Generates structure
The carrier decoder Y is the determinant-normalized two-point generator on the derived split E = E_- ⊕ E_+. The ranks are forced by the compact Higgs index (dim E_+ = 2) and primitive Yukawa type (dim E_- = 3). The carrier polynomial 6Y² − Y − 1 = 0 is then the minimal polynomial of the two derived roots — a corollary, not an entry assumption.