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/eskdf.d.ts

@@ -0,0 +1,46 @@
+export declare function scrypt(password: string, salt: string): Uint8Array;
+export declare function pbkdf2(password: string, salt: string): Uint8Array;
+/**
+ * Derives main seed. Takes a lot of time. Prefer `eskdf` method instead.
+ */
+export declare function deriveMainSeed(username: string, password: string): Uint8Array;
+type AccountID = number | string;
+type OptsLength = {
+    keyLength: number;
+};
+type OptsMod = {
+    modulus: bigint;
+};
+type KeyOpts = undefined | OptsLength | OptsMod;
+type ESKDF = Promise<Readonly<{
+    /**
+     * Derives a child key. Child key will not be associated with any
+     * other child key because of properties of underlying KDF.
+     *
+     * @param protocol - 3-15 character protocol name
+     * @param accountId - numeric identifier of account
+     * @param options - `keyLength: 64` or `modulus: 41920438n`
+     * @example deriveChildKey('aes', 0)
+     */
+    deriveChildKey: (protocol: string, accountId: AccountID, options?: KeyOpts) => Uint8Array;
+    /**
+     * Deletes the main seed from eskdf instance
+     */
+    expire: () => void;
+    /**
+     * Account fingerprint
+     */
+    fingerprint: string;
+}>>;
+/**
+ * ESKDF
+ * @param username - username, email, or identifier, min: 8 characters, should have enough entropy
+ * @param password - password, min: 8 characters, should have enough entropy
+ * @example
+ * const kdf = await eskdf('example-university', 'beginning-new-example');
+ * const key = kdf.deriveChildKey('aes', 0);
+ * console.log(kdf.fingerprint);
+ * kdf.expire();
+ */
+export declare function eskdf(username: string, password: string): ESKDF;
+export {};