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/cache/.vscode/launch.json

@@ -0,0 +1,61 @@
+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Debug Python Tests",
+            "type": "debugpy",
+            "request": "launch",
+            "program": "${workspaceFolder}/.venv/bin/pytest",
+            "args": [
+                "${input:testPath}",
+                "--no-cov",
+                "-vv"
+            ],
+            "console": "integratedTerminal",
+            "justMyCode": false,
+            "env": {
+                "PYTHONPATH": "${workspaceFolder}"
+            }
+        },
+        {
+            "name": "Debug All Tests",
+            "type": "debugpy",
+            "request": "launch",
+            "program": "${workspaceFolder}/.venv/bin/pytest",
+            "args": [
+                "tests/",
+                "--no-cov",
+                "-vv"
+            ],
+            "console": "integratedTerminal",
+            "justMyCode": false,
+            "env": {
+                "PYTHONPATH": "${workspaceFolder}"
+            }
+        },
+        {
+            "name": "Debug Current Test File",
+            "type": "debugpy",
+            "request": "launch",
+            "program": "${workspaceFolder}/.venv/bin/pytest",
+            "args": [
+                "${file}",
+                "--no-cov",
+                "-vv"
+            ],
+            "console": "integratedTerminal",
+            "justMyCode": false,
+            "env": {
+                "PYTHONPATH": "${workspaceFolder}"
+            }
+        }
+    ],
+    "inputs": [
+        {
+            "id": "testPath",
+            "description": "Test path or pattern",
+            "default": "tests/",
+            "type": "promptString"
+        }
+    ]
+}