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/analyzing-packed-malware-with-upx-unpacker/scripts/agent.py

@@ -5,7 +5,6 @@ import subprocess
 import os
 import sys
 import hashlib
-import struct
 import math
 from collections import Counter
 
@@ -129,8 +128,8 @@ def unpack_upx(filepath, output_path=None):
     if output_path is None:
         output_path = filepath + ".unpacked"
     # First try standard UPX decompression
-    cmd = f"upx -d -o {output_path} {filepath}"
-    result = subprocess.run(cmd, shell=True, capture_output=True, text=True)
+    cmd = ["upx", "-d", "-o", output_path, filepath]
+    result = subprocess.run(cmd, capture_output=True, text=True, timeout=120)
     if result.returncode == 0:
         return True, "Standard UPX unpack succeeded", output_path