DeepSeek Harness (DSH) Plugin: Windows 11 / WinUI 3 Skin (`dsh-winui-skin`)

`dsh-winui-skin` is a Windows 11 / WinUI 3 skin plugin for DeepSeek Harness (DSH). Built on an "everything is a plugin" philosophy, it reads the system accent color from the registry on the Host side, passes it to the Client side via API, overrides the existing design, and injects 133 Fluent-style tokens. It supports Light, Dark, and Follow System modes. The plugin relies on system fonts, uses CSS to simulate the Mica material, and automatically restores the original appearance upon uninstallation. To install it, add it to the current or a specified profile via a script or CLI.