dsh-plugin-session-rollback: Synchronized Rollback of Session and Workspace Code

`dsh-plugin-session-rollback` is a DeepSeek Harness plugin maintained by antlordGit, designed to address the pain point of rolling back conversations and code during development and debugging. By creating SHA-256 content-addressed code checkpoints for each user prompt, it enables atomic synchronized rollback of session records and workspace code. Users only need to click the “Undo” button next to a user message to remove that prompt and all subsequent content, automatically restoring the code to its state before the prompt. It also supports undoing the most recent rollback with the `/rollback-undo` command. The installation command is `dsh plugin --profile web add github:antlordGit/dsh-plugin-se