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Pad-model extension assumed OPM-style "Z+" for the positive-Z exterior face, but ResInsight emits "Z" (OPM-Flow short form). The K1/K2 shift never fired, leaving the bottom boundary face at the original NZ instead of the new padded NZ. Match both "Z" and "Z+" so the extension applies. Adds a regression test verifying that with BCCON_BCPROP and padding the "Z" exterior face is shifted by nzUpper + nzLower while the "Z-" face remains at K=1, and documents the exterior-face semantics of the direction mapping.