- New public guide (guides/external-backups): the sparse-mmap reality
for external backup tooling — why a brain directory can show 100+ GB
apparent size on a small disk, which files are sparse, tar czSf /
rsync --sparse / cp --sparse=always, live-store caveats, and what
persist()/restore() already handle natively.
- New public concept (concepts/generation-fact-log): what facts are
(after-image commit records, body-less tombstones), the crash-safety
model (checksummed frames, reconcile-to-committed, absent = never
committed), the scanFacts()/factSegmentPaths() surfaces with the
telemetry shape, family stamps + open-time coherence, and the
storage capability seam for plugin authors.
- Cross-link from the snapshots guide; sparse notes added to the
public persist()/restore() JSDoc (the operator-facing sites).
