dsh-formalin: Formaldehyde Treatment Tool

The DSH (DeepSeek Harness) plugin `dsh-formalin` aims to provide agents with domain-specific tools for formaldehyde remediation. Developed in Node.js, it has no runtime network dependencies and can generate residential air quality plans based on input parameters. It requires installing specific library dependencies before use and is currently classified as an online tool. The plugin provides DSH sessions with localized plan generation capabilities.