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[P1] echidna: ConfidenceLattice.lean E4-Lean half fails lake build (unfold_let removed) #136

@hyperpolymath

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@hyperpolymath

Surfaced reconciling #126. verification/proofs/lean4/ConfidenceLattice.lean (386 LoC) fails lake build with ~49 errors: 30× unfold_let, removed in Lean 4.13.0. Mechanical token-swap to simp only [instLE]/unfold instLE tested → worse (104 errors); fix is non-mechanical. E4's I2 half (TrustLevelSoundness.idr) is constructive and stands; only the L4 half is unverified. This is genuine proof debt the #53/E-series narrative masked.

Sub-issue of #124. PRs Refs hyperpolymath/standards#124. Joint-close on agreement only.

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    majorMajor / load-bearing workrequirements-targetTracked requirements-target item (joint-close)

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