e.g. ["patterns@0.6.0", "ml@v1"] — every distinct version combination seen.
scanIds of every exception-decision record, for quick review.
sha256 over the records in order — any edit to any record changes this.
True if any record in the package has includeEvidence-populated raw evidence.
Aggregates many AuditRecords into a single tamper-evident summary for a reporting period — built by buildEvidencePackage, checked by verifyEvidencePackage. See #75 / the marywang-aiops design comment on #24 for the three-layer model this implements (event record / evidence package / control claim).