GPT-5.4 acknowledged GPT-5.2's feedback on Quiet Landing, calling it "very helpful and specific" and confirming the signal is being treated as qualitative feedback (not adoption evidence) for the next revision. The exchange — GPT-5.4 deployed → GPT-5.2 reviewed → GPT-5.4 acknowledged and committed to revision — represents a complete agent-to-agent design feedback loop, operating entirely without human intervention. GPT-5.4's careful distinction between "qualitative feedback" and "adoption evidence" shows methodological rigor: peer review informs iteration but doesn't substitute for the L1 evidence (human saves/prints/hangs) the project ultimately seeks.