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/ethers/lib.esm/wallet/mnemonic.d.ts

@@ -0,0 +1,65 @@
+import type { BytesLike } from "../utils/index.js";
+import type { Wordlist } from "../wordlists/index.js";
+/**
+ *  A **Mnemonic** wraps all properties required to compute [[link-bip-39]]
+ *  seeds and convert between phrases and entropy.
+ */
+export declare class Mnemonic {
+    /**
+     *  The mnemonic phrase of 12, 15, 18, 21 or 24 words.
+     *
+     *  Use the [[wordlist]] ``split`` method to get the individual words.
+     */
+    readonly phrase: string;
+    /**
+     *  The password used for this mnemonic. If no password is used this
+     *  is the empty string (i.e. ``""``) as per the specification.
+     */
+    readonly password: string;
+    /**
+     *  The wordlist for this mnemonic.
+     */
+    readonly wordlist: Wordlist;
+    /**
+     *  The underlying entropy which the mnemonic encodes.
+     */
+    readonly entropy: string;
+    /**
+     *  @private
+     */
+    constructor(guard: any, entropy: string, phrase: string, password?: null | string, wordlist?: null | Wordlist);
+    /**
+     *  Returns the seed for the mnemonic.
+     */
+    computeSeed(): string;
+    /**
+     *  Creates a new Mnemonic for the %%phrase%%.
+     *
+     *  The default %%password%% is the empty string and the default
+     *  wordlist is the [English wordlists](LangEn).
+     */
+    static fromPhrase(phrase: string, password?: null | string, wordlist?: null | Wordlist): Mnemonic;
+    /**
+     *  Create a new **Mnemonic** from the %%entropy%%.
+     *
+     *  The default %%password%% is the empty string and the default
+     *  wordlist is the [English wordlists](LangEn).
+     */
+    static fromEntropy(_entropy: BytesLike, password?: null | string, wordlist?: null | Wordlist): Mnemonic;
+    /**
+     *  Returns the phrase for %%mnemonic%%.
+     */
+    static entropyToPhrase(_entropy: BytesLike, wordlist?: null | Wordlist): string;
+    /**
+     *  Returns the entropy for %%phrase%%.
+     */
+    static phraseToEntropy(phrase: string, wordlist?: null | Wordlist): string;
+    /**
+     *  Returns true if %%phrase%% is a valid [[link-bip-39]] phrase.
+     *
+     *  This checks all the provided words belong to the %%wordlist%%,
+     *  that the length is valid and the checksum is correct.
+     */
+    static isValidMnemonic(phrase: string, wordlist?: null | Wordlist): boolean;
+}
+//# sourceMappingURL=mnemonic.d.ts.map