feat: pass codex thread ID in notifier metadata (#4582)

codex-rs/core/src/codex.rs

@@ -1858,6 +1858,7 @@ pub(crate) async fn run_task(
                     );
                     sess.notifier()
                         .notify(&UserNotification::AgentTurnComplete {
+                            thread_id: sess.conversation_id.to_string(),
                             turn_id: sub_id.clone(),
                             input_messages: turn_input_messages,
                             last_assistant_message: last_agent_message.clone(),