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/curves/src/jubjub.ts

@@ -0,0 +1,58 @@
+/*! noble-curves - MIT License (c) 2022 Paul Miller (paulmillr.com) */
+import { sha512 } from '@noble/hashes/sha512';
+import { concatBytes, randomBytes, utf8ToBytes } from '@noble/hashes/utils';
+import { twistedEdwards } from './abstract/edwards.js';
+import { blake2s } from '@noble/hashes/blake2s';
+import { Field } from './abstract/modular.js';
+
+/**
+ * jubjub Twisted Edwards curve.
+ * https://neuromancer.sk/std/other/JubJub
+ * jubjub does not use EdDSA, so `hash`/sha512 params are passed because interface expects them.
+ */
+
+export const jubjub = /* @__PURE__ */ twistedEdwards({
+  // Params: a, d
+  a: BigInt('0x73eda753299d7d483339d80809a1d80553bda402fffe5bfeffffffff00000000'),
+  d: BigInt('0x2a9318e74bfa2b48f5fd9207e6bd7fd4292d7f6d37579d2601065fd6d6343eb1'),
+  // Finite field 𝔽p over which we'll do calculations
+  // Same value as bls12-381 Fr (not Fp)
+  Fp: Field(BigInt('0x73eda753299d7d483339d80809a1d80553bda402fffe5bfeffffffff00000001')),
+  // Subgroup order: how many points curve has
+  n: BigInt('0xe7db4ea6533afa906673b0101343b00a6682093ccc81082d0970e5ed6f72cb7'),
+  // Cofactor
+  h: BigInt(8),
+  // Base point (x, y) aka generator point
+  Gx: BigInt('0x11dafe5d23e1218086a365b99fbf3d3be72f6afd7d1f72623e6b071492d1122b'),
+  Gy: BigInt('0x1d523cf1ddab1a1793132e78c866c0c33e26ba5cc220fed7cc3f870e59d292aa'),
+  hash: sha512,
+  randomBytes,
+} as const);
+
+const GH_FIRST_BLOCK = utf8ToBytes(
+  '096b36a5804bfacef1691e173c366a47ff5ba84a44f26ddd7e8d9f79d5b42df0'
+);
+
+// Returns point at JubJub curve which is prime order and not zero
+export function groupHash(tag: Uint8Array, personalization: Uint8Array) {
+  const h = blake2s.create({ personalization, dkLen: 32 });
+  h.update(GH_FIRST_BLOCK);
+  h.update(tag);
+  // NOTE: returns ExtendedPoint, in case it will be multiplied later
+  let p = jubjub.ExtendedPoint.fromHex(h.digest());
+  // NOTE: cannot replace with isSmallOrder, returns Point*8
+  p = p.multiply(jubjub.CURVE.h);
+  if (p.equals(jubjub.ExtendedPoint.ZERO)) throw new Error('Point has small order');
+  return p;
+}
+
+export function findGroupHash(m: Uint8Array, personalization: Uint8Array) {
+  const tag = concatBytes(m, new Uint8Array([0]));
+  for (let i = 0; i < 256; i++) {
+    tag[tag.length - 1] = i;
+    try {
+      return groupHash(tag, personalization);
+    } catch (e) {}
+  }
+  throw new Error('findGroupHash tag overflow');
+}