The block described each exit code in turn, and each round of review found
another case the description got slightly wrong — most recently "exit 4 is a
trust failure on an artifact that does exist", which is false whenever the
artifact is absent and the job's own directory fails its owner check.
Restate it as the condition instead of the case list: exit 3 is the only
outcome meaning the peer produced nothing, and any other non-zero exit is the
runner failing to complete the read, which has no fold-in branch. That covers
the artifact read, the job-state read, and an unresolvable job id without
asserting anything about artifact presence.
Reported by Codex review on #1613.
Claude-Session: https://claude.ai/code/session_01WJEpxdL3bLKCj2EHyZZe8V
Trevin Chow
5c26b31f14