dsh-purifier: Water Purifier Shopping Plugin

dsh-purifier is a water purifier selection plugin designed specifically for DeepSeek Harness. It is implemented purely in Node, with no network dependencies, and its core functionality is to accurately recommend kitchen appliances based on user-provided parameters. The plugin is released under the MIT license, supports installation via command, and registers a tool named `purifier`. Developers can integrate it into agents to address limitations of general-purpose large models in hardware decision-making, but it should be run in a trusted environment.