dsh-workspace-monitor: A Command-Driven DSH Workspace Monitoring Plugin

`dsh-workspace-monitor` is a lightweight command-line plugin for DeepSeek Harness (DSH), designed to replace manual polling and provide efficient workspace file status monitoring. It supports creating and managing multiple independent monitoring tasks through natural language commands, with each task having its own configuration and state. By default, the plugin scans once every 60 seconds, reads only file metadata, ignores specified directories, and outputs detailed change summary reports. Tasks are tied to a session ID and feature fault tolerance and retry mechanisms, making it suitable for developers who need to track file changes continuously.