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/hardening-linux-endpoint-with-cis-benchmark/scripts/agent.py

@@ -5,16 +5,21 @@ import argparse
 import json
 import os
 import re
+import shlex
 import subprocess
-import sys
 from datetime import datetime, timezone
 
 
 def run_cmd(cmd, timeout=10):
-    """Run a shell command and return stdout."""
+    """Run a command and return stdout."""
     try:
+        # Strip shell stderr redirects since we use subprocess.DEVNULL
+        clean_cmd = cmd.replace("2>/dev/null", "").strip()
+        # Use shell only for commands with shell operators
+        needs_shell = any(op in clean_cmd for op in ("|", ";", "&&", "||"))
         return subprocess.check_output(
-            cmd, shell=True, text=True, errors="replace",
+            clean_cmd if needs_shell else shlex.split(clean_cmd),
+            shell=needs_shell, text=True, errors="replace",
             timeout=timeout, stderr=subprocess.DEVNULL
         ).strip()
     except subprocess.SubprocessError: