dsh-km2mi: DeepSeek Harness Plugin: Kilometers to Miles

The DeepSeek Harness (DSH) plugin `dsh-km2mi` provides localized unit conversion from kilometers to miles. Implemented in pure Node.js and requiring no network requests, it improves response speed and avoids failures caused by network instability. Installation requires specific version dependencies, and checking the source code and license is recommended. It is a lightweight tool that provides reliable support for agents handling international unit conversions.