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/implementing-api-security-posture-management/references/api-reference.md

@@ -0,0 +1,54 @@
+# API Reference: Implementing API Security Posture Management
+
+## API Discovery from Traffic
+
+```python
+import re
+# Normalize paths: /users/123 -> /users/{id}
+normalized = re.sub(r"/\d+", "/{id}", path)
+normalized = re.sub(r"/[0-9a-f-]{8,}", "/{id}", normalized)
+```
+
+## API Sensitivity Classification
+
+| Category | Patterns | Sensitivity |
+|----------|----------|-------------|
+| PII | `/users`, `/profile`, `/account` | HIGH |
+| Financial | `/payments`, `/billing` | HIGH |
+| Auth | `/login`, `/token`, `/oauth` | HIGH |
+| Admin | `/admin`, `/config` | HIGH |
+| Health | `/health`, `/status` | LOW |
+
+## Risk Scoring Model
+
+| Factor | Points | Description |
+|--------|--------|-------------|
+| High sensitivity data | +30 | PII, financial, auth |
+| High error rate (>10%) | +20 | Possible abuse |
+| State-changing methods | +10 | PUT, DELETE, PATCH |
+| High consumer count | +10 | Large attack surface |
+| Auth endpoint | +15 | Credential target |
+
+## 42Crunch API Audit
+
+```bash
+# CI/CD integration
+curl -X POST https://platform.42crunch.com/api/v1/apis \
+  -H "X-API-KEY: $API_KEY" \
+  -F "file=@openapi.yaml"
+```
+
+## Salt Security API
+
+```python
+import requests
+headers = {"Authorization": "Bearer <token>"}
+# Discover shadow APIs
+resp = requests.get("https://api.salt.security/v1/apis", headers=headers)
+```
+
+### References
+
+- OWASP API Security Top 10: https://owasp.org/API-Security/
+- 42Crunch: https://42crunch.com/
+- Salt Security: https://salt.security/