SerialkompatHistory

The serialkompat { history { … } } block: the append-only published-schema history used for the transitive, persisted-data-horizon check (design §5).

The dir is a source-controlled location the consumer commits — each release records an immutable <version>.snapshot there via serialkompatRecord, and serialkompatCheckHistory verifies the current schema against all of them.

The retention bounds (sinceVersion, depth, maxAge) declare how far back that guarantee reaches. Unset ⇒ the whole history is checked. Setting more than one is most-permissive — the union of what each keeps, so a second bound never silently narrows coverage (design §13, issue #121).