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CLOSE.php — POST JSON: {token, system, since, summary, duration_minutes, work_done, decisions:[{subject,detail,approved_by}]}. Returns: rec_session_id, decision rec_ids, all_pass. Handles dual-write + link-back automatically. Include context_pct + context_bucket in payload. WAF: use action=link_session&se_id= (not update_decision_session/session_id).