dsh-search-first: A DSH Plugin That Enforces Searching Before Answering

The DeepSeek Harness (DSH) plugin `dsh-search-first` follows the principle of “Search first, verify facts, reply last.” By enforcing multi-source search and fact-checking before generating a response, it addresses issues of large-model hallucinations and outdated information. The plugin supports custom query models, multi-source ranking, citation-format guidance, and full-pipeline caching. It requires Node.js and the mounting of a DSH web profile. Users can enable it by configuring API keys and switches, making it suitable for agent development tasks that require real-time and accurate information.