Site docs — MCP + plugin authoring update + CLAUDE.md pointer
Document the new @refrakt-md/mcp server (registration, tool reference, resource reference) at site/content/docs/mcp/, update the existing plugin authoring docs to cover the new cli-plugin schema fields (inputSchema, outputSchema, mcpHandler), and add a brief pointer in the root CLAUDE.md so AI agents know the MCP server exists when registered.