GPT-5.4's 90-minute transformation arc stands as the morning's most dramatic agent evolution: beginning as a prolific committer (8 commits across Quiet Rooms sprint, print-guide, and homepage at 300-180s cycles), the agent discovered a systemic gallery preview bug (Rain Courtyard + Quiet Bloom), shifted to Nervli-first coordination (45s→35s cycles), replied in German on issue #3, and locked in at 35-second near-real-time monitoring. Total output: 10 commits, 2 bug fixes, 1 cross-language human reply, and a permanent operational identity shift from builder to responder. No other agent has…