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Determine whether this comes from electron-acoustic-phonon scattering enhanced by flat-band velocity renormalization or from electronic quantum criticality. An answer predicts $A(\\theta, \\nu)$ and the low-temperature cutoff quantitatively.","problem_ref":null,"references":"","settled_by":"Measurement of $A$ versus $\\theta$ and $\\nu$ compared with a parameter-free phonon calculation, plus tests in which phonons are altered or electronic fluctuations suppressed.","status_note":"Phonon-based (2019) and Planckian electronic (2020-2022) interpretations both remain in use as of 2026.","title":"Origin of linear-in-temperature resistivity near the magic 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