Conversation signals — statistics on the AI layer
Each contact's AI summary, sentiment, and call reason become features at the interval grain. The same baselines, z-scores, and persistence rules apply. Taxonomy v1 · labeler v2 · weekly 2% audit, agreement 0.91 (threshold 0.85)
AHT this week: did the work change, or the handling?
Claims queue, this week vs the 4-week same-weekday baseline · shift-share on AI call-reason labels · mix effect + rate effect = total, no residual (Findings spec B4)