A post-baseline quantum-mechanical operator-translation model with a six-coordinate Schrödinger equation, three Pauli-realizable imaginary generators, and a bounded Pauli-channel residual

The muon anomalous magnetic moment a_mu = (g_mu - 2)/2 is now constrained by a highly precise experimental anchor, while the theoretical interpretation depends strongly on the chosen Standard Model baseline, especially the hadronic vacuum polarization (HVP) contribution. This v6 preprint treats the proposed internal-phase contribution as a strictly post-baseline operator slot. After selecting a named Standard Model baseline (including current 2025 HVP updates), any remaining residual may be represented by a bounded Pauli-channel coefficient a_int. The model is built from standard quantum-mechanical and QED postulates and uses three internal imaginary generators I_1, I_2, I_3 represented by Pauli matrices. A six-coordinate Schrödinger-type equation projects to the usual de Broglie wave and to a bounded Pauli correction in the observable spin-precession channel. The only parameter-free internal numerical input is the electron-referenced mass comparator M_mu/e ≈ 206.7682828595, kept separate from the g-2 analysis. The model does not resolve the current HVP tension nor replace QED calculations; it supplies a controlled operator slot for quantitative testing after baseline selection.