mpt: enforce embedded subnode RLP size < 32 in branch/extension validation #1498
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Enforces the MPT rule that embedded nodes must RLP-encode to fewer than 32 bytes. We now check embedded subnodes in
check_branch_nodeandcheck_extension_nodeand error if their RLP size is ≥ 32. This hardens trie validation without affecting valid tries.Closes #1376.