dsh-3d-model-viewer: View 3D Models in DSH, enabling LLMs to understand parts.

# Introduction When using Large Language Models (LLMs) to address mechanical and structural problems, a common obstacle is the model files themselves. Formats such as OBJ, STL, and STEP are either pure geometric data or BREP entities that require a CAD kernel for discretization, meaning pure LLMs often receive nothing but a stream of bytes they cannot understand. Previous solutions either required running a local CAD toolchain to extract results or simply gave up. `dsh-3d-model-viewer` is a plugin in the DeepSeek Harness (DSH) ecosystem. The approach involves splitting the process into two steps: first, rendering the model directly in a web interface for human visualization, and second, translating the same model into a standardized, LLM-readable JSON to be passed to the language model. The following sections introduce its positioning and installation.