fn t7_gas_params() -> GasParamsExpand description
Builds the T7 gas table: TIP-1000 creation costs, but the SSTORE creation
cost is lowered to the 5k residual (SSTORE_SET_COST) per TIP-1060.
revm charges this residual through sstore_dynamic_gas under the same
original == present == 0 condition as the upstream storage-set cost, so a
dirty recreation (x→0→y) is charged neither the residual nor the base
set cost. The 245k creditable portion is charged (or covered by a credit) by
the storage-credit hook in sstore_storage_credits.