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-phishing-incident-response/references/api-reference.md

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+# API Reference: Phishing Incident Response Agent
+
+## Overview
+
+Analyzes phishing emails: parses EML files, extracts URLs and attachment hashes, checks reputation via VirusTotal and urlscan.io, assesses SPF/DKIM/DMARC authentication, and generates severity-rated IR reports.
+
+## Dependencies
+
+| Package | Version | Purpose |
+|---------|---------|---------|
+| requests | >=2.28 | VirusTotal and urlscan.io API calls |
+
+## CLI Usage
+
+```bash
+python agent.py --eml suspicious_email.eml --vt-key <key> --output report.json
+```
+
+## Key Functions
+
+### `parse_email_file(eml_path)`
+Parses EML file extracting Subject, From, To, Received headers, and SPF/DKIM/DMARC authentication results.
+
+### `extract_urls(msg)`
+Extracts all URLs from email body (plain text and HTML parts) using regex.
+
+### `extract_attachments(msg)`
+Extracts attachment filenames, content types, sizes, and computes SHA-256/MD5 hashes.
+
+### `check_url_virustotal(url, api_key)`
+Checks URL reputation on VirusTotal v3 API (malicious, suspicious, harmless counts).
+
+### `check_url_urlscan(url)`
+Submits URL to urlscan.io for visual and behavioral analysis.
+
+### `check_hash_virustotal(file_hash, api_key)`
+Checks attachment hash reputation on VirusTotal for malware detection.
+
+### `assess_phishing_severity(parsed_email, url_results, attachment_results)`
+Rates phishing severity (Low/Medium/Critical) based on auth failures and malicious content.
+
+## External APIs Used
+
+| API | Endpoint | Auth | Purpose |
+|-----|----------|------|---------|
+| VirusTotal v3 | `/api/v3/urls/{id}` | API key | URL reputation |
+| VirusTotal v3 | `/api/v3/files/{hash}` | API key | File hash reputation |
+| urlscan.io | `/api/v1/scan/` | None | URL visual analysis |
+
+## Email Authentication Checks
+
+| Check | Pass | Fail | Impact |
+|-------|------|------|--------|
+| SPF | Sender IP authorized | Possible spoofing | Severity +1 |
+| DKIM | Signature valid | Message may be tampered | Severity +1 |
+| DMARC | Policy enforced | SPF+DKIM alignment failed | Severity +1 |