sync

DeepSeek Harness（DSH）备份/恢复 + 跨机同步插件：本地快照、WebDAV 推送/拉取、自动备份与失效归档清理。Snapshot backup, restore and cross-machine sync plugin for DeepSeek Harness: local snapshots, incremental WebDAV push/pull, auto-backup retention and stale archive sweep.