dsh-markdown-xyy: DeepSeek Harness Conversation Markdown Theming and Version Ledger

dsh-markdown-xyy is a plugin that runs on DeepSeek Harness and implements theming for Markdown conversations using pure CSS. It provides four built-in themes with persistent synchronization and supports customization through AI-assisted or manual CSS editing, including incremental layout overrides for specific elements. The plugin features an immutable version ledger, a real-time theme editor, and persistent installation capability, aiming to optimize the reading experience for large volumes of conversations; it is licensed under the MIT License.