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-linux-system-artifacts/scripts/agent.py

@@ -4,15 +4,15 @@
 import os
 import sys
 import glob
-import json
-import re
-import datetime
+import shlex
 import subprocess
 
 
 def run_cmd(cmd):
-    """Execute a shell command and return output."""
-    result = subprocess.run(cmd, shell=True, capture_output=True, text=True, timeout=30)
+    """Execute a command and return output."""
+    if isinstance(cmd, str):
+        cmd = shlex.split(cmd)
+    result = subprocess.run(cmd, capture_output=True, text=True, timeout=30)
     return result.stdout.strip(), result.stderr.strip(), result.returncode
 
 
@@ -196,10 +196,12 @@ def check_ld_preload(evidence_root):
 
 def find_suid_binaries(evidence_root):
     """Find SUID/SGID binaries (potential privilege escalation)."""
-    stdout, _, rc = run_cmd(
-        f"find {evidence_root} -perm -4000 -type f 2>/dev/null"
+    result = subprocess.run(
+        ["find", evidence_root, "-perm", "-4000", "-type", "f"],
+        capture_output=True, text=True, timeout=30
     )
-    return stdout.splitlines() if rc == 0 and stdout else []
+    stdout = result.stdout.strip()
+    return stdout.splitlines() if result.returncode == 0 and stdout else []
 
 
 def find_suspicious_tmp_files(evidence_root):