Each audio has six multiple-choice rows: action, device type, device/scene
name, location, target value, and attribute. Slot 1 uses A–I; slots 2–6 use
A–G. Options are shuffled deterministically per audio and slot.
acceptance_rejection is assigned per slot row. acceptance means the label
supports a clearly extracted value for that slot. rejection means the slot
is not mentioned, the speech is unclear, or there is no human speech. This
export covers labeled L1 and speech-present L6 audio. The invalid_noise
collection is excluded from this scope.