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-threat-intelligence-feeds/scripts/agent.py

@@ -4,11 +4,10 @@
 import os
 import json
 import argparse
-from datetime import datetime, timedelta
+from datetime import datetime, timedelta, timezone
 
 from taxii2client.v21 import Server, Collection, as_pages
-from stix2 import Filter, MemoryStore, Indicator, Relationship, Bundle
-from stix2 import ThreatActor, Malware
+from stix2 import Indicator, Bundle
 
 
 def discover_taxii_server(url, user=None, password=None):
@@ -95,7 +94,7 @@ def score_feed_quality(indicators, known_good_iocs=None):
         1 for i in indicators
         if i.get("valid_from") and
         datetime.fromisoformat(i["valid_from"].replace("Z", "+00:00"))
-        > datetime.now(tz=__import__("datetime").timezone.utc) - timedelta(days=90)
+        > datetime.now(tz=timezone.utc) - timedelta(days=90)
     )
     score = int(
         (with_confidence / total * 25) +