refactor: use receipt's nonce instead of outboundNonce (#70)

src/core/BaseRestakingController.sol

@@ -85,17 +85,16 @@ abstract contract BaseRestakingController is
     /// @param actionArgs The encodePacked arguments for the action.
     /// @param encodedRequest The encoded request.
     function _processRequest(Action action, bytes memory actionArgs, bytes memory encodedRequest) internal {
-        outboundNonce++;
-        _registeredRequests[outboundNonce] = encodedRequest;
-        _registeredRequestActions[outboundNonce] = action;
+        uint64 requestNonce = _sendMsgToExocore(action, actionArgs);
 
-        _sendMsgToExocore(action, actionArgs);
+        _registeredRequests[requestNonce] = encodedRequest;
+        _registeredRequestActions[requestNonce] = action;
     }
 
     /// @dev Sends a message to Exocore.
     /// @param action The action to be performed.
     /// @param actionArgs The encodePacked arguments for the action.
-    function _sendMsgToExocore(Action action, bytes memory actionArgs) internal {
+    function _sendMsgToExocore(Action action, bytes memory actionArgs) internal returns (uint64) {
         bytes memory payload = abi.encodePacked(action, actionArgs);
         bytes memory options = OptionsBuilder.newOptions().addExecutorLzReceiveOption(
             DESTINATION_GAS_LIMIT, DESTINATION_MSG_VALUE
@@ -105,6 +104,8 @@ abstract contract BaseRestakingController is
         MessagingReceipt memory receipt =
             _lzSend(EXOCORE_CHAIN_ID, payload, options, MessagingFee(fee.nativeFee, 0), msg.sender, false);
         emit MessageSent(action, receipt.guid, receipt.nonce, receipt.fee.nativeFee);
+
+        return receipt.nonce;
     }
 
 }

src/storage/ClientChainGatewayStorage.sol

@@ -16,9 +16,6 @@ import {IBeacon} from "@openzeppelin/contracts/proxy/beacon/IBeacon.sol";
 /// ClientChainGateway contract. Shared items should be kept in BootstrapStorage.
 contract ClientChainGatewayStorage is BootstrapStorage {
 
-    /// @notice The nonce for outbound messages.
-    uint64 public outboundNonce;
-
     /// @notice Mapping of owner addresses to their corresponding ExoCapsule contracts.
     mapping(address => IExoCapsule) public ownerToCapsule;