Make OUSD EIP-7702 compatible and simplify yield delegation process.

contracts/contracts/token/OUSD.sol

@@ -465,7 +465,8 @@ contract OUSD is Governable {
      * @param _account Address of the account.
      */
     function _autoMigrate(address _account) internal {
-        bool isContract = _account.code.length > 0;
+        bool isContract = _account.code.length > 0 &&
+            bytes3(_account.code) != 0xef0100;
         // In previous code versions, contracts would not have had their
         // rebaseState[_account] set to RebaseOptions.NonRebasing when migrated
         // therefore we check the actual accounting used on the account instead.

contracts/deploy/mainnet/143_ousd_upgrade_EIP7702.js

@@ -0,0 +1,34 @@
+const { deploymentWithGovernanceProposal } = require("../../utils/deploy");
+
+module.exports = deploymentWithGovernanceProposal(
+  {
+    deployName: "143_ousd_upgrade_EIP7702",
+    forceDeploy: false,
+    //forceSkip: true,
+    reduceQueueTime: true,
+    deployerIsProposer: false,
+    proposalId: "",
+  },
+  async ({ deployWithConfirmation }) => {
+    // Deployer Actions
+    // ----------------
+
+    // 1. Deploy new OUSD implementation without storage slot checks
+    const dOUSD = await deployWithConfirmation("OUSD", [], "OUSD", true);
+    const cOUSDProxy = await ethers.getContract("OUSDProxy");
+
+    // Governance Actions
+    // ----------------
+    return {
+      name: "Upgrade OUSD token contract",
+      actions: [
+        // 1. Upgrade the OUSD proxy to the new implementation
+        {
+          contract: cOUSDProxy,
+          signature: "upgradeTo(address)",
+          args: [dOUSD.address],
+        },
+      ],
+    };
+  }
+);