0a: static Fisher–Rao on Δ₃ proven constant-curvature 1/4, ∇R≡0 (symbolic).
0b: rossbyDriftFromChirality drift-flip metric has signature (2,1), drift
direction time-like at 3 exact rational points.
0c: drift-flipped metric is PROPER — not locally symmetric (108 nonzero
∇R components at centroid, exact), not semisymmetric, not Deszcz-
pseudosymmetric (inconsistent L ratios at two points).
0d: obstruction is carried by the drift direction.
Refutes the semi-symmetry hypothesis for the drift-FLIP geometrization at
m=4; Randers/torsion geometrizations and the m=8 Sidon-block case remain
open (Δ₇ run pending).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
