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Description
Replaces validation hook with a module validation signature that includes the transaction.
Additional context
The two step validation hook + module validation was needlessly complicated. It should have been rare for an external transaction to call isValidSignature as part of a session, but the validation flow was built around it.
Now that's supported via the same temporary transaction storage as before, but not as the primary path.
This was a long running interface debt between Clave and a partially implemented 7579 validation module.