Introducing the DeepSeek Harness Plugin: dsh-perm-gate

`dsh-perm-gate` is the permission gate plugin for DeepSeek Harness, combining approval, classification, and gating into a single package. It uses a fixed priority chain and a fail-closed mechanism to ensure that high-risk operations cannot be bypassed. Core features include command blacklists, session authorization, LLM-based risk-tier adjudication, and adjudication learning. The plugin supports a pure-function rule engine, an audit log stream, and an automatic review mode, resolving cross-plugin version coupling issues while providing a unified audit trail and fine-grained control.