dsh-pressure-cooker: Return Small Kitchen Appliance Usage Plans Based on Parameters

`dsh-pressure-cooker` is a DeepSeek Harness (DSH) plugin that returns usage recommendations for small kitchen appliances based on parameters. It is implemented in pure Node.js, has no network dependencies, and depends on `@deepseek-ai/cordis` and `@deepseek-ai/dsh-tools`. Users can install it with `dsh plugin add github:uckkk/dsh-pressure-cooker`, after which they can call the `pressure_cooker` tool in a session to get usage guidelines.