feat: Set swap executors and verifiers

- Moved the deployment method into a test template for organization
- Created skeletons of dispatcher contracts
- Added all possible test cases for thoroughness

foundry/src/CallbackVerificationDispatcher.sol

@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity ^0.8.0;
+
+/**
+ * @title Dispatch callback verification to external contracts
+ * @author PropellerHeads Devs
+ * @dev Provides the ability to delegate callback verification to external
+ *  contracts. This allows dynamically adding new supported protocols
+ *  without needing to upgrade any contracts. External contracts will
+ *  be called using delegatecall so they can share state with the main
+ *  contract if needed.
+ *
+ *  Note Verifier contracts need to implement the ICallbackVerifier interface
+ */
+contract CallbackVerificationDispatcher {
+    mapping(address => bool) public callbackVerifiers;
+}

foundry/src/SwapExecutionDispatcher.sol

@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity ^0.8.28;
+
+/**
+ * @title SwapExecutionDispatcher - Dispatch swap execution to external contracts
+ * @author PropellerHeads Devs
+ * @dev Provides the ability to delegate execution of swaps to external
+ *  contracts. This allows dynamically adding new supported protocols
+ *  without needing to upgrade any contracts. External contracts will
+ *  be called using delegatecall so they can share state with the main
+ *  contract if needed.
+ *
+ *  Note Executor contracts need to implement the ISwapExecutor interface
+ */
+contract SwapExecutionDispatcher {
+    mapping(address => bool) public swapExecutors;
+}

foundry/src/TychoRouter.sol

@@ -2,14 +2,22 @@
 pragma solidity ^0.8.28;
 
 import "@openzeppelin/contracts/access/AccessControl.sol";
-import "@permit2/src/interfaces/IAllowanceTransfer.sol";
 import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
 import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
+import "@permit2/src/interfaces/IAllowanceTransfer.sol";
+import "./SwapExecutionDispatcher.sol";
+import "./CallbackVerificationDispatcher.sol";
 
 error TychoRouter__WithdrawalFailed();
 error TychoRouter__InvalidReceiver();
+error TychoRouter__NonContractExecutor();
+error TychoRouter__NonContractVerifier();
 
-contract TychoRouter is AccessControl {
+contract TychoRouter is
+    AccessControl,
+    SwapExecutionDispatcher,
+    CallbackVerificationDispatcher
+{
     IAllowanceTransfer public immutable permit2;
 
     using SafeERC20 for IERC20;
@@ -68,7 +76,55 @@ contract TychoRouter is AccessControl {
         external
         onlyRole(DEFAULT_ADMIN_ROLE)
     {
-        // TODO
+        for (uint256 i = 0; i < accounts.length; i++) {
+            _grantRole(role, accounts[i]);
+        }
+    }
+
+    /**
+     * @dev Entrypoint to add or replace an approved swap executor contract address
+     * @param target address of the swap method contract
+     */
+    function setSwapExecutor(address target)
+        external
+        onlyRole(EXECUTOR_SETTER_ROLE)
+    {
+        if (target.code.length == 0) revert TychoRouter__NonContractExecutor();
+        swapExecutors[target] = true;
+    }
+
+    /**
+     * @dev Entrypoint to remove an approved swap executor contract address
+     * @param target address of the swap method contract
+     */
+    function removeSwapExecutor(address target)
+        external
+        onlyRole(EXECUTOR_SETTER_ROLE)
+    {
+        delete swapExecutors[target];
+    }
+
+    /**
+     * @dev Entrypoint to add or replace an approved swap executor contract address
+     * @param target address of the swap method contract
+     */
+    function setCallbackVerifier(address target)
+        external
+        onlyRole(EXECUTOR_SETTER_ROLE)
+    {
+        if (target.code.length == 0) revert TychoRouter__NonContractVerifier();
+        callbackVerifiers[target] = true;
+    }
+
+    /**
+     * @dev Entrypoint to remove an approved swap executor contract address
+     * @param target address of the swap method contract
+     */
+    function removeCallbackVerifier(address target)
+        external
+        onlyRole(EXECUTOR_SETTER_ROLE)
+    {
+        delete callbackVerifiers[target];
     }
 
     /**