[MOZGIII]

What

Makes the native and EVM transaction fees configurable at the state level.

The runtime prices fees from baseline constants that put a simple transfer at ~1 HMND / ~1 eHMND, and scales them by multipliers held in the state of the new pallet-humanode-fee-params.

Design

Multiplier	Applies to	Default
NativeFeeMultiplier	WeightToFee and LengthToFee of pallet_transaction_payment	1
EvmFeeMultiplier	FeeCalculator::min_gas_price of pallet_evm	2

• The multipliers are FixedU128, so fractional values work.
• Root sets them via set_native_fee_multiplier / set_evm_fee_multiplier; each emits an ...Updated event.
• The defaults encode the intent that an EVM transfer costs double the native one: the native path is the more efficient way to transact, so it stays the one we push users towards.
• The runtime plugs the pallet in through two adapters it exports: NativeWeightToFee<Runtime, Baseline> wrapping the existing ConstantMultipliers, and EvmFeeCalculator<Runtime, BaselineFeePerGas> replacing the former EvmFeePerGas.
• Constants renamed to reflect their new role: WEIGHT_TO_FEE_BASELINE, LENGTH_TO_FEE_BASELINE, FEE_PER_GAS_BASELINE.

Upgrade path

Chains upgrading from the previous runtime keep their current fee levels. The EnactFeeMultipliers migration, driven by the pallet's storage version going 0 → 1, sets the multipliers to NativeFeeMultiplierBeforeFeeParams (10) and EvmFeeMultiplierBeforeFeeParams (15), which reproduce the previous WEIGHT_TO_FEE and FEE_PER_GAS values. The EVM one matches within 0.1%, as the old gas price was a hand-rounded number.

New networks start from the pallet defaults; 10 and 15 exist only in the migration.

Tests

• Pallet: genesis, setters and origins, fractional values, the migration (enact, no-op, try-runtime hooks), and both adapters.
• Runtime tests::fees: the existing cases follow the defaults of 1 and 2, and new cases change each multiplier and check the fee follows, plus one that runs the migration and checks the previous fee levels come out.
• E2E base/rpc: the dev node expectations are 1 HMND / 2 eHMND, and new cases set each multiplier through sudo.

Reviewer notes

• The weights in crates/humanode-runtime/src/weights/pallet_humanode_fee_params.rs are hand-written as a placeholder and need regenerating with utils/weights/benchmark-all.
• spec_version bump goes in a separate PR, as usual.