chore(security): enhance environment configuration, CI workflows, and wallet daemon with security improvements

- Restructure .env.example with security-focused documentation, service-specific environment file references, and AWS Secrets Manager integration
- Update CLI tests workflow to single Python 3.13 version, add pytest-mock dependency, and consolidate test execution with coverage
- Add comprehensive security validation to package publishing workflow with manual approval gates, secret scanning, and release

contracts/test/fuzz/DAOGovernor.t.sol

@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.20;
+
+import "forge-std/Test.sol";
+import "../../contracts/DAOGovernor.sol";
+import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
+
+contract DAOGovernorFuzzTest is Test {
+    DAOGovernor public governor;
+    ERC20 public govToken;
+    address public owner;
+    address public proposer;
+    address public voter;
+
+    function setUp() public {
+        owner = address(this);
+        proposer = makeAddr("proposer");
+        voter = makeAddr("voter");
+        govToken = new ERC20("GovToken", "GOV");
+        governor = new DAOGovernor(address(govToken));
+
+        // Mint tokens and delegate
+        vm.prank(owner);
+        govToken.mint(voter, 1000e18);
+        vm.prank(voter);
+        govToken.delegate(voter);
+    }
+
+    function invariant_quorumInvariant() public {
+        uint256 quorum = governor.quorum();
+        uint256 totalSupply = govToken.totalSupply();
+        assertLe(quorum, totalSupply, "Quorum cannot exceed total supply");
+    }
+
+    function testFuzz_ProposalFlow(uint256 amount, uint256 votes) public {
+        vm.assume(amount >= 1e18 && amount <= 1000e18);
+        vm.assume(votes >= 1e18 && votes <= 1000e18);
+
+        vm.prank(owner);
+        govToken.mint(proposer, amount);
+        vm.prank(proposer);
+        govToken.delegate(proposer);
+
+        // Create proposal
+        address[] memory targets = new address[](1);
+        targets[0] = address(governor);
+        uint256[] memory values = new uint256[](1);
+        values[0] = 0;
+        bytes[] memory calldatas = new bytes[](1);
+        calldatas[0] = abi.encodeWithSignature("setQuorum(uint256)", 1000);
+
+        vm.prank(proposer);
+        governor.propose(targets, values, calldatas, "Test proposal");
+    }
+}