test(crypto): keep mock circuits impure for live

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Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

Same technique already applied to MockEcdsa in #842.

Not visible in the diff:

• Every crypto mock circuit was pure, so the artifacts shipped no keys/ or zkir/ and the specs passed on unit-live without proving anything. The _invocations counter is the only lever that forces impurity. Nothing was kept pure: none of these circuits is an oracle recomputing an expected value.
• The counter is underscore-prefixed so it stays out of the generated ledger() reader. getPublicState() is still {} and the simulator ledger types are unchanged.
• MockElGamal deploys 16 circuits where it deployed none. That is inside the local-node block-limit band, so the first live run has to confirm the deploy fits.
• The suites only prove on a live run: live-tests label or a workflow dispatch.

PR Checklist

• I have read the Contributing Guide
• I have added tests that prove my fix is effective or that my feature works. See GUIDELINES.md#testing for more information.
• I have added documentation for new methods or changes to existing method behavior. See GUIDELINES.md#documentation for more information.
• CI Workflows Are Passing

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