Audit note. This paper predates the framework's methodology audit of 2026-05-30. The hadron-topology / meson--lepton homomorphism content is structural (Boolean algebra on codeword XOR) and is unaffected by the audit's headline retractions. The Bₛ / Bc R1-anomaly framing is qualitative and survives at structural level. Readers should consult ANCHOR §15 (esp. items 135 III (b), 142) for the wider audit context affecting the framework's quantitative claims; this paper's content is class-3 discrete-identity / structural and survives without scope-limiting. We evaluate mesons as topological XOR composites. Colour bits cancel identically, mapping the pseudoscalar meson nonet into the lepton subspace. The pi+ evaluates to the null codeword (pseudo-Goldstone boson). The Bs and Bc mesons violate the R1 constraint, explaining extreme B0 mixing frequencies. 2026-06-20 legacy erratum: This version adds a canon erratum note to the legacy paper. Hadron topology mostly held; update spectroscopy audit The body is preserved as a historical derivation trail; the erratum note identifies the current ANCHOR/DRIFT status and superseded claims. 2026-06-21 canon refresh: This version incorporates the 2026-06-21 ANCHOR/DRIFT/PTMS canon refresh and rebuilt local PDF.
D. G. Elliman (Sun,) studied this question.