dsh-notify-on-complete: Adding Desktop Notifications to DeepSeek Harness

pitetow/dsh-notify-on-complete is an extension plugin designed specifically for DeepSeek Harness (DSH), aimed at solving the problem of users having to frequently check the terminal or wait for approvals during long-running tasks. This plugin sends low-disturbance desktop notifications to remind users when tasks end (distinguishing between completion, errors, interruptions, or token limits), when model calls prompt for input, or when waiting for sandbox and tool permission approvals. Core features include filtering sub-agent sessions to reduce redundant notifications, providing fine-grained configuration for different scenarios such as prompts and approvals, and supporting cross-platform system notifications and alert sounds across macOS, Linux, and Windows. The plugin has zero runtime dependencies and leverages Node.js child processes to ensure notification delivery is unaffected by the main process exiting. Installation requires Node.js 22 and pn