Document incremental Smart heartbeat reviews, evidence-backed suggestions, interrupted-turn history, floating checklists, and note save behavior. Record schema 50 backup requirements and real Host cancellation validation; Agent remains 0.15.1. Release note: 智能心跳按变化回顾并提供有依据的建议，修复取消后续聊、清单展开和笔记保存体验；升级前请备份数据库及笔记。
