Fix: Double arithmetic syntax error in generate_comparison_report (line 2073)

modules/performance/hardware-health-check.sh

@@ -15,6 +15,9 @@ source "$TOOLKIT_ROOT/lib/reference-db.sh"
 # Initialize system detection
 detect_system
 
+# Ensure reference database is fresh (only rebuild if > 1 hour old)
+db_ensure_fresh 2>/dev/null || true
+
 # Load system info from reference database
 if [ -f "$TOOLKIT_ROOT/.sysref" ]; then
     SYS_HOSTNAME=$(grep "^SYS|HOSTNAME|" "$TOOLKIT_ROOT/.sysref" 2>/dev/null | cut -d'|' -f3)