chore: .gitignore and README updates

Made-with: Cursor

test/integration/UniversalBridge.t.sol

@@ -6,8 +6,65 @@ import "../../contracts/registry/UniversalAssetRegistry.sol";
 import "../../contracts/bridge/UniversalCCIPBridge.sol";
 import "../../contracts/bridge/BridgeOrchestrator.sol";
 import "../../contracts/governance/GovernanceController.sol";
+import "../../contracts/interfaces/IRegulatedAssetMetadata.sol";
 import "@openzeppelin/contracts/proxy/ERC1967/ERC1967Proxy.sol";
 
+/// @dev Minimal `IRegulatedAssetMetadata` so `_syncAssetMetadata` ABI-decodes cleanly
+/// (Solidity try/catch does not catch return-data decode panics for empty/wrong-length returndata).
+contract MockRegulatedAsset is IRegulatedAssetMetadata {
+    function assetId() external pure override returns (bytes32) {
+        return keccak256("MOCK_ASSET");
+    }
+
+    function assetVersionId() external pure override returns (bytes32) {
+        return keccak256("MOCK_VER");
+    }
+
+    function governanceProfileId() external pure override returns (bytes32) {
+        return bytes32(0);
+    }
+
+    function supervisionProfileId() external pure override returns (bytes32) {
+        return bytes32(0);
+    }
+
+    function storageNamespace() external pure override returns (bytes32) {
+        return bytes32(0);
+    }
+
+    function primaryJurisdiction() external pure override returns (string memory) {
+        return "";
+    }
+
+    function regulatoryDisclosureURI() external pure override returns (string memory) {
+        return "";
+    }
+
+    function reportingURI() external pure override returns (string memory) {
+        return "";
+    }
+
+    function canonicalUnderlyingAsset() external pure override returns (address) {
+        return address(0);
+    }
+
+    function supervisionRequired() external pure override returns (bool) {
+        return false;
+    }
+
+    function governmentApprovalRequired() external pure override returns (bool) {
+        return false;
+    }
+
+    function minimumUpgradeNoticePeriod() external pure override returns (uint256) {
+        return 0;
+    }
+
+    function wrappedTransport() external pure override returns (bool) {
+        return false;
+    }
+}
+
 /**
  * @title UniversalBridge Integration Tests
  * @notice Comprehensive tests for all asset types through full bridge flow.
@@ -86,10 +143,9 @@ contract UniversalBridgeTest is Test {
         // Add validator
         registry.addValidator(user1);
         
-        // Create proposal
-        address mockToken = makeAddr("mockToken2");
-        vm.etch(mockToken, hex"00");
-        
+        // Create proposal (real contract: metadata sync ABI-decodes return data; empty etch breaks execute)
+        address mockToken = address(new MockRegulatedAsset());
+
         bytes32 proposalId = registry.proposeAsset(
             mockToken,
             UniversalAssetRegistry.AssetType.Stablecoin,