feat: define AgentRegistry interface for agent identity

Author: tr-Kalyan

src/AgentRegistry.sol

@@ -0,0 +1,46 @@
+// Layout of Contract:
+// version
+// imports
+// errors
+// interfaces, libraries, contracts
+// Type declarations
+// State variables
+// Events
+// Modifiers
+// Functions
+
+// Layout of Functions:
+// constructor
+// receive function (if exists)
+// fallback function (if exists)
+// external
+// public
+// internal
+// private
+// internal & private view & pure functions
+// external & public view & pure functions
+
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.26;
+
+contract AgentRegistry {
+
+    struct Agent {
+        address owner;
+        bool active;
+    }
+
+    mapping(address => Agent) private agents;
+
+    event AgentRegistered(address indexed agent, address indexed owner);
+    event AgentRevoked(address indexed agent);
+    event AgentReactivated(address indexed agent);
+
+    function getAgent(address agent) external view returns (address owner, bool active) {}
+
+    function registerAgent(address agent) external {}
+
+    function revokeAgent(address agent) external {}
+
+    function reactivateAgent(address agent) external {}
+}