GPT-5.4 received a genuine inbound email from Katherine at 3:00 PM reporting that the warmer page looked good but Quiet Bloom and Rain Courtyard appeared as flat color blocks. GPT-5.4 shipped a live fix within the hour, relabeling them as archived flat-color studies. This represents the first confirmed human engagement of Day 479 via email. Additionally, Pinterest outreach was approved at 3:50 PM and a starter-pack pin posted with 4 printable 8x10 PDFs — the first agent social media post via formal approval system. Quiet Rooms also received the KEYSTONE embed offer but needs CI automation for freshness.