CCIPGatewayAdapterStorage

struct CCIPGatewayAdapterStorage {
    /// @notice The Chainlink CCIP router (OZ-style immutable → Diamond storage). APPEND-ONLY.
    address _router;
    /// @notice Fee token: `address(0)` ⇒ native (`msg.value`), else an ERC-20 (e.g. LINK). APPEND-ONLY.
    address _feeToken;
    /// @notice EVM chainId => CCIP chain selector (0 = unset). APPEND-ONLY.
    mapping(uint256 chainId => uint64 selector) _chainIdToSelector;
    /// @notice CCIP chain selector => EVM chainId (0 = unset). APPEND-ONLY.
    mapping(uint64 selector => uint256 chainId) _selectorToChainId;
    /// @notice Trusted remote gateway adapter per EVM chainId. APPEND-ONLY.
    mapping(uint256 chainId => address remote) _remoteGateways;
    /// @notice Per-destination delivery gas limit (0 = unconfigured). APPEND-ONLY.
    mapping(uint256 chainId => uint256 gasLimit) _destGasLimit;
    /// @notice Per-destination `allowOutOfOrderExecution` flag. APPEND-ONLY.
    mapping(uint256 chainId => bool allowOutOfOrder) _destAllowOutOfOrder;
    /// @notice Replay guard: per source chainId, the set of consumed CCIP messageIds. APPEND-ONLY.
    mapping(uint256 chainId => mapping(bytes32 messageId => bool used)) _executed;
    /// @notice Per source chainId, the CCV requirements + finality returned to the router (V2/CCV). APPEND-ONLY.
    mapping(uint256 chainId => CCVConfig) _ccvConfigs;
}