caoxiaozhu
e9d7c56d5b
feat(server): 会话上下文保留（LLM 历史 + 确定性兜底双保险）
解决用户删除草稿后说'再提交'丢失上下文的问题：
- steward.py 新增 _inject_recent_conversation_history：build_plan 前读最近 10 条对话注入 context_json
- steward_intent_agent.py 的 _build_messages 把 recent_history 暴露给模型，system prompt 加确认类话术引导
- 新建 steward_context_resume.py：should_resume_recent_task 检测'再提交'类话术 + state 有可恢复 flow，attach_resumed_task 从 state 恢复 task
- 两个 plan 入口（/plans 和 /plans/stream）都已接入双保险
- 后端 67 passed，端到端验证'上海出差→再提交'成功恢复 task
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