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/pbkdf2.js

@@ -0,0 +1,91 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.pbkdf2Async = exports.pbkdf2 = void 0;
+const _assert_js_1 = require("./_assert.js");
+const hmac_js_1 = require("./hmac.js");
+const utils_js_1 = require("./utils.js");
+// Common prologue and epilogue for sync/async functions
+function pbkdf2Init(hash, _password, _salt, _opts) {
+    (0, _assert_js_1.hash)(hash);
+    const opts = (0, utils_js_1.checkOpts)({ dkLen: 32, asyncTick: 10 }, _opts);
+    const { c, dkLen, asyncTick } = opts;
+    (0, _assert_js_1.number)(c);
+    (0, _assert_js_1.number)(dkLen);
+    (0, _assert_js_1.number)(asyncTick);
+    if (c < 1)
+        throw new Error('PBKDF2: iterations (c) should be >= 1');
+    const password = (0, utils_js_1.toBytes)(_password);
+    const salt = (0, utils_js_1.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_js_1.hmac.create(hash, password);
+    const PRFSalt = PRF._cloneInto().update(salt);
+    return { c, dkLen, asyncTick, DK, PRF, PRFSalt };
+}
+function pbkdf2Output(PRF, PRFSalt, DK, prfW, u) {
+    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
+ */
+function pbkdf2(hash, password, salt, opts) {
+    const { c, dkLen, DK, PRF, PRFSalt } = pbkdf2Init(hash, password, salt, opts);
+    let prfW; // Working copy
+    const arr = new Uint8Array(4);
+    const view = (0, utils_js_1.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);
+}
+exports.pbkdf2 = pbkdf2;
+async function pbkdf2Async(hash, password, salt, opts) {
+    const { c, dkLen, asyncTick, DK, PRF, PRFSalt } = pbkdf2Init(hash, password, salt, opts);
+    let prfW; // Working copy
+    const arr = new Uint8Array(4);
+    const view = (0, utils_js_1.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 (0, utils_js_1.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);
+}
+exports.pbkdf2Async = pbkdf2Async;
+//# sourceMappingURL=pbkdf2.js.map