Add mainnet checkpoint stack: ISO attestation, participant Etherscan surface, and services.

Ship AddressActivityRegistry V1/V2, ISO20022IntakeGateway, Chain138ParticipantSurface,
checkpoint hub contracts, checkpoint-core package, aggregator/indexer/sdk services,
relay profile guards, M00 diamond bridge facet, and OMNL compliance contracts.

Co-authored-by: Cursor <cursoragent@cursor.com>

script/deploy/vault/DeployCREATE2FactoryIfNeeded.s.sol

@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+import {Script, console2} from "forge-std/Script.sol";
+import {CREATE2Factory} from "../../../contracts/utils/CREATE2Factory.sol";
+
+/// @notice Deploy CREATE2Factory when missing on target chain (one-time CREATE).
+contract DeployCREATE2FactoryIfNeeded is Script {
+    function run() external {
+        address existing = vm.envOr("CREATE2_FACTORY_ADDRESS", address(0));
+        if (existing != address(0) && existing.code.length > 0) {
+            console2.log("CREATE2Factory already live:", existing);
+            return;
+        }
+
+        vm.startBroadcast(vm.envUint("PRIVATE_KEY"));
+        CREATE2Factory factory = new CREATE2Factory();
+        vm.stopBroadcast();
+        console2.log("CREATE2Factory deployed:", address(factory));
+    }
+}