Any added model's answer is now checked, not just the layer combos; a blocked answer falls to Katman-1, then 2, 3, 4. A selected layer only tries the ones after it; Katman-4 is delivered unasked. Layer fallbacks always open through the AITURK gateway, which hosts the combos, whatever route the model used. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>