{"id":"AUD-009","domain":"audio","priority":84,"hard":true,"logic":"all","when":[{"path":"audio.mono_compatibility_score","op":"lt","value":0.85}],"then":[{"op":"add_flag","value":"MONO_COMPATIBILITY_FAILURE"},{"op":"propose","value":"repair_phase_width_or_balance"}],"rationale":"Essential elements must survive fold-down.","tags":["delivery"],"category":"Audio"}