//! Realtime delivery (hand-written; user-owned).
//!
//! Stage-3 member: the SSE-session proof ([`session`]) and the shared
//! [`SessionSecret`] the host app installs as a router extension. Stage-4
//! adds the outbox tailer, the broadcast registry, and the stream endpoint.
use Arc;
/// The HMAC secret behind SSE session proofs. Installed ONCE by the host app
/// as a router extension (`Extension(SessionSecret(...))`) on the presence
/// and stream route groups — never per-request, never in a URL.
;
pub use RealtimeRegistry;