dsh-ux-writing: UX Writing Guide

The `dsh-ux-writing` DeepSeek Harness (DSH) plugin is designed to help users generate standards-compliant UX copy. Based on the "everything is a plugin" design philosophy, it was developed by maintainer uckkk and is licensed under the MIT License. Installation requires command-line operations and configuration in the profile's `package.json`. The plugin is implemented purely in Node.js and has no external service dependencies; it requires installing `@deepseek-ai/cordis` and `@deepseek-ai/dsh-tools`. Once installed, users can invoke its registered tools during a session.