refactor: move brother_node development artifact to dev/test-nodes subdirectory

Development Artifact Cleanup:
✅ BROTHER_NODE REORGANIZATION: Moved development test node to appropriate location
- dev/test-nodes/brother_node/: Moved from root directory for better organization
- Contains development configuration, test logs, and test chain data
- No impact on production systems - purely development/testing artifact

✅ DEVELOPMENT ARTIFACTS IDENTIFIED:
- Chain ID: aitbc-brother-chain (test/development chain)
- Ports: 8010 (P2P) and 8011 (RPC) - different from production
- Environment: .env file with test configuration
- Logs: rpc.log and node.log from development testing session (March 15, 2026)

✅ ROOT DIRECTORY CLEANUP: Removed development clutter from production directory
- brother_node/ moved to dev/test-nodes/brother_node/
- Root directory now contains only production-ready components
- Development artifacts properly organized in dev/ subdirectory

DIRECTORY STRUCTURE IMPROVEMENT:
📁 dev/test-nodes/: Development and testing node configurations
🏗️ Root Directory: Clean production structure with only essential components
🧪 Development Isolation: Test environments separated from production

BENEFITS:
✅ Clean Production Directory: No development artifacts in root
✅ Better Organization: Development nodes grouped in dev/ subdirectory
✅ Clear Separation: Production vs development environments clearly distinguished
✅ Maintainability: Easier to identify and manage development components

RESULT: Successfully moved brother_node development artifact to dev/test-nodes/ subdirectory, cleaning up the root directory while preserving development testing environment for future use.

dev/env/node_modules/hardhat/coverage.sol

@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: MIT
+pragma solidity >=0.4.22 <0.9.0;
+
+library __HardhatCoverage {
+  address constant COVERAGE_ADDRESS =
+    0xc0bEc0BEc0BeC0bEC0beC0bEC0bEC0beC0beC0BE;
+
+  function _sendHitImplementation(uint256 coverageId) private view {
+    address coverageAddress = COVERAGE_ADDRESS;
+    /// @solidity memory-safe-assembly
+    assembly {
+      let ptr := mload(0x40)           // Get free memory pointer
+      mstore(ptr, coverageId)          // Store coverageId at free memory
+      pop(
+        staticcall(
+          gas(),
+          coverageAddress,
+          ptr,
+          32,                          // Size of uint256 is 32 bytes
+          0,
+          0
+        )
+      )
+    }
+  }
+
+  function _castToPure(
+    function(uint256) internal view fnIn
+  ) private pure returns (function(uint256) pure fnOut) {
+    assembly {
+      fnOut := fnIn
+    }
+  }
+
+  function sendHit(uint256 coverageId) internal pure {
+    _castToPure(_sendHitImplementation)(coverageId);
+  }
+}