feat: add hardfork configuration system#100

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mw2000 merged 6 commits intomainfrom

feat/issue-75-hardfork-config

Mar 22, 2026

Commits on Mar 21, 2026

feat: add HardforkConfig with spec_id enum and enabled?/2 helper

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feat: add hardfork field to Config, wire :hardfork option through MachineState.new/2

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feat: gate opcode implementations behind hardfork config checks

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feat: gate EIP-2929 cold/warm access and EIP-3529 refund cap by hardfork

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test: add hardfork config and opcode behavior tests across forks

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fix: format issues and correct pre-Berlin SLOAD gas test assertion

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