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-web-cache-deception-attack/scripts/agent.py

@@ -1,12 +1,16 @@
 #!/usr/bin/env python3
+# For authorized penetration testing and educational environments only.
+# Usage against targets without prior mutual consent is illegal.
+# It is the end user's responsibility to obey all applicable local, state and federal laws.
 """Agent for testing web cache deception vulnerabilities.
 
 Appends static file extensions to authenticated URLs to test
 whether CDN/proxy caches serve personalized content to other users.
 """
 
-import requests
 import json
+import os
+import requests
 import sys
 from datetime import datetime
 
@@ -120,7 +124,7 @@ class WebCacheDeceptionAgent:
 
 
 def main():
-    url = sys.argv[1] if len(sys.argv) > 1 else "http://localhost:8080"
+    url = sys.argv[1] if len(sys.argv) > 1 else os.environ.get("TARGET_URL", "http://localhost:8080")
     path = sys.argv[2] if len(sys.argv) > 2 else "/account"
     cookie = sys.argv[3] if len(sys.argv) > 3 else None
     agent = WebCacheDeceptionAgent(url, auth_cookie=cookie)