Install a Safety Calculator for DeepSeek Harness with dsh-tool-calculator

### 翻译结果： The dsh-tool-calculator is a DeepSeek Harness community plugin maintained by omdsh-dev. It uses a zero-dependency recursive descent parser to evaluate mathematical expressions within the process, without relying on `eval` or spawning bash processes. This article checks the installation commands, whitelisted functions, security boundaries and adaptation instructions for version 0.1.0-rc.6 against the directory page and the GitHub repository.