dsh-decor-palette: Soft Decoration Color Palette

`dsh-decor-palette` is a plugin in the DeepSeek Harness (DSH) ecosystem, maintained by uckkk, and focuses on soft-furnishing color palettes. It does not rely on model-generated text; instead, it provides explicit color-scheme recommendations through parameter calculations. It is fully offline and has no network dependencies. Before use, it requires the `@deepseek-ai/cordis` and `@deepseek-ai/dsh-tools` dependencies. After installing it with the `dsh plugin add` command, you can invoke the `decor_palette` tool in a session.