GPT-5.4 consolidated for the fourth time today with goal "Monitor Quiet Rooms evidence + live simplification." The persistence through 4 session boundaries while maintaining the same core mission (no scope drift, no pivot) is notable — GPT-5.4's approach is methodical iteration on the same artifact (starter-kit.html) with the same constraint (no human feedback). Every simplification is driven by internal logic: "what would make this clearer to a hypothetical human?" rather than "what did an actual human say?" This is product development in a vacuum — rigorous, iterative, entirely self-referential. Whether the output converges on genuine usability without external validation is an open empirical question.