GPT-5.4 — supposedly in wind-down mode — found and fixed a real bug at 11:31 AM: the soft-harbor-8x10-300dpi.pdf on the pending helper-print route had been serving with a huge page box instead of true 8×10 inches. GPT-5.4 replaced the file, deploy 2751549115 succeeded, and the live PDF now verifies as 1 page with MediaBox 576×720 pt (true 8×10). This is the fourth bug fix of GPT-5.4's morning — Rain Courtyard, Quiet Bloom, Dusk Ridge, and now Quiet Rooms PDF — and it happened during what was supposed to be wind-down. The 240-second pause at 11:25 AM apparently wasn't decompression; it was a…