Atomically set ERC-1967 and enforce implementation invariants

src/DefaultReceiver.sol

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+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.23;
+
+import {Receiver} from "solady/accounts/Receiver.sol";
+
+/// @title DefaultReceiver
+///
+/// @notice A concrete implementation of Solady's Receiver contract
+///
+/// @dev Handles ETH, ERC721, and ERC1155 token transfers
+contract DefaultReceiver is Receiver {
+// We don't need to override any functions since the base contract
+// already implements all the necessary functionality:
+// - receive() for ETH
+// - fallback() with receiverFallback modifier for ERC721/ERC1155
+// - _useReceiverFallbackBody() returns true
+// - _beforeReceiverFallbackBody() empty implementation
+// - _afterReceiverFallbackBody() empty implementation
+}