Production hardening: security fixes, code quality, 724 skills complete

- Fix 25 shell=True subprocess calls with list-based commands
- Fix 49 verify=False in defensive skills (env-var override)
- Add timeout to 231 HTTP/subprocess/socket calls
- Fix 6 SQL injection patterns with whitelist validation
- Replace 8 __import__() with standard imports
- Remove 701 unused imports across 442 files
- Add authorized-testing disclaimers to all offensive skills
- Complete 11 incomplete skill directories
- Expand 10 stub SKILL.md files with full content
- Fix 2 YAML parse errors in frontmatter
- Fix 5 pre-existing syntax errors
- Convert 22 hardcoded paths/ports to environment variables
- Back up 21 redundant skill pairs to .bak
- Fix 2 global declaration errors
- 724/724 skills with full folder anatomy (SKILL.md + agent.py + api-reference.md + LICENSE)
- 0 compile errors across all 724 agent.py files

skills/performing-user-behavior-analytics/scripts/agent.py

@@ -1,10 +1,10 @@
 #!/usr/bin/env python3
 """User Behavior Analytics (UEBA) agent using elasticsearch-py."""
 
-import sys
-import json
 import math
-from datetime import datetime, timedelta
+import os
+import sys
+from datetime import datetime
 
 try:
     from elasticsearch import Elasticsearch
@@ -16,7 +16,8 @@ except ImportError:
 EARTH_RADIUS_KM = 6371
 
 
-def get_es_client(host="https://localhost:9200", api_key=None):
+def get_es_client(host=None, api_key=None):
+    host = host or os.environ.get("ES_HOSTS", "https://localhost:9200")
     kwargs = {"hosts": [host], "verify_certs": False}
     if api_key:
         kwargs["api_key"] = api_key
@@ -209,7 +210,7 @@ def print_report(travel_alerts, offhours_alerts, risk_scores):
 
 
 if __name__ == "__main__":
-    host = sys.argv[1] if len(sys.argv) > 1 else "https://localhost:9200"
+    host = sys.argv[1] if len(sys.argv) > 1 else os.environ.get("ES_HOSTS", "https://localhost:9200")
     es = get_es_client(host)
     baselines = build_user_baselines(es)
     travel = detect_impossible_travel(es)