fix: rely on hasher type inference in proof serialization #1429
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Problem: serialize_proof_to_file was instantiated with Blake2sMerkleChannel, but the function is generic over the Merkle hasher (H: MerkleHasher), not the channel. This mismatch is inconsistent with the function signature and the rest of the codebase, and can cause type errors.
Solution: Removed the explicit generic parameter and let the compiler infer H from &CairoProof. This avoids confusion between channel and hasher types and aligns with established usage patterns in the repository.
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