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/crypto/sha2.ts

@@ -0,0 +1,78 @@
+import { createHash } from "./crypto.js";
+
+import { getBytes, hexlify } from "../utils/index.js";
+
+import type { BytesLike } from "../utils/index.js";
+
+
+const _sha256 = function(data: Uint8Array): Uint8Array {
+    return createHash("sha256").update(data).digest();
+}
+
+const _sha512 = function(data: Uint8Array): Uint8Array {
+    return createHash("sha512").update(data).digest();
+}
+
+let __sha256: (data: Uint8Array) => BytesLike = _sha256;
+let __sha512: (data: Uint8Array) => BytesLike = _sha512;
+
+let locked256 = false, locked512 = false;
+
+
+/**
+ *  Compute the cryptographic SHA2-256 hash of %%data%%.
+ *
+ *  @_docloc: api/crypto:Hash Functions
+ *  @returns DataHexstring
+ *
+ *  @example:
+ *    sha256("0x")
+ *    //_result:
+ *
+ *    sha256("0x1337")
+ *    //_result:
+ *
+ *    sha256(new Uint8Array([ 0x13, 0x37 ]))
+ *    //_result:
+ *
+ */
+export function sha256(_data: BytesLike): string {
+    const data = getBytes(_data, "data");
+    return hexlify(__sha256(data));
+}
+sha256._ = _sha256;
+sha256.lock = function(): void { locked256 = true; }
+sha256.register = function(func: (data: Uint8Array) => BytesLike): void {
+    if (locked256) { throw new Error("sha256 is locked"); }
+    __sha256 = func;
+}
+Object.freeze(sha256);
+
+
+/**
+ *  Compute the cryptographic SHA2-512 hash of %%data%%.
+ *
+ *  @_docloc: api/crypto:Hash Functions
+ *  @returns DataHexstring
+ *
+ *  @example:
+ *    sha512("0x")
+ *    //_result:
+ *
+ *    sha512("0x1337")
+ *    //_result:
+ *
+ *    sha512(new Uint8Array([ 0x13, 0x37 ]))
+ *    //_result:
+ */
+export function sha512(_data: BytesLike): string {
+    const data = getBytes(_data, "data");
+    return hexlify(__sha512(data));
+}
+sha512._ = _sha512;
+sha512.lock = function(): void { locked512 = true; }
+sha512.register = function(func: (data: Uint8Array) => BytesLike): void {
+    if (locked512) { throw new Error("sha512 is locked"); }
+    __sha512 = func;
+}
+Object.freeze(sha256);