feat: recreate remaining missing agent smart contracts from docs

contracts/contracts/CrossChainReputation.sol

@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.19;
+
+import "@openzeppelin/contracts/access/Ownable.sol";
+
+contract CrossChainReputation is Ownable {
+    struct Reputation {
+        uint256 score;
+        uint256 taskCompleted;
+        uint256 disputeLost;
+        uint256 lastUpdated;
+    }
+
+    mapping(address => Reputation) public reputations;
+
+    event ReputationUpdated(address indexed agent, uint256 newScore);
+
+    function updateReputation(address _agent, uint256 _score, uint256 _tasks, uint256 _disputes) external onlyOwner {
+        reputations[_agent] = Reputation(_score, _tasks, _disputes, block.timestamp);
+        emit ReputationUpdated(_agent, _score);
+    }
+
+    function getReputation(address _agent) external view returns (uint256) {
+        return reputations[_agent].score;
+    }
+}