Compare median post-error intra-command IATs against baseline
(commands not immediately following an errored command):
* ratio ≥ STRESS_EUSTRESS_RATIO_MIN (1.20) → eustress_positive
* ratio ≤ 1/STRESS_DISTRESS_RATIO_MIN → distress_negative
* otherwise → none
Confidence hard-capped at 0.5; 0.30 below
STRESS_MIN_ERRORED_WITH_IATS (2).
anti
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