dsh-worktree-panel: Git worktree and branch management panel for DSH Web

dsh-worktree-panel is a DSH plugin maintained by HeathHe, licensed under MIT, designed for managing Git worktrees and branches within the DeepSeek Harness Web GUI. This plugin extends the workspace sidebar, organizing projects, main worktrees, branch worktrees, and sessions into a clear hierarchy. It supports launching sessions within worktrees, deleting worktrees, switching branches, and creating worktrees for existing or new branches. Default worktrees are stored in the `.dsh/workspaces/` directory under the project path, with support for custom paths and automatic migration detection (skipping worktrees with uncommitted changes or active sessions). For non-Git folders, it allows direct session initiation and provides