Add folder anatomy (scripts/agent.py + references/api-reference.md) for 648 cybersecurity skills

Complete skill folder anatomy across all cybersecurity skills:
- scripts/agent.py: 80-150 line Python agents using real libraries (impacket,
  boto3, azure-mgmt-*, kubernetes, pefile, yara, scapy, shodan, stix2, etc.)
- references/api-reference.md: real API documentation with method signatures
- LICENSE: MIT license for all skill folders

skills/conducting-man-in-the-middle-attack-simulation/references/api-reference.md

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+# API Reference: MITM Attack Simulation Agent
+
+## Overview
+
+Simulates man-in-the-middle attacks using Scapy for ARP spoofing, detects cleartext protocol usage, and checks HSTS enforcement. For authorized penetration testing and lab environments only.
+
+## Dependencies
+
+| Package | Version | Purpose |
+|---------|---------|---------|
+| scapy | >=2.5 | ARP spoofing, packet sniffing, host discovery |
+| requests | >=2.28 | HSTS and SSL stripping checks |
+
+## CLI Usage
+
+```bash
+# Host discovery and cleartext detection
+python agent.py --network 192.168.1.0/24 --interface eth0 --duration 60
+
+# Full MITM simulation
+python agent.py --target 192.168.1.100 --gateway 192.168.1.1 --interface eth0
+```
+
+## Key Functions
+
+### `get_mac(ip_address)`
+Resolves MAC address for a given IP using ARP request via Scapy.
+
+### `discover_hosts(network_cidr)`
+Discovers live hosts on a network segment using ARP broadcast scan.
+
+### `arp_spoof(target_ip, spoof_ip, target_mac)`
+Sends a spoofed ARP reply to redirect traffic through the attacker machine.
+
+### `arp_restore(target_ip, gateway_ip, target_mac, gateway_mac)`
+Restores original ARP tables by sending correct ARP replies after testing.
+
+### `detect_cleartext_protocols(interface, duration)`
+Sniffs network traffic for cleartext protocols: HTTP (80), FTP (21), Telnet (23), SMTP (25), POP3 (110), IMAP (143).
+
+### `check_hsts_enforcement(target_url)`
+Checks HTTP responses for Strict-Transport-Security headers.
+
+### `run_mitm_simulation(target_ip, gateway_ip, interface, duration)`
+Executes a controlled ARP spoofing MITM simulation with automatic ARP restoration on completion.
+
+## Scapy Functions Used
+
+| Function | Purpose |
+|----------|---------|
+| `ARP()` | Create ARP request/reply packets |
+| `Ether()` | Create Ethernet frames |
+| `srp()` | Send and receive layer 2 packets |
+| `send()` | Send packets at layer 3 |
+| `sniff()` | Capture network traffic |
+
+## Cleartext Protocols Detected
+
+| Port | Protocol | Risk |
+|------|----------|------|
+| 80 | HTTP | Credential interception |
+| 21 | FTP | Cleartext authentication |
+| 23 | Telnet | Full session hijacking |
+| 25 | SMTP | Email interception |
+| 110 | POP3 | Email credential theft |
+| 143 | IMAP | Email credential theft |