Round 4 of #128. @claude-bot-andresmgsl and @codex-bot-andresmgsl again
converged on the same defect, in the round-3 dating expression itself.
`max` over [startedAt, createdAt, completedAt] resolves to completedAt
for a finished run and startedAt for a live one. Those are different
quantities, so the comparison was never an ordering on runs — it was
"newest stamp of any kind". A run cancelled by the concurrency group does
not stop the instant its replacement starts; the runner has to wind down,
so predecessor.completedAt > successor.startedAt is the ordinary case
rather than a corner. On box's aa5a6ba the superseding run started
15:19:38 and the run it cancelled did not finish until 15:19:51 —
thirteen seconds in which the dead predecessor out-dated the live run
that replaced it, and the collapse discarded the wrong one.
That narrowed round 3's two failures without closing them: a CANCELLED
predecessor read FAILURE and a SUCCESS predecessor read SUCCESS, where
both should be PENDING. The second is #136 restored — needs-human over a
tree whose merge button branch protection has disabled.
The list is already in preference order and the select leaves only stamps
the run actually carries, so `first` is exactly "date it by when it
began, falling back only if it never recorded a beginning".
Fixtures 49 -> 51. None of the existing 49 could see this: every one
spaces the predecessor's completion before the successor's start, and
run_() carries no startedAt at all, so the overlap needed explicit
payloads. Both new fixtures fail under `max` and the other 49 do not.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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