SIMD-0129: Alt_BN128 Syscalls - Simplified Error Code

SIMD-0129 (Alt_BN128 Syscalls - Simplified Error Code) is a Core Standard Solana Improvement Document by Emanuele Cesena; proposal status Activated.

Active on mainnet-beta since epoch 635; active on testnet since epoch 657; active on devnet since epoch 714.

Feature gates

• Feature gate: SIMD-0129: simplify alt_bn128 syscall error codes
• Related gate: add alt_bn128 compression syscalls
• Related gate: Enable Poseidon syscall

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