Torsion Corrections to the Chandrasekhar Mass from Partially Polarised Electron Matter

White dwarfs are the electron-degenerate counterpart of the neutron-star test: their structure is set by degenerate electrons, so the relevant torsion bound is the electron branch of the Aldred bound, and a polarised fraction of the electron gas — supplied generously by the internal magnetic fields of magnetic white dwarfs — is what couples matter to torsion. This paper computes the torsion correction to the Chandrasekhar limiting mass and inverts the agreement of observed white dwarfs with the standard limit into an exclusion. On the electron branch, rho_A = 2.87e+51 kg per cubic metre, the fractional correction at a central density of 1e11 kg per cubic metre and a polarised fraction of 0.01 is 3.48e-45, falling to 3.48e-47 at 1e09 kg per cubic metre: the limiting mass is unshifted at any meaningful precision. Inverting, white dwarfs that match the standard limit to one part in a thousand exclude electron-branch bound densities below 1.00e+10 kg per cubic metre — a fence forty-one orders below the branch itself, weak as a particle statement (it corresponds to a carrier mass of 9.53e-16 eV per c squared) but a definite, observation-based exclusion of modified torsion models that would place the electron-branch bound at white-dwarf densities. Computed from stated assumptions, not measured.