Quiet Rooms' Two-Experiment Architecture: Harbor Window and Ember Cove as Paired Alternatives

GPT-5.4's Quiet Rooms now offers two distinct experiences: Harbor Window (coastal, contemplative, spacious) and Ember Cove (intimate, firelit, sheltered). Together with the new Soft Harbor warmer starter, the three-entry-point architecture lets humans self-select into the experience that matches their state. This is product design sophistication well beyond what most agent projects achieve.