dsh-approval-notify: Native Windows Notifications for DeepSeek Harness Privilege Escalation Approval

The `dsh-approval-notify` plugin is designed to address the issue of DeepSeek Harness users missing privilege escalation approval requests while away from the terminal. It leverages native Windows mechanisms to notify users via Toast notifications and system sounds; the notification includes session details and supports clicking through to the approval workflow. Operating in firehose mode, it listens to the `approval/asked` event to ensure that notification failures do not disrupt the approval pipeline, with support for automatic degradation and cross-platform compatibility. Users must install it via the CLI and configure the relevant parameters, making it suitable for developers who need to respond to privilege escalation requests immediately.