dsh-git-workbench: DeepSeek Harness's Git and GitHub PR Workbench

`dsh-git-workbench` is an experimental workflow plugin for DeepSeek Harness (DSH) developed by FlutterSoul, designed to integrate Git and GitHub PR workflows into the DSH agent and web client. The plugin provides a unified sidebar panel and model tools, supporting repository status viewing, diff comparison, branch management, commit operations, and the full lifecycle management of GitHub PRs (including creation, editing, merging, and commenting). It interacts with Git via the GitHub CLI without storing tokens, emphasizing security measures such as disabling force pushes, preventing concurrent overwrites, and restricting the command execution environment. Installation requires Node.js 22.19+ or 24+ and DSH 0.1.0-rc.6, and can be accessed via...