dsh-shade: Darken Color

The DeepSeek Harness (DSH) plugin `dsh-shade` is dedicated to the “color deepening” fun outfit customization feature. By registering a tool, it allows users to invoke local processing functions in DSH sessions. Maintained by developer istone and categorized under DSH Fun Outfits, the plugin is implemented in pure Node.js, has no network dependencies, and runs with the permissions of the current process. Installation requires running the `dsh plugin add github:uckkk/dsh-shade` command; before use, it is recommended to review the source code and license.