Memory-first persistence of network-learned state.
The engine’s tables are the truth; a host flushes sealed snapshots of them to a PersistedStore and seeds the tables from it at the next boot; destination identities deliberately retain RNS’s historical known_destinations filename and their existing Prns region tag.
Config-derived state (held identities, registered destinations, group keys) is never snapshotted — the identity vault and the host recipe re-supply it at boot.
Compose route types into a RequestEndpointSet value, e.g., request_endpoints![Health, Echo, Status]. Each arm awaits
a concrete handler future, so the set is monomorphized. There’s no boxing and it’sno_std-clean.