dsh-drawai: An Editable Canvas and AI Image Editing Tool for the DSH Right Sidebar

`dsh-drawai` is a diagramming plugin for DeepSeek Harness, designed to address the disconnect between diagramming and conversation. It provides an editable canvas in the right sidebar and the `diagram_read` and `diagram_apply` tools, enabling the model to directly read and write the same `.drawio` file. It supports node creation, edge connections, and diagram modification via natural language. The plugin offers capabilities such as SVG node insertion, bitmap vectorization, selection awareness, optimistic locking to prevent concurrent conflicts, and preservation of unknown content. After installation, restart `dsh web` to take effect. It is compatible with the native Draw.io format at the underlying level, providing a closed-loop diagramming solution for models.