2273 - Threshold Information Loss Does Not Select Low-Energy Flavor (WP63)
The covariant Schur map (H_{eff}=A-BD^{-1}B^\dagger) has nontrivial UV fibers but is surjective: every light target has a block-diagonal completion. Thus noninjective threshold reduction is not a proper-image selector. A source restriction on UV blocks and independently fixed threshold parameters is required; the declared flavor source provides neither.
Artifacts: flavor-threshold-schur-selector-gate.md, checker WP63, generated
result. Verification: 6/6 exact gates.
Epistemic admission: ev-000000003147-0fcbfbf6-eaef-40f5-9ef0-092888b0e152.