dsh-ai-use: Using AI Tools in DSH

`dsh-ai-use` is a plugin for DeepSeek Harness (DSH) designed to streamline how agents invoke external tools and AI services. It provides tool registration, session invocation, and parameter suggestions, and is automatically loaded after installation without requiring manual configuration. As a pure Node implementation, it has no network dependencies. Developers should review the source code before use to confirm security and licensing.