Golden test fixtures don't yet carry a value they're now checked against

A new field was added to the golden test fixture format:

https://github.com/Cyphrme/Cyphr/blob/0bbaa9fd27939b06a465aa134aad7f1f8ee406db/rs/test-fixtures/src/golden.rs#L118-L125

...and is now checked when present:

https://github.com/Cyphrme/Cyphr/blob/0bbaa9fd27939b06a465aa134aad7f1f8ee406db/rs/cyphr/tests/golden_fixtures.rs#L160-L165

None of the ~47 already-committed fixture files carry this field, since they predate it, so the check above never actually runs against the persisted corpus — it's proven correct via a separate, dedicated round-trip test instead. A real regression-pinning value on disk is stronger than a same-code round-trip check; regenerating the fixture corpus to include this field would close the gap.

Start by reading rs/test-fixtures/src/golden.rs around lines 118-125 and rs/cyphr/tests/golden_fixtures.rs around lines 160-165 to understand the new field and its check. Regenerate or update the roughly 47 persisted fixture files so they contain the field, then run the golden fixture tests; done means the on-disk corpus exercises the check rather than only the round-trip test.

Written by the indexing model from the issue text.