit_code(tmp_path, exit_code):
+    root = tmp_path / "source with spaces!"
+    root.mkdir()
+    shutil.copy2(ROOT / "start-cn.bat", root / "start-cn.bat")
+    (root / "start.bat").write_bytes(
+        f'@echo off\r\nif not "%~1"=="-Mirror" exit /b 19\r\n'
+        f'if not "%~2"=="China" exit /b 20\r\nexit /b {exit_code}\r\n'.encode("ascii")
+    )
+    result = subprocess.run(
+        ["cmd.exe", "/d", "/c", "call", str(root / "start-cn.bat")],
+        capture_output=True,
+        timeout=15,
+    )
+    assert result.returncode == exit_code, result.stdout + result.stderr
+    assert not result.stderr, result.stderr
+    assert "镜像地址和下载超时可在" in result.stdout.decode("utf-8")
+    help_result = subprocess.run(
+        ["cmd.exe", "/d", "/c", "call", str(root / "start-cn.bat"), "-Help"],
+        capture_output=True,
+        timeout=15,
+    )
+    assert help_result.returncode == 0
+    assert not help_result.stderr
+    assert "Codex MCP" in help_result.stdout.decode("utf-8")