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/_u64.d.ts

@@ -0,0 +1,54 @@
+declare function fromBig(n: bigint, le?: boolean): {
+    h: number;
+    l: number;
+};
+declare function split(lst: bigint[], le?: boolean): Uint32Array[];
+declare const toBig: (h: number, l: number) => bigint;
+declare const shrSH: (h: number, _l: number, s: number) => number;
+declare const shrSL: (h: number, l: number, s: number) => number;
+declare const rotrSH: (h: number, l: number, s: number) => number;
+declare const rotrSL: (h: number, l: number, s: number) => number;
+declare const rotrBH: (h: number, l: number, s: number) => number;
+declare const rotrBL: (h: number, l: number, s: number) => number;
+declare const rotr32H: (_h: number, l: number) => number;
+declare const rotr32L: (h: number, _l: number) => number;
+declare const rotlSH: (h: number, l: number, s: number) => number;
+declare const rotlSL: (h: number, l: number, s: number) => number;
+declare const rotlBH: (h: number, l: number, s: number) => number;
+declare const rotlBL: (h: number, l: number, s: number) => number;
+declare function add(Ah: number, Al: number, Bh: number, Bl: number): {
+    h: number;
+    l: number;
+};
+declare const add3L: (Al: number, Bl: number, Cl: number) => number;
+declare const add3H: (low: number, Ah: number, Bh: number, Ch: number) => number;
+declare const add4L: (Al: number, Bl: number, Cl: number, Dl: number) => number;
+declare const add4H: (low: number, Ah: number, Bh: number, Ch: number, Dh: number) => number;
+declare const add5L: (Al: number, Bl: number, Cl: number, Dl: number, El: number) => number;
+declare const add5H: (low: number, Ah: number, Bh: number, Ch: number, Dh: number, Eh: number) => number;
+export { fromBig, split, toBig, shrSH, shrSL, rotrSH, rotrSL, rotrBH, rotrBL, rotr32H, rotr32L, rotlSH, rotlSL, rotlBH, rotlBL, add, add3L, add3H, add4L, add4H, add5H, add5L, };
+declare const u64: {
+    fromBig: typeof fromBig;
+    split: typeof split;
+    toBig: (h: number, l: number) => bigint;
+    shrSH: (h: number, _l: number, s: number) => number;
+    shrSL: (h: number, l: number, s: number) => number;
+    rotrSH: (h: number, l: number, s: number) => number;
+    rotrSL: (h: number, l: number, s: number) => number;
+    rotrBH: (h: number, l: number, s: number) => number;
+    rotrBL: (h: number, l: number, s: number) => number;
+    rotr32H: (_h: number, l: number) => number;
+    rotr32L: (h: number, _l: number) => number;
+    rotlSH: (h: number, l: number, s: number) => number;
+    rotlSL: (h: number, l: number, s: number) => number;
+    rotlBH: (h: number, l: number, s: number) => number;
+    rotlBL: (h: number, l: number, s: number) => number;
+    add: typeof add;
+    add3L: (Al: number, Bl: number, Cl: number) => number;
+    add3H: (low: number, Ah: number, Bh: number, Ch: number) => number;
+    add4L: (Al: number, Bl: number, Cl: number, Dl: number) => number;
+    add4H: (low: number, Ah: number, Bh: number, Ch: number, Dh: number) => number;
+    add5H: (low: number, Ah: number, Bh: number, Ch: number, Dh: number, Eh: number) => number;
+    add5L: (Al: number, Bl: number, Cl: number, Dl: number, El: number) => number;
+};
+export default u64;