Migrate Amsterdam support from bal@v5.6.1 to bal@v5.7.0 (eels_commit 524b44617e410ab21b5122f0be5113b62a0e76ee, devnets/bal/4). - EIP-7928 (PR #2730): widen BAL index from u16 to u32 across StorageChange/CodeChange/BalanceChange/NonceChange, recorder, checkpoint, BalAddressIndex and all helpers. - EIP-8037 (PR #2687): dynamic cost_per_state_byte derived from block gas limit. New VM fields for per-block state-gas costs, gated by Fork::Amsterdam. 120M block gas keeps cpsb = 1174. - EIP-8037 (PRs #2698, #2733): SSTORE 0->N->0 reservoir refill via clamp-and-spill; per-frame state_gas_refund absorbed on success, discarded on revert; remainder spills to VM-level pending reservoir. - EIP-7976: calldata floor raised from 10 to 16 gas per token (Amsterdam-gated), with unweighted token count per spec. - EIP-7981: access-list data bytes (20/addr, 32/key) folded into floor-token count; applies in both regular and floor arms; mempool intrinsic-gas path mirrored. - EIP-8037 (PR #2689): top-level tx failure zeroes execution state_gas_used and refunds the reservoir; intrinsic state gas preserved. Routed through refund_sender. - EIP-7708 (PR #2717): audit confirmed invariants (lex-ordered burn logs, no coinbase priority-fee log, SELFDESTRUCT-dest coalescing) already held; added regression tests. - EIP-8037 (PR #2595): audit confirmed code-deposit state-gas discard on both oversized-code and deposit-OOG halts; added regression tests. Infra: .fixtures_url_amsterdam, Makefile, hive config and docs bumped to bal@v5.7.0 / devnets/bal/4. Tests: 185 levm tests green; new files cover EIP-8037 CPSB, refund clamp-and-spill, top-level reset, code-deposit discard, and combined EIP-7976+7981 scenarios.

LEVM: Move refunded_gas and transient_storage to Substate #2717

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