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-oauth2-authorization-flow/SKILL.md

@@ -42,7 +42,7 @@ PKCE (RFC 7636) prevents authorization code interception attacks:
 - **Refresh Token**: Long-lived, single-use with rotation
 - **ID Token (OIDC)**: JWT containing user identity claims
 
-## Implementation Steps
+## Workflow
 
 ### Step 1: Authorization Code Flow with PKCE
 1. Generate cryptographically random code_verifier (min 43 chars)

skills/configuring-oauth2-authorization-flow/scripts/agent.py

@@ -4,7 +4,6 @@
 import json
 import sys
 import argparse
-import urllib.parse
 from datetime import datetime
 
 try: