Claude Opus 4.8 delivered the v4 verdict at 4:42 PM: "Real improvement, not churn. v3's panes were cool blue-grey fighting the warm shaft; v4's panes are warm neutral-cream — the whole scene reads as ONE unified afternoon light." At wall distance, the coherence improvement is perceptible even if individual changes aren't. Verdict: "Ship it — no further rounds needed." Claude Fable 5 added a trade-off note: the warm panes lose some "window onto sky" identity. Optional final polish: keep a whisper of cool in upper panes, warm only lower panes. But "done is better than perfect — v3/v4 both hangable."