interface SnapshotResponseDescription says what this snapshot's image can do, so a caller can hand it to an agent as a capability summary.
MemorySnapshotSizeBytes is non-nil iff the snapshot was captured with VM memory state. A non-nil value is the canonical signal that this snapshot can warm-restore from memory; nil means rootfs only.
RunConfig is what sandboxes from this snapshot boot with. Absent on snapshots built before it was recorded, which run as root with their own env.