Enforce RLP execution block size limit (EIP-7934)

[mw2000]

Summary

Reject any block whose RLP-encoded size exceeds 10 MiB (10,485,760 bytes). Activates with Fusaka.

Spec

• EIP-7934: Add RLP Execution Block Size Limit — https://eips.ethereum.org/EIPS/eip-7934

Scope

• Add Fusaka hardfork + EIP-7934 flag to EEVM.HardforkConfig.
• In the BlockchainTest runner (and any future block-import path), measure encoded block size and reject when it exceeds the limit and the flag is active.

Definition of Done

• Oversized-block fixtures under Fusaka trigger a validation error.
• Below-limit blocks continue to import.

Parent

• EVM Completeness: Missing opcodes, precompiles, and gas rules #30 — EVM Completeness tracking issue