fix(codex): accept a 429 lineage stop Codex confirmed for a descendant

A descendant whose own 429 interrupt went unanswered stays "unconfirmed".
When the root's lineage stop later interrupts it and Codex acknowledges,
the descendant was still published as an errored thread, because only
Stop recorded that acknowledgement. Record it for the lineage stop too,
so a confirmed stop leaves the thread idle.
86084898acHong Liu committed on 10/22/2026, 11:15:29 PMparentbf6a2fa

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