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/lang.ts

@@ -0,0 +1,120 @@
+import {
+  customFastEqual,
+  deepMergeImpl,
+  getDeepCloneFunction,
+} from "./internal/lang.js";
+
+/**
+ * Creates a deep clone of the provided value.
+ *
+ * @param value The value to clone.
+ * @returns The deep clone of the provided value.
+ */
+export async function deepClone<T>(value: T): Promise<T> {
+  const _deepClone = await getDeepCloneFunction();
+
+  return _deepClone<T>(value);
+}
+
+/**
+ * Checks if two values are deeply equal.
+ *
+ * @param x The first value to compare.
+ * @param y The second value to compare.
+ * @returns True if the values are deeply equal, false otherwise.
+ */
+export async function deepEqual<T>(x: T, y: T): Promise<boolean> {
+  return customFastEqual(x, y);
+}
+
+/**
+ * Deeply merges two objects.
+ *
+ * @remarks
+ * - Arrays or `undefined` values are not valid inputs.
+ * - Functions: If a function exists in both the target and source, the source
+ * function overwrites the target.
+ * - Symbol properties: Symbol-keyed properties are merged just like string
+ * keys.
+ * - Class instances: Class instances are not merged recursively. If a class
+ * instance exists in the source, it will replace the one in the target.
+ *
+ * @param target The target object to merge into.
+ * @param source The source object to merge from.
+ * @param shouldOverwriteUndefined If true, properties with `undefined` values
+ * in the source will overwrite those in the target. Default is true.
+ * @returns A new object containing the deeply merged properties.
+ *
+ * @example
+ * deepMerge({ a: { b: 1 } }, { a: { c: 2 } }) // => { a: { b: 1, c: 2 } }
+ *
+ * deepMerge(
+ *   { a: { fn: () => "from target" } },
+ *   { a: { fn: () => "from source" } }
+ * ) // => { a: { fn: () => "from source" } }
+ */
+export function deepMerge<T extends object, U extends object>(
+  target: T,
+  source: U,
+  shouldOverwriteUndefined: boolean = true,
+): T & U {
+  return deepMergeImpl(target, source, shouldOverwriteUndefined);
+}
+
+/**
+ * Checks if a value is an object. This function returns false for arrays.
+ *
+ * @param value The value to check.
+ * @returns True if the value is an object, false otherwise.
+ */
+export function isObject(
+  value: unknown,
+): value is Record<string | symbol, unknown> {
+  return typeof value === "object" && value !== null && !Array.isArray(value);
+}
+
+/**
+ * Pauses the execution for the specified number of seconds.
+ *
+ * @param seconds The number of seconds to pause the execution.
+ * @returns A promise that resolves after the specified number of seconds.
+ */
+export async function sleep(seconds: number): Promise<void> {
+  await new Promise((resolve) => setTimeout(resolve, seconds * 1000));
+}
+
+/**
+ * Binds all methods of an object to the object itself, so that they can be
+ * assigned to an independent variable and still work.
+ *
+ * @param obj The object, which can be an instance of a class.
+ */
+export function bindAllMethods<ObjectT extends object>(obj: ObjectT): void {
+  const prototype = Object.getPrototypeOf(obj);
+  const prototypeKeys =
+    prototype !== null ? Object.getOwnPropertyNames(prototype) : [];
+
+  const keys = [...prototypeKeys, ...Object.getOwnPropertyNames(obj)];
+
+  /* eslint-disable-next-line @typescript-eslint/consistent-type-assertions --
+    typescript can't express this in a safe way, so we use any here */
+  const objAsAny = obj as any;
+
+  // Exclude methods that should not be rebound (constructor, Object.prototype methods, etc.)
+  const EXCLUDED_METHODS = [
+    "constructor",
+    "hasOwnProperty",
+    "isPrototypeOf",
+    "propertyIsEnumerable",
+    "toLocaleString",
+    "toString",
+    "valueOf",
+  ];
+
+  for (const key of keys) {
+    const val = objAsAny[key];
+    if (typeof val === "function" && !EXCLUDED_METHODS.includes(key)) {
+      objAsAny[key] = val.bind(obj);
+    }
+  }
+}