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Codex round 17. Once a replica has adopted an epoch, a message from an un-flipped instance carries none and is treated as belonging to the current space. It does — unless the sequence counter reset between that publisher assigning its id and publishing it, in which case an id from the dead space lands in a buffer describing the new one. NOT FIXED, because every alternative rule is worse and there is no discriminator. Refusing bare messages once an epoch is adopted would end coverage on every un-flipped publish for the length of the roll, which is a resync storm; delivering without buffering would put holes in the buffer that nothing records. An id from the dead space and an id from an un-flipped publisher are both 'above what we hold' and otherwise identical. What makes it acceptable is a mechanical property rather than an argument, so it is asserted rather than described: the next event from the new space is LOWER than the straggler, which trips the counter-backwards branch, drops the buffers and reports a reset. The exposure is one event wide and it ends loudly. The test also pins the other half — that nothing can detect the straggler ON ARRIVAL — because a reset there would mean the discriminator exists after all and the whole disposition was wrong. Claude-Session: https://claude.ai/code/session_01JVDBKbgn3Xt7ndW1YoYd8X