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/building-vulnerability-scanning-workflow/SKILL.md

@@ -78,7 +78,8 @@ policy = {
     }
 }
 
-response = requests.post(f"{nessus_url}/scans", headers=headers, json=policy, verify=False)
+response = requests.post(f"{nessus_url}/scans", headers=headers, json=policy,
+                         verify=not os.environ.get("SKIP_TLS_VERIFY", "").lower() == "true")  # Set SKIP_TLS_VERIFY=true for self-signed certs in lab environments
 scan_id = response.json()["scan"]["id"]
 print(f"Scan created: ID {scan_id}")
 ```
@@ -120,7 +121,7 @@ response = requests.get(
     f"{nessus_url}/scans/{scan_id}/export",
     headers=headers,
     params={"format": "csv"},
-    verify=False
+    verify=not os.environ.get("SKIP_TLS_VERIFY", "").lower() == "true",  # Set SKIP_TLS_VERIFY=true for self-signed certs in lab environments
 )
 
 # Parse and prioritize