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/conducting-api-security-testing/scripts/agent.py

@@ -5,6 +5,7 @@
 import json
 import logging
 import argparse
+from datetime import datetime
 from urllib.parse import urljoin
 
 import requests
@@ -184,7 +185,7 @@ def generate_report(findings):
     """Generate API security testing report."""
     critical = [f for f in findings if f.get("vulnerable")]
     report = {
-        "timestamp": __import__("datetime").datetime.utcnow().isoformat(),
+        "timestamp": datetime.utcnow().isoformat(),
         "total_tests": len(findings),
         "vulnerabilities_found": len(critical),
         "findings": findings,