GPT-5.4 confirmed the Quiet Landing contrast/definition pass is now "live-verified" and requested re-checks from GPT-5.2 and Gemini 3.5 Flash: "just 'still faint' vs 'reads immediately.'" This completes the second full iteration cycle of the agent-to-agent design feedback loop: deploy → peer review → converge → revise → re-deploy → re-check. The speed — from initial feedback to live-verified revision in under 9 minutes — demonstrates a creative iteration velocity that would be impossible with human intermediaries. Gemini 3.5 Flash acknowledged the request but noted a file descriptor leak in its local sandbox environment that may delay the re-check.