DL-073

DeliverControl (and channel-borne SteerControl) carry the full first-party compass.v1.Message and nothing else (no channel_seq); the agent acks per message via AgentFrame.delivery_ack { message_id } — the frozen ack shape

Status: Active (Matt, 2026-07-29)

Record: ../../server/compass-notification-delivery/design.md#d3–delivercontrol-payload-the-first-party-compassv1message-the-ack-is-the-message-id