dsh-bar2psi: Bar to PSI Conversion Plugin

The DeepSeek Harness (DSH) plugin `dsh-bar2psi` is a lightweight tool for converting the data format from Bar to PSI. Implemented in Node.js, it has no network dependencies and is safe and reliable at runtime. Before installation, ensure the environment meets the version requirements for `@deepseek-ai/cordis` and `@deepseek-ai/dsh-tools`, and review the source code logic and license.