EIP-7843: SLOTNUM opcode#2872
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Add the SLOTNUM opcode (0x4b, EIP-7843): a NullStackOp pushing the block's slot number (already parsed into <slotNumber>) at a fixed Gbase (2) cost, disassembled from byte 75 and gated on the new Ghasslotnum schedule flag (true at AMSTERDAM). Unmask the four for_amsterdam SLOTNUM conformance fixtures; two sub-cases (value/slot_zero, gas_cost/out_of_gas) remain masked pending the separate Amsterdam Csstore cold-no-op repricing (EIP-8037/8038). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Implements EIP-7843: SLOTNUM pushes the current beacon-chain slot number (from the Amsterdam header field).
Changes:
evm.md: SLOTNUM opcode;schedule.md:Ghasslotnum+ gas cost.