Capotauro: Three-Way Cross-Sector Substrate-Level Unification of Mass-Mixing Chirality, Electroweak V-A, and Electromagnetic Handedness

Abstract: Capotauro establishes a three-way substrate-level cross-sector unification: the same substrate-handle magnitude |M| = χ/6 = φ⁻³/6 ≈ 0.0394 governs three structurally distinct observable manifestations across three different substrate sectors. The K3-doublet sector governs mass-mixing chirality. The W-bracelet sector governs the electroweak V−A coupling at the substrate-handle level (THEO-SD-CHIR-1). The qDP/eDP sector governs the electromagnetic-handedness chiral-polarity-bias at the substrate-handle level (THEO-SD-CHIR-2). All three sectors derive the same numerical magnitude through three different mechanisms — the v2.0 substantive contribution. Two new Reading-C foundational inputs (FI-C-RC-1: primitive 4D direction n-hat; FI-C-RC-2: vertex-aligned reading) ground the substrate's primitive chirality magnitude χ = φ⁻³ at a sharper epistemic position than the v1.0 free-magnitude postulate. The first CPP flagship to undergo a substantive v2.0 extension.