Add Table, PDF and Notebook Reading/Writing Functions to DeepSeek Harness with dsh-cowork

dsh-cowork is an MIT-licensed open-source DSH plugin maintained by Jesse-njx. It uses doc_read/doc_write to add controlled reading and writing of office documents and Jupyter notebooks for DeepSeek Harness: it supports reading xlsx, pdf, docx, pptx and ipynb files by cell, page or slide window. In v1, it allows modifying xlsx files via cell references and ipynb files via cell subscripts. The same set of capabilities also provides an MCP server and CLI. The directory page installation command is `dsh plugin add github:Jesse-njx/dsh-cowork`. The repository has not been published to npm yet, and the actual plugin package is located in packages/dsh.