dsh-brush-pet: Brushing Frequency

`dsh-brush-pet` is a lightweight plugin in the DeepSeek Harness (DSH) ecosystem, maintained by istone. It is a pure Node.js implementation designed to provide network-independent pet care advice for agents, with its primary feature being parameter-based brushing frequency calculation. The plugin registers a tool interface, allowing users to locally invoke the `brush_pet` tool directly to obtain care advice. Installation requires specific dependencies, and the repository owner is uckkk. By removing external API dependencies, it simplifies workflow deployment and maintenance.