feat: add compatibility wrappers for core modules

This commit adds compatibility wrappers for Echo, EchoCharacteristic, and EchoResidue to prevent breaking external dependencies.

Author: hyperpolymath

proofs/agda/Echo.agda

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+{-# OPTIONS --safe --without-K #-}
+
+module Echo where
+
+open import Echo.Core public

proofs/agda/EchoCharacteristic.agda

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+{-# OPTIONS --safe --without-K #-}
+
+module EchoCharacteristic where
+
+open import Echo.Characteristic public

proofs/agda/EchoResidue.agda

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+{-# OPTIONS --safe --without-K #-}
+
+module EchoResidue where
+
+open import Echo.Residue public