JSON FORMAT — family 'cls'
Return only a valid JSON object (no code fences, no comments) with exactly this structure. Example with 1 record:
{"header":{"d":"20260603","l":"en","model":"cls-support-2026","k":6},"messages":[{"id":"m1","text":"The quiz froze after question 4, is that a known issue?","labels":["question","feedback","bug","request","praise","other"],"selected":[0,2],"conf":0.91,"rationale":"reports a malfunction and asks"}]}
