Cache drive details to eliminate redundant smartctl calls

Add per-run cache for _get_drive_details() results. Each drive is
queried once via smartctl -i and the result is reused across SMART
health checks and ticket creation.

Resolves #15

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

hwmonDaemon.py

@@ -665,6 +665,9 @@ class SystemHealthMonitor:
         # Ensure history directory exists
         os.makedirs(self.CONFIG['HISTORY_DIR'], exist_ok=True)
 
+        # Drive details cache (per-run, cleared on next execution)
+        self._drive_details_cache = {}
+
     def _enforce_storage_limit(self, history_dir: str, max_bytes: int = None):
         """
         Delete oldest history files if directory exceeds size limit.
@@ -1072,7 +1075,10 @@ class SystemHealthMonitor:
     # DRIVE HEALTH CHECKING METHODS
     # =============================================================================
     def _get_drive_details(self, device: str) -> Dict[str, str]:
-        """Get detailed drive information using smartctl."""
+        """Get detailed drive information using smartctl (cached per run)."""
+        if device in self._drive_details_cache:
+            return self._drive_details_cache[device]
+
         drive_details = {
             'model': None,
             'serial': None,
@@ -1127,6 +1133,7 @@ class SystemHealthMonitor:
         except Exception as e:
             logger.debug(f"Error getting drive details for {device}: {e}")
 
+        self._drive_details_cache[device] = drive_details
         return drive_details