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/exploiting-ipv6-vulnerabilities/scripts/agent.py

@@ -6,14 +6,12 @@ import argparse
 import json
 import logging
 import sys
-import socket
-import struct
 from datetime import datetime
 from typing import List
 
 try:
     from scapy.all import (
-        sniff, sendp, get_if_hwaddr, get_if_addr6, conf,
+        sniff, sendp, sr, get_if_hwaddr, get_if_addr6, conf,
         Ether, IPv6, ICMPv6ND_RA, ICMPv6ND_NA, ICMPv6ND_NS,
         ICMPv6NDOptSrcLLAddr, ICMPv6NDOptPrefixInfo, ICMPv6NDOptRDNSS,
         ICMPv6NDOptDstLLAddr,
@@ -34,7 +32,7 @@ def discover_ipv6_hosts(interface: str, timeout: int = 5) -> List[dict]:
 
     replies = []
     try:
-        ans, _ = __import__("scapy.all", fromlist=["sr"]).sr(
+        ans, _ = sr(
             pkt, iface=interface, timeout=timeout, verbose=0, multi=True
         )
         for sent, recv in ans: