DaemonOutbound: ResolveAttach (daemon → registry request) and RelayAck (target → registry decision). DaemonInbound: ResolveAttachResult wrapping RpcResult<AttachCandidates>, and RelaySetup (registry → target signal). All correlated via reply_to, matching the existing CreateSession pattern. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>