test(config): isolate load_config no-args test by monkeypatching cwd to tmp_path

Author: elkaix

tests/core/test_config.py

@@ -611,8 +611,8 @@ def test_load_config_explicit_path_bypasses_scoping(tmp_path):
 def test_load_config_no_args_uses_scope_resolution(tmp_path, monkeypatch):
     """load_config() with no args routes through scoped pipeline."""
     monkeypatch.setenv("PYTHINKER_SHARE_DIR", str(tmp_path))
+    monkeypatch.chdir(tmp_path)  # no .git in tmp_path → user-only scope
     (tmp_path / "config.toml").write_text('theme = "light"\n', encoding="utf-8")
-    # No git root in tmp_path — falls back to user-only
     config = load_config()
     assert config.theme == "light"
     assert "user" in config.source_scopes