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/executing-phishing-simulation-campaign/references/api-reference.md

@@ -0,0 +1,55 @@
+# API Reference: Phishing Simulation Campaign Agent
+
+## Dependencies
+
+| Library | Version | Purpose |
+|---------|---------|---------|
+| requests | >=2.28 | HTTP client for GoPhish REST API |
+
+## CLI Usage
+
+```bash
+# List campaigns
+python scripts/agent.py --gophish-url https://gophish.lab:3333 --api-key KEY --action list
+
+# Get campaign results
+python scripts/agent.py --gophish-url https://gophish.lab:3333 --api-key KEY \
+  --action results --campaign-id 1 --output report.json
+```
+
+## GoPhishClient Class
+
+### `__init__(base_url, api_key, verify_ssl=False)`
+Initializes the session with Bearer token auth for the GoPhish API.
+
+### `create_sending_profile(name, smtp_from, host, username, password) -> dict`
+Creates an SMTP sending profile. GoPhish API: `POST /api/smtp/`.
+
+### `create_email_template(name, subject, html_body, text_body) -> dict`
+Creates a phishing email template with credential capture enabled. API: `POST /api/templates/`.
+
+### `create_landing_page(name, html, capture_creds, redirect_url) -> dict`
+Creates a credential harvesting page. API: `POST /api/pages/`.
+
+### `import_targets(group_name, targets) -> dict`
+Imports a target list as a GoPhish group. Each target: `{email, first_name, last_name, position}`.
+
+### `launch_campaign(name, template_id, page_id, smtp_id, group_ids, url) -> dict`
+Launches a phishing campaign. API: `POST /api/campaigns/`.
+
+### `get_campaign_results(campaign_id) -> dict`
+Fetches campaign timeline and per-target results. API: `GET /api/campaigns/{id}/results`.
+
+## `compute_metrics(results) -> dict`
+Calculates click rate, submission rate, and report rate from campaign timeline events.
+
+## GoPhish API Endpoints
+
+| Endpoint | Method | Purpose |
+|----------|--------|---------|
+| `/api/campaigns/` | GET/POST | List or create campaigns |
+| `/api/campaigns/{id}/results` | GET | Campaign results with timeline |
+| `/api/templates/` | POST | Create email templates |
+| `/api/pages/` | POST | Create landing pages |
+| `/api/smtp/` | POST | Create SMTP profiles |
+| `/api/groups/` | POST | Create target groups |