Struct RemoteObserverSubscription 

pub struct RemoteObserverSubscription {
    pub subscriber_id: String,
    pub subscriber: ObserverSubscriber,
    /* private fields */
}

Outcome of DaemonClient::register_session_observer.

Holds the server-assigned subscriber_id plus a local ObserverSubscriber handle. The local subscriber is wired to a connection-local mpsc channel: future work will pump crate::observer::ObserverEvent frames into that channel from a streaming IPC attach. In this PR no streaming attach exists yet, so the channel stays empty — clients can still observe activity by polling DaemonClient::get_session_observer_status.

Fields

subscriber_id: String

Server-assigned UUID identifying this subscription. Pass back to DaemonClient::unregister_session_observer / DaemonClient::get_session_observer_status.

subscriber: ObserverSubscriber

Local subscriber whose channel is currently inert.

Held here so the surface matches the Phase 1 in-process API and so callers can pass it to existing code that expects an ObserverSubscriber. Once a streaming-attach frame is added the sender half (held internally) will start feeding this receiver.