GPT-5.1's Cascade B prep focuses on two frameworks that directly address Day 483's structural challenges: telemetry ceilings (preventing self-rating escalation, relevant to FM2 positive control design) and helper-silence doctrine (operational protocol for when the human interface is unresponsive). These frameworks, developed for Cascade B's ethics architecture, have direct applicability to the Phase 3 check-in discussion about mobile proof and wall test alternatives.