SIMD-0256: Increase Block Limits to 60M CUs

SIMD-0256 (Increase Block Limits to 60M CUs) is a Core Standard Solana Improvement Document by Brennan Watt (Anza); proposal status Activated.

Active on mainnet-beta since epoch 822; active on testnet since epoch 812; active on devnet since epoch 915.

Feature gates

• Feature gate: SIMD-0256: Raise block limit to 60M

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