- Add a comment at the code-mutation gate explaining the deliberate
len(code) > 0 (vs code != nil) match against non-BAL semantics; in
devnet-3 BAL access lists, an empty []byte is non-nil but encodes
"no code install".
- Remove BALStateTransitionMetrics.OriginStorageLoadTime: declared but
never assigned anywhere in the tree. The actual state-transition
read time is captured by AccountReadTime/StorageReadTime added in
the prior commit.
