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CREATE2 deployment calibration previously supplied initcode bytes and the child gas allowance to Lean. This change derives both from actual parent byte memory and gas, charges Osaka memory/initcode costs, executes the account transition, refunds unused child gas and zero-extends expanded memory.
This draft is stacked on the immutable bytes-header branch. CREATE2 still rejects in solidity_import: canonical Stmt/compiler integration, complete frame gas tracking and the source storage/memory relations remain required. No golden model or pilot provenance changed.
Focused validation: 22 actual EVM/Lean opcode-world observations, 23 public kernel audits using only standard axioms, four executable mutants detected with one-call replay witnesses, generator and trust-report checks. Failed build/mutation receipts were preserved; a divisor mutant blocked by an arithmetic theorem was replaced with an executable forwarding-expression mutation. Source-identical successes were retained across the test-only follow-up commit.
Full exact-head make check, Contracts, mutations, smoke/loss/programs/stateful and pinned pilot gates remain pending. This is not ready to merge. Main currently requires linear history, conflicting with the required merge-commit policy.