dsh-musictheory: A Mathematical Toolbox for Music Theory with DeepSeek Harness

`dsh-musictheory` is a deterministic music theory toolkit for DeepSeek Harness, designed to address non-deterministic errors in musical calculations. This plugin has zero runtime dependencies, is based on pure 12-TET arithmetic, and supports core features such as note-name parsing, frequency/MIDI conversion, chord and scale construction, interval recognition, transposition, and chord identification. Its features include configurable standard pitch, input validation, and strict adherence to spelling rules. As a plugin in the DSH ecosystem, it provides agents with precise and reliable mathematical computation support.