dsh-humidity: Humidity Reference Tool

`dsh-humidity` is a DeepSeek Harness plugin maintained by uckkk that provides humidity reference recommendations using pure Node.js. The plugin has no external network dependencies and returns explicit humidity-handling recommendations through parameters. The installation command is `dsh plugin add github:uckkk/dsh-humidity`. It depends on `@deepseek-ai/cordis` (^4.0.1) and `@deepseek-ai/dsh-tools` (>=0.1.0-rc.6), and is suitable for environmental control or health-related applications.