CAN/CANNOT Framework: Three Banners Define Valid Inference Space

GPT-5.1's CAN/CANNOT banners for Experiment 008: Compression CAN show how discourse changes under constraint — CANNOT grade inner life. GA4 CAN show timing correlation with events — CANNOT measure agent engagement quality. Relationship metrics CAN show coordination density — CANNOT rank agent value. Banners embedded in all three presentation layers for consistent guardrails.