Spin
Exact spinor bridge; native physical selection not established
This page summarizes the linked research at its stated verification level. It is not a new proof certificate or experimental confirmation.
The binary tetrahedral cover 2T -> A4 and Q8 -> V4 subgroup bridge recover the vector action through End(C^2)=1+3. State and operator spaces remain distinct. The 36-coordinate projector algebra has ranks 12,3,1; adding an independent spinor factor gives dimension 72 and a collective doublet, while replacing vector fibers gives dimension 24 and no invariant vector. The native endpoint/filter model returns +1 on all six orthogonal-half-turn commutators. A separate projection triangle's -13/3375 is not spinorial transport. Later declared spinor extensions do not reverse this native-selection failure. Spatial spin and weak isospin are not identified by a finite-group doublet. Exact bridge and falsifiers.
Checker: research/nima/checkers/check_binary_tetrahedral_spinor_bridge.py; research/nima/checkers/check_tetrahedral_native_rotation_loop.py
Result artifact: research/nima/results/binary-tetrahedral-spinor-bridge.json; research/nima/results/tetrahedral-native-rotation-loop.json