dsh-csv-to-md: A CSV-to-Markdown Table Plugin

The DSH Harness (DSH) plugin `dsh-csv-to-md` is designed for agent development to convert CSV data into Markdown tables for display and processing. It is maintained by uckkk, implemented in pure Node.js, and can run locally without an internet connection. After installation, users need to enable it in `package.json` and directly invoke its tools in a session. Since it involves third-party code, please review the source code before use.