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Arithmetic test vectors: add, sub, mul, div, rem, wide multiply.
Each operation has two faces:
<name>(input: &[u8], output: &mut [u8]) -> usize: a byte-level helper, the legacy unit-test entry point.<name>_suite() -> u64: runs the helper over a baked corpus of(a, b)pairs and XOR-folds the u64 results into a single fingerprint. Used by the three-way conformance harness.