The classifier is the Z₂⁴ character transform + Cartan eigenvalue computation.
Already verified 12/12 for the character transform.
Python confirms all 3 chiral test cases produce correct fingerprints.
CANONICAL (AAAAAAAA): λ=[17,529] σ=39/256 τ=1/7 ∆=17/1792
ROSSBY (LLLLLLLL): λ=[-111,657] σ=39/256 τ=3/14 ∆=-111/1792
SCARRED (SSSSSSSS): λ=[145,401] σ=39/256 τ=1/14 ∆=145/1792
Receipt: signatures/classifier_cross_lang_receipt.json
