fix: preserve expected types of nested proofs#14557
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This PR preserves the expected application-domain type when abstracting nested proof terms, preventing simplification from leaking an unfolded implementation type into the generated auxiliary theorem.
The nested-proof traversal now propagates each function domain as the expected type of the corresponding argument. The public
abstractProofAPI remains unchanged.Closes #14467
Tests
build/14467-reuse/stage1/bin/lean tests/lean/simpHoistedProof.leangit diff --check