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/configuring-multi-factor-authentication-with-duo/SKILL.md

@@ -44,7 +44,7 @@ Deploy Cisco Duo multi-factor authentication across enterprise applications, VPN
 - **Device Health**: Block or require MFA based on OS patch level, encryption, firewall
 - **Risk-Based Authentication**: Step-up MFA for anomalous login patterns
 
-## Implementation Steps
+## Workflow
 
 ### Step 1: Duo Authentication Proxy Setup
 1. Deploy Duo Authentication Proxy on Windows/Linux server

skills/configuring-multi-factor-authentication-with-duo/scripts/agent.py

@@ -6,7 +6,6 @@ import sys
 import argparse
 import hmac
 import hashlib
-import time
 import email.utils
 import urllib.parse
 from datetime import datetime
@@ -41,7 +40,7 @@ class DuoAdminClient:
         params = params or {}
         headers = self._sign("GET", endpoint, params)
         resp = requests.get(f"https://{self.host}{endpoint}",
-                            headers=headers, params=params)
+                            headers=headers, params=params, timeout=30)
         resp.raise_for_status()
         return resp.json()