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-prefetch-files-for-execution-history/scripts/agent.py

@@ -4,7 +4,6 @@
 import struct
 import os
 import sys
-import hashlib
 import datetime
 import json
 import glob
@@ -164,11 +163,11 @@ def build_execution_timeline(prefetch_results):
 
 def run_pecmd(prefetch_path, output_dir=None):
     """Run Eric Zimmerman's PECmd for comprehensive prefetch parsing."""
-    cmd = f"PECmd.exe -f {prefetch_path}"
-    if output_dir:
-        cmd += f" --csv {output_dir}"
     import subprocess
-    result = subprocess.run(cmd, shell=True, capture_output=True, text=True, timeout=30)
+    cmd = ["PECmd.exe", "-f", prefetch_path]
+    if output_dir:
+        cmd += ["--csv", output_dir]
+    result = subprocess.run(cmd, capture_output=True, text=True, timeout=30)
     return result.stdout, result.returncode