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/client/plugins/memory_monitor.py

@@ -32,31 +32,32 @@ def _zfs_arc_bytes() -> int:
         pass
     return 0
 
+
 logger = logging.getLogger(__name__)
 
 
 class MemoryMonitorPlugin(MonitorPlugin):
     """
     Monitor memory and swap usage.
-    
+
     Collects:
     - Physical memory (RAM) usage and statistics
     - Virtual memory details
     - Swap memory usage and statistics
     - Memory available for applications
-    
+
     Configuration:
         interval: Collection interval in seconds (default: 300)
         include_swap: Include swap statistics (default: True)
     """
-    
+
     name = "memory_monitor"
     interval = 300  # Collect every 5 minutes by default
-    
+
     def __init__(self, config: Optional[Dict[str, Any]] = None):
         """
         Initialize the memory monitor plugin.
-        
+
         Args:
             config: Optional configuration dict with keys:
                    - interval: Collection interval in seconds (default: 300)
@@ -65,23 +66,23 @@ class MemoryMonitorPlugin(MonitorPlugin):
         super().__init__(config)
         self.include_swap = self.config.get('include_swap', True)
         self.interval = self.config.get('interval', 300)
-        
+
         if psutil is None:
             raise ImportError("psutil library is required for memory_monitor plugin")
-    
+
     async def initialize(self):
         """Initialize the plugin (check psutil availability)."""
         if psutil is None:
             logger.error("psutil not available - memory_monitor cannot run")
             return False
-        
+
         logger.info(f"Memory monitor initialized (interval: {self.interval}s, swap: {self.include_swap})")
         return True
-    
+
     async def collect(self) -> Dict[str, Any]:
         """
         Collect current memory statistics.
-        
+
         Returns:
             Dictionary with memory metrics:
             - memory_total: Total physical RAM in bytes
@@ -104,7 +105,7 @@ class MemoryMonitorPlugin(MonitorPlugin):
         if psutil is None:
             logger.error("psutil not available")
             return {}
-        
+
         try:
             data = await self._collect_metrics()
             logger.debug(f"Collected memory metrics: {len(data)} fields")
@@ -112,11 +113,11 @@ class MemoryMonitorPlugin(MonitorPlugin):
         except Exception as e:
             logger.error(f"Error collecting memory metrics: {e}")
             return {"error": str(e)}
-    
+
     async def _collect_metrics(self) -> Dict[str, Any]:
         """Collect memory metrics from psutil."""
         metrics = {}
-        
+
         # Virtual (physical) memory statistics
         vmem = psutil.virtual_memory()
 
@@ -134,7 +135,7 @@ class MemoryMonitorPlugin(MonitorPlugin):
         metrics['memory_used'] = used
         metrics['memory_free'] = vmem.free
         metrics['memory_percent'] = percent
-        
+
         # Platform-specific memory details
         if hasattr(vmem, 'active'):
             metrics['memory_active'] = vmem.active
@@ -146,7 +147,7 @@ class MemoryMonitorPlugin(MonitorPlugin):
             metrics['memory_cached'] = vmem.cached
         if hasattr(vmem, 'shared'):
             metrics['memory_shared'] = vmem.shared
-        
+
         # Swap memory statistics
         if self.include_swap:
             try:
@@ -155,7 +156,7 @@ class MemoryMonitorPlugin(MonitorPlugin):
                 metrics['swap_used'] = swap.used
                 metrics['swap_free'] = swap.free
                 metrics['swap_percent'] = swap.percent
-                
+
                 # Swap in/out counters (may not be available on all platforms)
                 if hasattr(swap, 'sin'):
                     metrics['swap_sin'] = swap.sin
@@ -163,9 +164,9 @@ class MemoryMonitorPlugin(MonitorPlugin):
                     metrics['swap_sout'] = swap.sout
             except Exception as e:
                 logger.warning(f"Could not collect swap statistics: {e}")
-        
+
         return metrics
-    
+
     async def cleanup(self):
         """Cleanup (nothing to do for this plugin)."""
         logger.info("Memory monitor cleanup")