dsh-hwp: DeepSeek Harness Korean Document Reader Plugin

`dsh-hwp` is a DeepSeek Harness plugin that converts Korean HWP documents to Markdown or plain text. It uses built-in Node.js features to read HWP 5.x and HWPX formats, extracting tables, headings, and other elements, and accesses them via the file system. Once installed, documents can be processed using the `read_hwp` tool. The plugin includes security restrictions (such as file size limits and sandboxing) and configuration options for external converters, but it does not support headers/footers, images, encrypted documents, or the HWP 3.x format.