dsh-herald: Three-Channel Task Notifications for DeepSeek Harness

dsh-herald is a plugin for DeepSeek Harness (DSH) designed to solve the issue of lost notifications for background tasks when browser tabs are closed. It enables the DSH host process to send notifications directly to the operating system (supporting Windows, macOS, and Linux), delivering them through three channels: in-page overlays, browser banners, and system notifications. The plugin features anti-spam mechanisms, secure encoded transmission, history storage, and a bilingual configuration panel. Installation requires a Node.js environment; after installing it via the command line, a restart is sufficient to use it, ensuring users can receive task status updates in any state.