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@@ -266,6 +266,12 @@ rho = 0.51--0.57. Identifiable, not efficiently recoverable, exactly as
observed. (Our fields are structured rather than Wigner, so the theory
guides rather than proves.)
+*Added 2026-08-01: that parenthesis was the whole story and we left it
+as a parenthesis. Structured means low-rank, and the threshold formula
+assumes full-rank noise, which is why the 0.9 figure later turned out to
+predict nothing — see `RANK_RESULTS.md`. The caveat was correctly
+identified and not followed up for months.*
+
**Correlation and identifiability are different axes.** The colour
channel alone reaches rho = 0.863, far above the mixed descriptor, but
its scenes collide: only 126 distinct colour multisets among 256 scenes,