DeepSeek Harness Plugin: Remote IM Webhooks and Multi-Channel Notifications

The DeepSeek Harness (DSH) plugin `@goodandready/dsh-plugin-notify` is designed to address the issue of easily missed events in multi-session or background runtime scenarios. It provides five notification methods—audio, cross-session popups, native desktop push, IM webhooks, and Web Push (PWA)—covering use cases such as task completion, errors, and pending approvals. The plugin supports flexible configuration, integrates with tools such as Lark and DingTalk, and includes a Do Not Disturb mode. After installation, the relevant features must be enabled via YAML configuration. It requires a Node.js environment, and the Web Push feature requires HTTPS support.