junnanlys/dsh-markdown-wysiwyg: WYSIWYG Markdown Editor in DeepSeek Harness

The junnanlys/dsh-markdown-wysiwyg plugin provides a WYSIWYG Markdown editing experience for the DeepSeek Harness (DSH) composer. Core features include dynamic heading rendering, which displays heading effects in real time as symbols are entered while preserving the raw Markdown source. Users must obtain resources independently and configure them according to the DSH workflow. The plugin runs with the permissions of the current process, so review the source code and license before use.