materialize requires an old-snapshot row to be classified superseded, and its verdict kept every
superseded row open, so rerunning the probe (what its own error tells the model to do) could never
reach pass; late-input reran 3 and 9 on the new snapshot and still got inconclusive. A superseded
row now closes only when a non-superseded row with the same captured argv observed the current
snapshot. Re-materializing an already-published evidence.json names the cause instead of failing
generically.