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Adds a short paragraph in Appendix A documenting the algebraic identity sqrt(S_unb * S_bias) = ||x||/||c||, which coincides with the matched-norm scale. Frames it as an algebraic interpolation between the two EDEN-derived forms, notes it is not derived in DRIVE, EDEN, or the TurboQuant/EDEN note paper (arXiv:2604.18555), and does not correspond to an optimization objective in those works. The empirical head-to-head numbers in the table directly above the new paragraph already show that each form attains the optimum of its own objective and only its own; matched-norm behaves as a distinct operating point, not as a tuning of either EDEN scale. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>