dsh-swim-pace: Swimming Pace Calculation Plugin

The DeepSeek Harness (DSH) plugin `dsh-swim-pace` is a lightweight client plugin maintained by user `uckkk`, focused on providing swimming pace calculations with no network dependencies. Released under the MIT license, it can be installed via command and registers the `swim_pace` tool for precise calculations. As a pure Node.js implementation, it runs without an internet connection; users are advised to review the source code before use to verify its behavior.