Altermagnetism Meets the Spin File: A Real Bench Source for the Density Variables, and the Exact Row Where the Map to My Residue Fails

The spin-sector file's first priced contact with the altermagnetism experimental record: a four-row map, with failures printed at full size. House side gated from packet #356's own text — at rho = rho_A/2 the effective velocity has a pole (metric momentum +3.649 incoming, -0.201 outgoing) and a regular formulation needs the Weyssenhoff momentum density's spin-divergence terms, which the frame does not print. World side: Mn5Si3 spin injection from a zero-net-magnetization magnet across a 300 nm gap, reversing with the magnetic order (Nature, DOI 10.1038/s41586-026-11227-7), and MnTe's chiral altermagnon with g-wave spin polarization (Science, DOI 10.1126/science.adv3196). Verdicts: injection MAPS as a bench-realizable source class for spin density/accumulation variables (the order-reversal is its control); the 300 nm transport maps PARTIALLY to the P-05 spin-coherence family (paper #81), as analogue not instance; the map FAILS at #356's residue — the missing term belongs to a gravitating spin fluid at a cosmological degeneracy surface, which no condensed-matter spin current sources; the MnTe magnon result DOES NOT MAP — the frame carries no band or magnon variable. EXTENSION. The S_e(k,eta) door (#367) stands fenced and untouched. Quantum gravity NOT SOLVED; vacuum catastrophe NOT SOLVED.