//! Module: registry
//!
//! Responsibility: define host-observed registry entries for backup planning.
//! Does not own: registry querying, manifest projection, or stable storage.
//! Boundary: data shape consumed by backup discovery and plan construction.
///
/// RegistryEntry
///
/// Host-observed canister registry row used as backup discovery input.
/// Owned by backup registry support and consumed by discovery and planning.
///