dsh-gpa-calc: GPA Conversion Plugin

A GPA conversion tool plugin for the DeepSeek Harness (DSH) ecosystem, maintained by uckkk. It is implemented in pure Node.js with no network dependencies and provides conversion services by registering a `gpa_calc` tool. Install it with `dsh plugin add github:uckkk/dsh-gpa-calc`. The plugin runs with the current process permissions, supports parameter-based precise calculation, and returns detailed results. It is recommended to review the source code and MIT license before use.