A client chooses a snapshot's time, so snapshots dated ahead could fill
--keep-last and push the real ones out of a prune. The prune now forgets
snapshots dated more than an hour after now first, and logs their ids. The
VM test forges one and checks the real snapshot stays. The bao-grants case
that read a + path as a glob now names the literal path, and two cases that
pinned 'nothing else' list the archive grants. The ciRunner stanza is back
at its original indent.
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