/**
 * ArchiveBackend — pluggable archival contract. See session-hierarchy.md
 * §12.3 Retention and Archival.
 *
 * Convention #10 (Provider abstraction): interface lives here; concrete
 * implementations (disk, s3, glacier, …) live in sibling files. Phase 8 ships
 * the reference disk impl (`disk-backend.ts`); production deployments plug
 * their own over the same surface.
 *
 * Convention #9 (Registry + Manager + Store): {@link ArchivalManager} is the
 * Manager; this `ArchiveBackend` is the Provider slot it drives; the live
 * `SessionStore` is the Store it mutates.
 */
export {};
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