DeepSeek Harness Plugin: dsh-jamaica

`dsh-jamaica` is a Node.js plugin that provides Jamaica-specific country information processing capabilities for DeepSeek Harness (DSH). It is implemented entirely with local native code and has zero network dependencies, making it suitable for offline or restricted environments. The plugin requires specific version dependencies and is loaded at process startup after installation, aiming to provide lightweight localized logic support for the DSH ecosystem.