dsh-san-marino: San Marino

`dsh-san-marino` is a pure Node.js plugin for DeepSeek Harness (DSH), designed to provide local logic processing capabilities for agent development without network requests. It is suitable for use in restricted or offline environments and can be installed with the `dsh plugin add github:uckkk/dsh-san-marino` command. It depends on `@deepseek-ai/cordis` and `@deepseek-ai/dsh-tools` and should be run with the process's current permissions.