dsh-hydroponics: Hydroponic Nutrient Solution Mix

DeepSeek Harness (DSH) has released a hydroponics-specific plugin, `dsh-hydroponics`, designed to address nutrient solution formulation issues. Implemented in pure Node.js with no external dependencies, it supports local offline execution. After installing it via a command, users can directly invoke the tool in conversations to perform formulation calculations. The plugin depends on specific peerDependencies and is licensed under the MIT License.