Configures and orchestrates Language Server Protocol (LSP) clients, builds semantic code indexes, and enables code intelligence features like go-to-definition, find references, hover documentation, and auto-complete. Use when you need to set up or debug language servers (e.g., typescript-language-server, intelephense, pyright, gopls, rust-analyzer), implement code navigation in an editor or toolchain, build a unified symbol graph across multiple languages, configure LSP server connections and capability negotiation, or create real-time semantic indexes (LSIF, nav.index.jsonl) for large codebases.