wwumit/dsh-office: Office Productivity Skills Hub

`wwumit/dsh-office` is an office skills plugin for DeepSeek Harness, designed to address the issue of fragmented skill management through a remote registry. It provides two skills that run purely locally: Excel data analysis and converting meeting notes into PPT slides, ensuring that data never leaves the machine. To install it, Cordis is required; it can be enabled by installing via npm and registering it in the entry file. The plugin focuses on office automation, with a focus on data security and open source.