chore: fix g2 test failing on merge-train#22920
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BEGIN_COMMIT_OVERRIDE
fix(ci): default S3_BUILD_CACHE_AWS_PARAMS in cache_s3_transfer{,_to}
(AztecProtocol#22898)
chore: low-hanging chonk prover fixes from profiling (AztecProtocol#22855)
chore: fuse N `add_scaled` into one `parallel_for` (AztecProtocol#22893)
feat: Delayed merge implementation (AztecProtocol#22775)
chore: numeric audit response (AztecProtocol#22856)
fix: harden BN254 G2 SRS ingress (AztecProtocol#22858)
fix: remove unused hash_challenge variable in batch_merge.test.cpp
(AztecProtocol#22906)
fix(bbup): remove jq dependency (AztecProtocol#22912)
chore: fix g2 test failing on merge-train (AztecProtocol#22920)
fix(ci): error on disabled-cache in CI hash calculation (AztecProtocol#22904)
END_COMMIT_OVERRIDE
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2.IsInPrimeSubgroupRejectsCofactorPoint used a hardcoded BN254 G2 cofactor point encoded as raw native Montgomery limbs. That works in the native build, but WASM uses a different internal Montgomery representation, so the same raw limbs decoded to a different point. In WASM, the fixture was not even on-curve, so the test failed at:
ASSERT_TRUE(off_subgroup.on_curve())
The fix is to express the point using canonical field coordinates instead of backend-specific Montgomery limbs:
fq2{ fq(2), fq(1) }
fq2{ fq("0x101f...01ce"), fq("0x2b76...5fde") }