Add 5 new RPC methods (getHubInfo, listAgents, createAgent, deleteAgent,
updateGateway) mirroring the existing Console HTTP API, enabling pure
WebSocket communication from the frontend.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Document the full RPC flow, message format, error codes, SDK usage,
available methods (getAgentMessages), and guide for adding new methods.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>