CHECKLIST pitfall #6: layer-0 dominance is ResMLP-specific, not universal

Verified by extracting per-layer gamma_dfa from existing ViT-Mini snapshot
JSON (3 seeds, final epoch). On ViT all 4 layers have per-layer cosine
near zero (~0.001 with eps clamp); no layer dominates. Compare to ResMLP
where layer 0 has +0.42 and layers 1-4 are essentially zero.

The pitfall is real on ResMLP but the specific 'layer 0 dominates' framing
doesn't generalize to ViT. Reframed as 'aggregation hides per-layer
structure'; lesson is to always report per-layer values regardless of
which architecture-specific pattern you might be hiding.

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