Adding changes needed for the SetTokenTransferFee Update

[sowgandhi11]

• Removed the upper bound for identifying the latest FQ address

• Returning the AddressRef data for the FeeQuoter

• Added a new method GetFeeContractRef(e cldf.Environment, src uint64, dst uint64) (AddressRef, error)

• Added a fees.go adapter implementation for CCIP 2.0

[github-actions]

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[Copilot]

Pull request overview

This PR updates the fee deployment flow to support SetTokenTransferFee across newer CCIP FeeQuoter versions by (a) discovering the deployed fee contract/version from the datastore, (b) returning AddressRef for fee contracts, and (c) adding an EVM CCIP 2.0 fee adapter implementation.

Changes:

• Extend the FeeAdapter interface with GetFeeContractRef(...) (datastore.AddressRef, error) and update EVM adapters to return AddressRef data.
• Update the SetTokenTransferFee changeset to select an adapter based on the discovered on-chain fee contract version.
• Add a CCIP 2.0 EVM fees adapter and adjust v1.6 FeeQuoter “latest address” selection logic.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 11 comments.

Show a summary per file

File	Description
deployment/fees/set_token_transfer_fee.go	Selects fee adapter based on discovered fee contract ref/version before executing the update sequence.
deployment/fees/product.go	Extends FeeAdapter interface to expose fee contract AddressRef.
chains/evm/deployment/v2_0_0/adapters/fees.go	New CCIP 2.0 EVM fees adapter implementation (FeeQuoter-based).
chains/evm/deployment/v1_6_0/sequences/adapter.go	Updates FeeQuoter “latest version” selection to remove the previous upper bound.
chains/evm/deployment/v1_5_0/adapters/fees.go	Updates v1.5 fee adapter to return a fee contract AddressRef (OnRamp-based).

Comments suppressed due to low confidence (1)

deployment/fees/set_token_transfer_fee.go:132

• inferTokenTransferFeeArgs is called with adapter (resolved from cfg.Version), but the actual sequence execution uses updater (resolved from the on-chain fee contract ref version). If cfg.Version differs from the deployed contract version, inference may query the wrong ABI/contract and fail or infer incorrect defaults. Consider selecting a single adapter based on the discovered contract ref version and using it consistently for inference and updates (or error if versions disagree).

				settings[dst.Selector] = map[string]*TokenTransferFeeArgs{}
				for _, feeCfg := range dst.Settings {
					if args, err := inferTokenTransferFeeArgs(adapter, e, src.Selector, dst.Selector, feeCfg); err != nil {
						return cldf.ChangesetOutput{}, fmt.Errorf("failed to infer token transfer fee args for token %s: %w", feeCfg.Address, err)
					} else {

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[github-actions]

Metric	fix/set-token-transfer-fee-fq2.0	main
Coverage	70.1%	69.8%