dsh-tab-watchdog: DeepSeek Harness Web Browser Tab State Monitoring Plugin

`dsh-tab-watchdog` is a persistent plugin for DeepSeek Harness Web that reduces the need to constantly switch tabs to check status. Its core features include displaying pending counts in the tab title and icon, and flashing green or yellow when work completes, errors occur, or approval is required. Install it with `npx @deepseek-ai/dsh@latest plugin --profile web add ./dsh-tab-watchdog`. The plugin is implemented with a dual-half structure, supporting alternating favicon hints and persistent operation after browser refreshes. Note that the error state remains frozen and no settings interface is provided.