dsh-book-pick: Book Selection Methods

The DeepSeek Harness plugin `dsh-book-pick`, maintained by uckkk, is a pure local plugin implemented in Node.js that intelligently selects books based on parameters. It requires the dependencies `@deepseek-ai/cordis` ^4.0.1 and `@deepseek-ai/dsh-tools` before installation. Its core feature is the `book_pick` tool, which returns book recommendations based on input parameters. After installation, it can be invoked directly in a conversation. The code is open source; it is recommended to review the source code and license before use.