fix: disable private desktop for harness sandbox

tests/test_execute.py

@@ -35,8 +35,13 @@ def test_invoke_codex_uses_utf8_for_unicode_prompt(tmp_path, monkeypatch):
     assert "Euler–Bernoulli 보" in invocation["kwargs"]["input"]
     assert invocation["kwargs"]["encoding"] == "utf-8"
     if execute.os.name == "nt":
-        config_index = invocation["command"].index("-c")
-        assert invocation["command"][config_index + 1] == 'windows.sandbox="unelevated"'
+        configs = [
+            invocation["command"][index + 1]
+            for index, argument in enumerate(invocation["command"][:-1])
+            if argument == "-c"
+        ]
+        assert 'windows.sandbox="unelevated"' in configs
+        assert "windows.sandbox_private_desktop=false" in configs
 
 
 def test_run_git_decodes_output_as_utf8(tmp_path, monkeypatch):