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DSH 插件：真正便捷无感的同窗口内对话回退，从不新建分支；自带轻量工作区备份，可一并还原文件（完整 Claude Code /rewind 语义）。 · DSH plugin: genuinely effortless in-window conversation rewind — never forking a new session; ships a lightweight workspace backup that restores files together with the rewind (full Claude Code /rewind semantics).