feat: TUI undo op (#5629)

codex-rs/mcp-server/src/codex_tool_runner.rs

@@ -288,6 +288,8 @@ async fn run_codex_tool_session_inner(
                     | EventMsg::EnteredReviewMode(_)
                     | EventMsg::ItemStarted(_)
                     | EventMsg::ItemCompleted(_)
+                    | EventMsg::UndoStarted(_)
+                    | EventMsg::UndoCompleted(_)
                     | EventMsg::ExitedReviewMode(_) => {
                         // For now, we do not do anything extra for these
                         // events. Note that