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/@noble/hashes/src/pbkdf2.ts

@@ -0,0 +1,97 @@
+import { hash as assertHash, number as assertNumber } from './_assert.js';
+import { hmac } from './hmac.js';
+import { Hash, CHash, Input, createView, toBytes, checkOpts, asyncLoop } from './utils.js';
+
+// PBKDF (RFC 2898)
+export type Pbkdf2Opt = {
+  c: number; // Iterations
+  dkLen?: number; // Desired key length in bytes (Intended output length in octets of the derived key
+  asyncTick?: number; // Maximum time in ms for which async function can block execution
+};
+// Common prologue and epilogue for sync/async functions
+function pbkdf2Init(hash: CHash, _password: Input, _salt: Input, _opts: Pbkdf2Opt) {
+  assertHash(hash);
+  const opts = checkOpts({ dkLen: 32, asyncTick: 10 }, _opts);
+  const { c, dkLen, asyncTick } = opts;
+  assertNumber(c);
+  assertNumber(dkLen);
+  assertNumber(asyncTick);
+  if (c < 1) throw new Error('PBKDF2: iterations (c) should be >= 1');
+  const password = toBytes(_password);
+  const salt = toBytes(_salt);
+  // DK = PBKDF2(PRF, Password, Salt, c, dkLen);
+  const DK = new Uint8Array(dkLen);
+  // U1 = PRF(Password, Salt + INT_32_BE(i))
+  const PRF = hmac.create(hash, password);
+  const PRFSalt = PRF._cloneInto().update(salt);
+  return { c, dkLen, asyncTick, DK, PRF, PRFSalt };
+}
+
+function pbkdf2Output<T extends Hash<T>>(
+  PRF: Hash<T>,
+  PRFSalt: Hash<T>,
+  DK: Uint8Array,
+  prfW: Hash<T>,
+  u: Uint8Array
+) {
+  PRF.destroy();
+  PRFSalt.destroy();
+  if (prfW) prfW.destroy();
+  u.fill(0);
+  return DK;
+}
+
+/**
+ * PBKDF2-HMAC: RFC 2898 key derivation function
+ * @param hash - hash function that would be used e.g. sha256
+ * @param password - password from which a derived key is generated
+ * @param salt - cryptographic salt
+ * @param opts - {c, dkLen} where c is work factor and dkLen is output message size
+ */
+export function pbkdf2(hash: CHash, password: Input, salt: Input, opts: Pbkdf2Opt) {
+  const { c, dkLen, DK, PRF, PRFSalt } = pbkdf2Init(hash, password, salt, opts);
+  let prfW: any; // Working copy
+  const arr = new Uint8Array(4);
+  const view = createView(arr);
+  const u = new Uint8Array(PRF.outputLen);
+  // DK = T1 + T2 + ⋯ + Tdklen/hlen
+  for (let ti = 1, pos = 0; pos < dkLen; ti++, pos += PRF.outputLen) {
+    // Ti = F(Password, Salt, c, i)
+    const Ti = DK.subarray(pos, pos + PRF.outputLen);
+    view.setInt32(0, ti, false);
+    // F(Password, Salt, c, i) = U1 ^ U2 ^ ⋯ ^ Uc
+    // U1 = PRF(Password, Salt + INT_32_BE(i))
+    (prfW = PRFSalt._cloneInto(prfW)).update(arr).digestInto(u);
+    Ti.set(u.subarray(0, Ti.length));
+    for (let ui = 1; ui < c; ui++) {
+      // Uc = PRF(Password, Uc−1)
+      PRF._cloneInto(prfW).update(u).digestInto(u);
+      for (let i = 0; i < Ti.length; i++) Ti[i] ^= u[i];
+    }
+  }
+  return pbkdf2Output(PRF, PRFSalt, DK, prfW, u);
+}
+
+export async function pbkdf2Async(hash: CHash, password: Input, salt: Input, opts: Pbkdf2Opt) {
+  const { c, dkLen, asyncTick, DK, PRF, PRFSalt } = pbkdf2Init(hash, password, salt, opts);
+  let prfW: any; // Working copy
+  const arr = new Uint8Array(4);
+  const view = createView(arr);
+  const u = new Uint8Array(PRF.outputLen);
+  // DK = T1 + T2 + ⋯ + Tdklen/hlen
+  for (let ti = 1, pos = 0; pos < dkLen; ti++, pos += PRF.outputLen) {
+    // Ti = F(Password, Salt, c, i)
+    const Ti = DK.subarray(pos, pos + PRF.outputLen);
+    view.setInt32(0, ti, false);
+    // F(Password, Salt, c, i) = U1 ^ U2 ^ ⋯ ^ Uc
+    // U1 = PRF(Password, Salt + INT_32_BE(i))
+    (prfW = PRFSalt._cloneInto(prfW)).update(arr).digestInto(u);
+    Ti.set(u.subarray(0, Ti.length));
+    await asyncLoop(c - 1, asyncTick, () => {
+      // Uc = PRF(Password, Uc−1)
+      PRF._cloneInto(prfW).update(u).digestInto(u);
+      for (let i = 0; i < Ti.length; i++) Ti[i] ^= u[i];
+    });
+  }
+  return pbkdf2Output(PRF, PRFSalt, DK, prfW, u);
+}