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/authorization.ts

@@ -0,0 +1,38 @@
+import { getAddress } from "../address/index.js";
+import { keccak256 } from "../crypto/index.js";
+import { recoverAddress } from "../transaction/index.js";
+import {
+    assertArgument, concat, encodeRlp, toBeArray
+} from "../utils/index.js";
+
+import type { Addressable } from "../address/index.js";
+import type { SignatureLike } from "../crypto/index.js";
+import type { BigNumberish, Numeric } from "../utils/index.js";
+
+export interface AuthorizationRequest {
+    address: string | Addressable;
+    nonce?: Numeric;
+    chainId?: BigNumberish;
+}
+
+/**
+ *  Computes the [[link-eip-7702]] authorization digest to sign.
+ */
+export function hashAuthorization(auth: AuthorizationRequest): string {
+    assertArgument(typeof(auth.address) === "string", "invalid address for hashAuthorization", "auth.address", auth);
+    return keccak256(concat([
+        "0x05", encodeRlp([
+            (auth.chainId != null) ? toBeArray(auth.chainId): "0x",
+            getAddress(auth.address),
+            (auth.nonce != null) ? toBeArray(auth.nonce): "0x",
+        ])
+    ]));
+}
+
+/**
+ *  Return the address of the private key that produced
+ *  the signature %%sig%% during signing for %%message%%.
+ */
+export function verifyAuthorization(auth: AuthorizationRequest, sig: SignatureLike): string {
+    return recoverAddress(hashAuthorization(auth), sig);
+}