fix(gateway): add missing logger definition to prevent NameError in _all_platforms

hermes_cli/gateway.py:3702 referenced logger.debug() but 'logger' was
never defined in the module, causing a NameError at runtime if the
try/except around discover_plugins() caught an exception.

Added import logging and logger = logging.getLogger(__name__)
at module level to resolve the undefined name.

hermes_cli/gateway.py

@@ -5,6 +5,7 @@ Handles: hermes gateway [run|start|stop|restart|status|install|uninstall|setup]
 """
 
 import asyncio
+import logging
 import os
 import shutil
 import signal
@@ -38,6 +39,7 @@ from hermes_cli.setup import (
 )
 from hermes_cli.colors import Colors, color
 
+logger = logging.getLogger(__name__)
 
 # =============================================================================
 # Process Management (for manual gateway runs)