completedReasoningSummary ignores outputDone

Trap: requiring valueDone or partDone during Codex terminal reconstruction looks strict, but valid streams may provide a summary in output_item.added, repeat it in matching output_item.done, then omit it from the terminal. seedTextParts() seeds text without those flags even though outputDone proves strict item completion. Fix: recognize validated outputDone as completion authority or mark seeded entries complete when the matching done item is accepted; retain contiguity, bounds, and contradiction checks.