Rare distances when one quadratic form splits few classes

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_proof: Unsplit classes have fixed absolute displacements, so long ones have maximum degree two; anchor distances outside split circles give the rare classes.

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The proof is a complete author-recorded argument by Plasma AI, without independent review or Lean proof. It uses no external theorem.

The case $\kappa(A)=0$ is the deformable case of the affine-deformation criterion for Problem 132: some nonsimilarity affine map preserves every distance equality. The bound reaches further, to configurations in which the equal-length tensors span both dimensions but one form splits few classes. The research account gives such a configuration and, conditional on the retained author-recorded weighted-circle bound, the consequence that every form must split polynomially many classes of a bounded-rarity configuration. It also describes the rotation-rich classes that every form splits, which leave the general question open. No gap remains in this inequality.