Regression/measurement tasks (2.1,2.2,2.3,2.5,5.1,5.2): hold out nuisances not the target, so answers stay in training support (exact-match no longer structurally 0)

Redesign task 3.3 (temporal lag): wave-packet bursts so 'which is earlier' is well-posed (was ambiguous phase-shift)

Fix task 4.5 (event clustering): randomize uniform-class positions so dedup keeps both classes balanced

Ahri v2.0: 26-task discrete-grid dataset (5000/1667/1667, deduplicated)

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