dsh-plugin-hello: A Minimal Tool Plugin Example for DeepSeek Harness

The `dsh-plugin-hello` plugin for DeepSeek Harness (DSH) is a minimal community plugin example designed to demonstrate how to register callable tools with the model through a plugin. Its core function is to accept a required `name` parameter and return a formatted greeting, and developers can customize the greeting prefix by modifying the configuration file. During installation, the official command must be used to link the plugin to a profile, and pnpm version compatibility must be ensured. This plugin serves as a good starting reference, helping developers quickly validate tool registration logic and understand DSH's plugin development conventions.