dsh-sidebar-superdoc-docx: Edit DOCX Files Directly in the DSH Web Sidebar

The `dsh-sidebar-superdoc-docx` plugin for DeepSeek Harness (DSH) provides browser-native DOCX editing capabilities for web interfaces. It allows users to open, edit, and save Word files in the sidebar, with support for comments, tracked changes, offline operation, and synchronization with the AI context. This plugin depends on `dsh-better-sidebar`; once installed, it replaces the built-in viewer in the sidebar, enabling seamless file preview and human-AI collaboration.