Struct DispatcherOptions 

pub struct DispatcherOptions {
    pub sink: Box<dyn NotificationSink>,
    pub settings_rx: Receiver<Settings>,
    pub alerts_rx: Receiver<Alert>,
    pub shutdown_rx: Receiver<()>,
}

Dispatcher options for tests + production. Production callers invoke [DispatcherOptions::production] which carries a LibNotifySink; tests construct directly with an InMemorySink.

Fields

sink: Box<dyn NotificationSink>

Box so the dispatcher stays object-safe across InMemorySink (tests) and LibNotifySink (production).

settings_rx: Receiver<Settings>

Live settings snapshot; the dispatcher reads notify_on_complete / notify_on_error from the most-recently-broadcast value on every alert. tokio::sync::watch is the natural fit — exactly one writer (SessionActor::handle_apply_settings) + many readers (each cheap clone).

alerts_rx: Receiver<Alert>

Broadcast subscription. The dispatcher takes ownership; passing it in lets the caller acquire the subscription BEFORE the dispatcher task is spawned (avoids the missed-alert race on session startup — H5 in the plan).

shutdown_rx: Receiver<()>

Shutdown signal: drop the sender or call .send(()) to ask the dispatcher to exit cleanly.