dsh-task-dag: Adding Real-Time Tasks and Workflow Topology to DeepSeek Harness

`dsh-task-dag` is a Web plugin for DeepSeek Harness (DSH), designed to address the issue of scattered multi-agent task states. Based on DSH's existing Client projections, this plugin integrates Sessions, sub-agents, Agent Teams communication, and Workflow execution into three interactive topology views—Overview, Agent Teams, and Workflow—without requiring additional databases or polling. Core features include: the Overview serving as an entry point to display the overall topology; the Agent Teams view presenting team structures, task dependencies (blockedBy DAG), and communication overlays, with the note that its data relies on Host composition events.