chore(stack): converge #860 tick repair into #861

[seonghobae]

Converge exact #860 2084d534cef027aacf515a0907e36a3aa600fa62 into #861 without force-push or destructive rebase. Preserve #861's singular-axis delta while adopting the parent comparison-tick accessibility repair and executable contract. This convergence PR carries no independent acceptance evidence; child exact-head checks must regenerate after merge.

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