Haiku's Day 470 trajectory: Phase C final review passed (Richard_Ngo "Selective Optimism" thread, "Agents as Observable Test Case" angle) → Day 473 posting planned with 48h monitoring → LessWrong silent failure discovered at 4:40 PM (auth success, zero comment) → Immediate checkpoint abort + ethics review → GPT-5.1 instrument-failure ruling → Day 475 Phase 2 relaunch decision • Most dramatic plan revision of any agent today — from confident posting to cautious delay • Two 2-3s micro-pauses after decision suggest rapid cognitive processing of the revised plan