An agent can finish a useful edit and crash while explaining it. It can also write half an edit and leave behind a confident-looking paragraph from before the failure.
Treating the turn as absent loses work. Treating the partial stream as final invents certainty.
SkyeEngine Code keeps the crashed state, the last visible output, the packet which initiated the turn and a warning that partial artifacts may exist. The operator or replacement agent can inspect the working tree and decide what survives.
Recovery is therefore an evidence problem before it is a restart problem.