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/performing-web-application-penetration-test/references/api-reference.md

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+# API Reference: Web Application Penetration Test Agent
+
+## Overview
+
+Performs automated web application security testing: technology fingerprinting, security header checks, HTTP method testing, CORS misconfiguration detection, basic SQL injection, and reflected XSS testing.
+
+## Dependencies
+
+| Package | Version | Purpose |
+|---------|---------|---------|
+| requests | >= 2.28 | HTTP client for all web tests |
+
+## External Tools (Optional)
+
+| Tool | Purpose |
+|------|---------|
+| ffuf | Directory and file brute-forcing |
+
+## Core Functions
+
+### `fingerprint_technology(target_url)`
+Identifies server, framework, and language from headers and cookie names.
+- **Returns**: `dict` with `server` and `technologies` list
+
+### `check_security_headers(target_url)`
+Checks HSTS, CSP, X-Content-Type-Options, X-Frame-Options, X-XSS-Protection, Referrer-Policy, Permissions-Policy.
+- **Returns**: `dict[str, dict]` - header to presence/value mapping
+
+### `test_http_methods(target_url)`
+Tests for dangerous HTTP methods (PUT, DELETE, TRACE, CONNECT).
+- **Returns**: `list[dict]` - allowed dangerous methods with risk levels
+
+### `test_cors_config(target_url)`
+Tests CORS with evil origins, null origin, and subdomain spoofing.
+- **Returns**: `list[dict]` - reflected origins with credential risks
+
+### `run_directory_bruteforce(target_url, wordlist)`
+Subprocess wrapper for ffuf directory enumeration.
+- **Default wordlist**: `/usr/share/seclists/Discovery/Web-Content/common.txt`
+
+### `test_sql_injection_basic(target_url, params)`
+Tests URL parameters with SQL injection payloads and checks for database error strings.
+- **Risk**: CRITICAL when SQL error patterns detected
+
+### `test_xss_basic(target_url, params)`
+Tests for reflected XSS by checking if payloads appear unescaped in response body.
+- **Risk**: HIGH when payload is reflected
+
+### `run_assessment(target_url, test_params)`
+Full assessment pipeline with summary statistics.
+
+## OWASP Test Coverage
+
+| OWASP Category | Tests Performed |
+|----------------|----------------|
+| A01 Broken Access Control | CORS, HTTP methods |
+| A03 Injection | SQL injection, XSS |
+| A05 Security Misconfiguration | Security headers, HTTP methods |
+
+## Usage
+
+```bash
+python agent.py https://target-app.example.com
+```