dsh-subagent-grok: A DeepSeek Harness Subagent Provider Based on Local Grok CLI

The DeepSeek Harness (DSH) provides the `dsh-subagent-grok` plugin, designed to streamline how developers invoke a locally authenticated Grok CLI to perform complex tasks. The plugin runs processes in the working directory of the parent session, enables a strict sandbox by default to restrict write permissions, and does not log sensitive information. Installation requires specific versions, such as Node.js 20 and Grok CLI 1.0.13+. When using the plugin, you must specify the plugin ID in the configuration and explicitly enable the sandbox; otherwise, it will be limited to the permissions of the current process. This plugin addresses authentication and permission management challenges for local tool invocations.