dsh-guitar-chord: Guitar Key and Chord Generation Tool

The `dsh-guitar-chord` plugin for DeepSeek Harness (DSH) is implemented in pure Node.js and can run locally without an internet connection. It is designed to assist with guitar practice, with core features including querying guitar keys and chords and generating instrument practice plans. Users can quickly install it using the official command `dsh plugin add github:uckkk/dsh-guitar-chord` and then invoke its tools within a session. The plugin is released under the MIT License, and its source code is hosted on GitHub.