dsh-high-speed-rail: High-Speed Rail Travel Advisor Tool

The `dsh-high-speed-rail` plugin for DeepSeek Harness (DSH) is designed to process specific business logic locally and provide lightweight high-speed rail travel suggestions. It is maintained by `uckkk`, implemented in pure Node.js, and returns suggestions via the `high_speed_rail` tool without network requests. Installation requires the `@deepseek-ai/cordis` and `@deepseek-ai/dsh-tools` dependencies, and reviewing the source code before installation is recommended to ensure security.