Make exec review policy params test hermetic

codex-rs/exec/src/lib_tests.rs

@@ -346,6 +346,7 @@ async fn thread_start_params_include_review_policy_when_review_policy_is_manual_
     let cwd = tempdir().expect("create temp cwd");
     let config = ConfigBuilder::default()
         .codex_home(codex_home.path().to_path_buf())
+        .loader_overrides(LoaderOverrides::without_managed_config_for_tests())
         .harness_overrides(ConfigOverrides {
             approvals_reviewer: Some(ApprovalsReviewer::User),
             ..Default::default()