Sign-First Unification in Magnetic Readout: Certified Streets Across Chiral, Altermagnetic, Anti-, And Ferro-Magnets Under a Shared P-Lane Contract

This manuscript is a unification of the magnet stack into a single corridor contract language where signed-triad fingerprints, fixed-lane certification, falsifier-first runs, and 4S3/leave-one-out closure are treated as one operational system rather than a set of optional add-ons; the work’s value is that it turns “directional / street” magnet claims into replayable, tokens-first certificates that survive declared swaps and cannot be rescued by hidden threshold travel or story drift, providing a common grammar that later platform-specific notes can inherit without re-litigating definitions.