Unified web search + content extraction extension for pi with 19 backends (DuckDuckGo, Jina AI, Tavily, Brave, Brave LLM, Exa, Exa MCP, OpenAI Codex, Serper, Firecrawl [keyless], fastCRW, Marginalia, LangSearch, Linkup, Perplexity Sonar, SearXNG, WebSearc