protocol: drop legacy sandbox from user turns

codex-rs/core/src/guardian/review_session.rs

@@ -713,7 +713,6 @@ async fn run_review_on_session(
             cwd: params.parent_turn.cwd.to_path_buf(),
             approval_policy: AskForApproval::Never,
             approvals_reviewer: None,
-            sandbox_policy: None,
             permission_profile,
             model: params.model.clone(),
             effort: params.reasoning_effort,

codex-rs/core/src/session/handlers.rs

@@ -134,7 +134,6 @@ pub(super) async fn user_input_or_turn_inner(
             cwd,
             approval_policy,
             approvals_reviewer,
-            sandbox_policy: _,
             permission_profile,
             model,
             effort,

codex-rs/core/src/session/tests.rs

@@ -4247,7 +4247,6 @@ async fn user_turn_updates_approvals_reviewer() {
             cwd: config.cwd.to_path_buf(),
             approval_policy: config.permissions.approval_policy.value(),
             approvals_reviewer: Some(codex_config::types::ApprovalsReviewer::AutoReview),
-            sandbox_policy: None,
             permission_profile: config.permissions.permission_profile(),
             model: turn_context.model_info.slug.clone(),
             effort: config.model_reasoning_effort,