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/@nomicfoundation/hardhat-utils/src/internal/hex.ts

@@ -0,0 +1,21 @@
+import {
+  getPrefixedHexString,
+  getUnprefixedHexString,
+  isPrefixedHexString,
+} from "../hex.js";
+
+export function padToEven(value: string): string {
+  const isPrefixed = isPrefixedHexString(value);
+  const unprefixed = getUnprefixedHexString(value);
+
+  let padded;
+  if (unprefixed.length === 0) {
+    // Pad the empty string with a single zero, as Buffer.from([]) will not
+    // interpret it correctly otherwise.
+    padded = "00";
+  } else {
+    padded = unprefixed.length % 2 === 0 ? unprefixed : `0${unprefixed}`;
+  }
+
+  return isPrefixed ? getPrefixedHexString(padded) : padded;
+}