add documentation

docs-site/docs/reference/lsp.md

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+# LSP integration
+
+**Primary paths:** `src/services/lsp/`, `src/tools/LSPTool/`
+
+`LSPServerManager.ts`, `LSPClient.ts`, and related modules manage language server processes and diagnostics. The agent invokes LSP capabilities through `LSPTool`, which bridges model tool calls to LSP requests.
+
+Passive feedback and config live alongside the manager (`passiveFeedback.ts`, `config.ts`).
+
+**See also:** [Tools reference](https://code.claude.com/docs/en/tools-reference) (LSP tool), [Architecture](../architecture.md).