多代理/单代理长 SSE 在长时间无数据时易被掐断，已在流式接口增加定时 SSE 注释保活，并优化前端断线提示与任务栏刷新。多代理时间线增加主编排「第几轮」、子代理「第几步」展示，并为事件标注主/子角色与配色区分；以上仅作用于 SSE 与界面（及可选过程详情存储），不改变发给大模型的对话上下文。
Long-running SSE streams for single- and multi-agent chat could be dropped when idle; we added periodic SSE comment keepalives on the stream endpoints and improved the client message plus task-bar refresh on disconnect. The multi-agent timeline now shows orchestrator round and sub-agent step counts, with role labels and distinct styling; these changes affect the event stream and UI (and optional process-detail persistence) only, not the model’s chat context.