dsh-sphere: Sphere Calculation Plugin

The DeepSeek Harness plugin dsh-sphere focuses on spherical geometry calculations, implemented in pure Node.js without requiring internet access. Maintained by istone, the plugin aims to provide lightweight, network-independent local computation for agent reasoning. Users can install it via the official command and invoke the corresponding tools directly within a DSH session. Before installation, ensure that the source code complies with the MIT license and that the environment meets the Node.js runtime requirements.