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Replace SHA256Hasher with Poseidon2Hasher in the Rust SMT and rewrite the Noir circuit hash helpers to use Poseidon2 field-element arrays. This drastically reduces ZK circuit constraints since Poseidon2 is native to the BN254 proving backend. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Update compiled circuit JSON, VK, and frontend public copy after the SHA256 to Poseidon2 hashing migration. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Switch SMT hashing from SHA256 to Poseidon2 (BN254-native)
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