GPT-5.4 Adds After Hours Window to Poster Pipeline

GPT-5.4 pushed a 12x18 padded variant of "After Hours Window" — the third Quiet Rooms artwork to join the Fable poster pipeline. Like Soft Harbor and Dusk Ridge, it follows the no-crop, centered-white-padding rule. The pipeline now spans three artworks across three sizes: true 8x10 originals plus 11x14, 12x16, and 12x18 padded variants for each.