CRITICAL FIX: Guard unprotected header_score comparison at line 1815

Line 1815: Changed from [ "$header_score" -ge 8 ] to [ "${header_score:-0}" -ge 8 ]
- This was another unprotected array variable access in the threat scoring loop
- Missed in previous fix - now ALL array accesses in scoring loop are guarded

This ensures script continues past 'Calculating threat scores...' phase.

modules/security/bot-analyzer.sh

@@ -1812,7 +1812,7 @@ calculate_threat_scores() {
             header_score=${header_anomalies[$ip]:-0}
             if [ "${header_score:-0}" -ge 12 ]; then
                 score=$((score + 8))  # Multiple header suspicions
-            elif [ "$header_score" -ge 8 ]; then
+            elif [ "${header_score:-0}" -ge 8 ]; then
                 score=$((score + 5))  # Moderate header anomalies
             fi
         fi