fix(l1,l2): forbid hash override on empty-path insert in branch/leaf #5468
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Replace unresolved todo!() with explicit verification errors when inserting an external hash at the exact target path. In
BranchNode::insert() (empty path) and the analogous case in LeafNode::insert() (attempt to set branch value from a hash), return TrieError::Verify instead of allowing override or panicking. This aligns with existing safeguards that allow hashes only in empty child slots and prevents replacing existing nodes/values at the target path.