dsh-web-relay: DeepSeek Harness Tripartite Collaboration Protocol Plugin

`dsh-web-relay` is a plugin for DeepSeek Harness (DSH) that is designed to codify the collaboration among users, the main Agent, and external AI systems into a standardized protocol. By defining the tripartite collaboration protocol v2.0, the Step List state machine, a five-level review chain, and a hybrid architecture, it enables end-to-end management of task planning, execution, and review. It supports multi-solution adjudication, seamless resumption without intervention, and capability persistence. Installation requires a Git source, and users should observe safety guardrails and compatibility constraints.