feat(ctb): LivenessGuard record current owners in constructor

packages/contracts-bedrock/src/Safe/LivenessGuard.sol

@@ -45,6 +45,12 @@ contract LivenessGuard is ISemver, BaseGuard {
     /// @param _safe The safe account for which this contract will be the guard.
     constructor(Safe _safe) {
         SAFE = _safe;
+        address[] memory owners = _safe.getOwners();
+        for (uint256 i = 0; i < owners.length; i++) {
+            address owner = owners[i];
+            lastLive[owner] = block.timestamp;
+            emit OwnerRecorded(0x0, owner);
+        }
     }
 
     /// @notice Internal function to ensure that only the Safe can call certain functions.

packages/contracts-bedrock/test/LivenessGuard.t.sol

@@ -15,17 +15,29 @@ contract LivenessGuard_TestInit is Test, SafeTestTools {
 
     event OwnerRecorded(bytes32 indexed txHash, address signer);
 
+    uint256 initTime = 10;
     LivenessGuard livenessGuard;
     SafeInstance safeInstance;
 
     /// @dev Sets up the test environment
     function setUp() public {
+        vm.warp(initTime);
         safeInstance = _setupSafe();
         livenessGuard = new LivenessGuard(safeInstance.safe);
         safeInstance.setGuard(address(livenessGuard));
     }
 }
 
+contract LivenessGuard_Constructor_Test is LivenessGuard_TestInit {
+    function test_constructor_works() external {
+        address[] memory owners = safeInstance.owners;
+        livenessGuard = new LivenessGuard(safeInstance.safe);
+        for (uint256 i = 0; i < owners.length; i++) {
+            assertEq(livenessGuard.lastLive(owners[i]), initTime);
+        }
+    }
+}
+
 contract LivenessGuard_Getters_Test is LivenessGuard_TestInit {
     /// @dev Tests that the getters return the correct values
     function test_getters_works() external {