style: clear whitespace, unused-import and blank-line lint

Strip trailing whitespace, drop unused imports/variables/global statements,
split multi-imports, fix E3xx/E1xx spacing and E712 comparisons. No behaviour
change; only E501 long lines remain in flake8.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

hbd/server/main.py

@@ -5,8 +5,6 @@ import logging
 import socket
 import time
 import signal
-import sys
-import ssl
 from . import __version__
 
 from . import udp
@@ -23,6 +21,7 @@ eventlog = notify_mod.eventlog
 
 # shared runtime collections and helpers
 
+
 def save_state(config, hbdclass):
     """Save current state to pickle file. Safe to call at any time."""
     import pickle
@@ -68,21 +67,21 @@ def cleanup_function(config, hbdclass):
 
 async def reload_configuration(config_obj, config_path, components):
     """Reload configuration and update all components.
-    
+
     Args:
         config_obj: ReloadableConfig instance
         config_path: Path to config file
         components: Dict with threshold_checker and other components
-        
+
     Returns:
         True if reload succeeded, False otherwise
     """
     try:
         logger.info("Starting configuration reload...")
-        
+
         # Reload config file
         new_config = await config_obj.reload(config_path)
-        
+
         # Update notify module
         notify_mod.reload_config(new_config)
 
@@ -103,23 +102,23 @@ async def reload_configuration(config_obj, config_path, components):
         if 'threshold_checker' in components:
             components['threshold_checker'].reload(new_config)
             components['threshold_checker'].purge_stale_alerts(hbdclass)
-        
+
         # Note: Changes to the following require restart:
         # - hb_port, hbd_port, ws_port (already bound)
         # - SSL certificates (already loaded)
         # - pickfile (already opened)
         # - journal settings (journal already initialized)
-        
+
         # These are reloadable and effective immediately:
         # - notification_channels
         # - threshold_configs
         # - hosts (watchhosts, dyndns, notification_channels)
         # - grace period (used on next heartbeat)
         # - debug/verbose flags (used on next message)
-        
+
         logger.info("Configuration reload completed successfully")
         return True
-        
+
     except Exception as e:
         logger.error("=" * 60)
         logger.error(f"Failed to reload configuration: {e}", exc_info=True)
@@ -142,7 +141,7 @@ async def _run_async(config, config_path=None):
         sig_name = signal.Signals(signum).name if hasattr(signal, "Signals") else signum
         logger.info(f"Received {sig_name}, initiating shutdown...")
         loop.call_soon_threadsafe(shutdown_event.set)
-    
+
     def reload_handler(signum, frame):
         sig_name = signal.Signals(signum).name if hasattr(signal, "Signals") else signum
         logger.info(f"Received {sig_name}, initiating config reload...")
@@ -181,7 +180,7 @@ async def _run_async(config, config_path=None):
         journal=msg_journal,
     )
     logger.info("Threshold checker initialized")
-    
+
     # Components dict for reload orchestration
     components = {
         'threshold_checker': threshold_checker,
@@ -324,7 +323,7 @@ async def _run_async(config, config_path=None):
                 ],
                 return_when=asyncio.FIRST_COMPLETED
             )
-            
+
             # Check which event was triggered
             if shutdown_event.is_set():
                 logger.info("Shutdown signal received, stopping services...")
@@ -332,24 +331,24 @@ async def _run_async(config, config_path=None):
                 for task in pending:
                     task.cancel()
                 break
-            
+
             if reload_event.is_set():
                 # Clear the event for next reload
                 reload_event.clear()
-                
+
                 # Cancel pending wait tasks
                 for task in pending:
                     task.cancel()
-                
+
                 # Perform reload if config_path is available
                 if config_path:
                     await reload_configuration(config, config_path, components)
                 else:
                     logger.warning("Cannot reload: no config path available")
-                
+
                 # Continue main loop
                 continue
-                
+
     except Exception as e:
         logger.exception("Error in main loop: %s", e)
     finally:
@@ -381,7 +380,7 @@ async def _run_async(config, config_path=None):
                 logger.warning("Timeout waiting for tasks to cancel")
             except Exception as e:
                 logger.debug("Exception during task cancellation: %s", e)
-        
+
         # Close message journal
         try:
             await msg_journal.close()
@@ -487,7 +486,7 @@ def run(config, config_path=None):
     """Start the hbd service (blocking).
 
     Manually manages the event loop to ensure clean shutdown.
-    
+
     Args:
         config: Configuration dictionary
         config_path: Path to config file (for reload support)