dsh-task-toast: DeepSeek Harness Status Notification Plugin

dsh-task-toast is a pure client-side plugin for DeepSeek Harness that aims to aggregate scattered Agent statuses in the top-right corner of the page. It supports multiple states, including completed, error, and pending authorization, and provides visual feedback, hover-to-expand details, and system notifications for multi-channel alerts. The plugin requires no build steps and is compatible with browser and DSH Desktop environments, helping developers or users monitor Agent runtime status in real time.