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/cli_env/lib64/python3.13/site-packages/dotenv/ipython.py

@@ -0,0 +1,50 @@
+from IPython.core.magic import Magics, line_magic, magics_class  # type: ignore
+from IPython.core.magic_arguments import (
+    argument,
+    magic_arguments,
+    parse_argstring,
+)  # type: ignore
+
+from .main import find_dotenv, load_dotenv
+
+
+@magics_class
+class IPythonDotEnv(Magics):
+    @magic_arguments()
+    @argument(
+        "-o",
+        "--override",
+        action="store_true",
+        help="Indicate to override existing variables",
+    )
+    @argument(
+        "-v",
+        "--verbose",
+        action="store_true",
+        help="Indicate function calls to be verbose",
+    )
+    @argument(
+        "dotenv_path",
+        nargs="?",
+        type=str,
+        default=".env",
+        help="Search in increasingly higher folders for the `dotenv_path`",
+    )
+    @line_magic
+    def dotenv(self, line):
+        args = parse_argstring(self.dotenv, line)
+        # Locate the .env file
+        dotenv_path = args.dotenv_path
+        try:
+            dotenv_path = find_dotenv(dotenv_path, True, True)
+        except IOError:
+            print("cannot find .env file")
+            return
+
+        # Load the .env file
+        load_dotenv(dotenv_path, verbose=args.verbose, override=args.override)
+
+
+def load_ipython_extension(ipython):
+    """Register the %dotenv magic."""
+    ipython.register_magics(IPythonDotEnv)