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/src.ts/hash/message.ts

@@ -0,0 +1,51 @@
+import { keccak256 } from "../crypto/index.js";
+import { MessagePrefix } from "../constants/index.js";
+import { recoverAddress } from "../transaction/index.js";
+import { concat, toUtf8Bytes } from "../utils/index.js";
+
+import type { SignatureLike } from "../crypto/index.js";
+/**
+ *  Computes the [[link-eip-191]] personal-sign message digest to sign.
+ *
+ *  This prefixes the message with [[MessagePrefix]] and the decimal length
+ *  of %%message%% and computes the [[keccak256]] digest.
+ *
+ *  If %%message%% is a string, it is converted to its UTF-8 bytes
+ *  first. To compute the digest of a [[DataHexString]], it must be converted
+ *  to [bytes](getBytes).
+ *
+ *  @example:
+ *    hashMessage("Hello World")
+ *    //_result:
+ *
+ *    // Hashes the SIX (6) string characters, i.e.
+ *    // [ "0", "x", "4", "2", "4", "3" ]
+ *    hashMessage("0x4243")
+ *    //_result:
+ *
+ *    // Hashes the TWO (2) bytes [ 0x42, 0x43 ]...
+ *    hashMessage(getBytes("0x4243"))
+ *    //_result:
+ *
+ *    // ...which is equal to using data
+ *    hashMessage(new Uint8Array([ 0x42, 0x43 ]))
+ *    //_result:
+ *
+ */
+export function hashMessage(message: Uint8Array | string): string {
+    if (typeof(message) === "string") { message = toUtf8Bytes(message); }
+    return keccak256(concat([
+        toUtf8Bytes(MessagePrefix),
+        toUtf8Bytes(String(message.length)),
+        message
+    ]));
+}
+
+/**
+ *  Return the address of the private key that produced
+ *  the signature %%sig%% during signing for %%message%%.
+ */
+export function verifyMessage(message: Uint8Array | string, sig: SignatureLike): string {
+    const digest = hashMessage(message);
+    return recoverAddress(digest, sig);
+}