dsh-lanthanum: DSH Plugin for Lanthanum

`dsh-lanthanum` (lanthanum element) is a plugin for DeepSeek Harness (DSH) designed to provide a pure Node.js solution without requiring network access. The plugin runs entirely locally, does not depend on external network resources, and is especially suitable for restricted network environments. Before installing, it must meet the dependencies `@deepseek-ai/cordis` (^4.0.1) and `@deepseek-ai/dsh-tools` (>=0.1.0-rc.6). The installation command is `dsh plugin add github:uckkk/dsh-lanthanum`. The plugin is licensed under the MIT License, and it is recommended to review the source code before use.