ReadonlycapabilitiesEvery capability, active or not, at snapshot time.
ReadonlysnapshotBumped only on a breaking change to this snapshot's own shape. Bumped 1 -> 2 by OUT-01: every capability key (file#exportName) is now built from a root-relative file, so a v1 snapshot's keys can never match a v2 run's.
A persisted, JSON-serializable snapshot of the inventory at one point in time -- see
buildManifestSnapshot.