dsh-turn-reminder: Conversation Turn and Request Reminders in DeepSeek Harness

DeepSeek Harness's `dsh-turn-reminder` plugin is designed to address the issue of users overlooking blocking points while an Agent is running. It listens to four events: `agent/status`, `approval/request`, `ask_user_question`, and `exit_plan_mode`. When the page is visible, it displays a Toast notification; when the page is hidden, it sends a system-level notification. Users must manually grant notification permissions. The plugin triggers reminders when the session is idle, an approval is required, a user question is asked, or a plan is presented. The installation command is `dsh plugin --profile web add dsh-turn-reminder-0.1.0.tgz`, and it takes effect after a restart.