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/@streamparser/json/test/keepStack.ts

@@ -0,0 +1,41 @@
+import JSONParser from "../src/jsonparser.js";
+import { runJSONParserTest } from "./utils/testRunner.js";
+
+describe("keepStack", () => {
+  const testData = [
+    {
+      value: '{ "a": { "b": 1, "c": 2, "d": 3, "e": 4 } }',
+      paths: ["$"],
+    },
+    {
+      value: '{ "a": { "b": 1, "c": 2, "d": 3, "e": 4 } }',
+      paths: ["$.a.*"],
+    },
+    {
+      value: '{ "a": { "b": 1, "c": 2, "d": 3, "e": 4 } }',
+      paths: ["$.a.e"],
+    },
+    {
+      value: '{ "a": { "b": [1,2,3,4,5,6] } }',
+      paths: ["$.a.b.*"],
+      expected: 6,
+    },
+    {
+      value: '[{ "a": 1 }, { "a": 2 }, { "a": 3 }]',
+      paths: ["$.*"],
+    },
+  ];
+
+  testData.forEach(({ value, paths }) => {
+    test(`should keep parent empty if keepStack === false (${value} - ${paths})`, async () => {
+      await runJSONParserTest(
+        new JSONParser({ paths, keepStack: false }),
+        [value],
+        ({ parent }) => {
+          if (parent === undefined) return;
+          expect(Object.keys(parent).length).toEqual(0);
+        },
+      );
+    });
+  });
+});