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A switching or rejoining node replays late writes as fresh changes
naming each write's user, and nothing judged them before they left: a
replay every node would refuse (a revoked capability, a second
envelope at a signed path, readers changed) was refused everywhere,
and with it everything the node wrote after it.
Under a policy, replay_newest now judges each group it commits as
every node will (rules::judge_held, in the new epoch); one they would
refuse is taken back (forked at the heads before it, same actor) and
its paths quarantined with the reason. replay_newest takes the epoch.
Review finding 3 (remake replays).
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