dsh-open-in: Open Workspaces Directly in the DeepSeek Harness Web Interface

`dsh-open-in` is a DeepSeek Harness (DSH) plugin that invokes local tools directly from the Web interface to open the current workspace. It requires no build step and, by configuring a target command (such as VS Code or a terminal), passes the workspace’s absolute path to the host application. The plugin supports cross-platform use, menu integration, and configuration overrides, enabling a seamless connection between the Web interface and the local development environment.