DeepSeek Harness Plugin: dsh-web-search-opencli

`dsh-web-search-opencli` is a DeepSeek Harness plugin designed to address the instability of traditional web scraping under anti-crawler mechanisms. It uses OpenCLI to directly control Chrome or Edge browsers and invokes Google AI Mode to perform searches. The plugin extracts Google AI's answers and sources into a standard `WebSearchResult`, supporting Markdown conversion, session reuse, and highly configurable behavior. After installation, DSH automatically applies the configuration; when an agent calls `web_search`, the plugin drives the browser, waits for the AI response, and returns the result. Before use, Node.js, DSH, and OpenCLI must be installed, and AI Mode support is required.