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-graphql-security-assessment/references/api-reference.md

@@ -0,0 +1,50 @@
+# API Reference: GraphQL Security Assessment
+
+## GraphQL Introspection Query
+
+```graphql
+{
+  __schema {
+    queryType { name }
+    mutationType { name }
+    types { name kind fields { name type { name kind } } }
+  }
+}
+```
+
+## Security Test Endpoints
+
+| Test | Query | Expected Secure Response |
+|------|-------|-------------------------|
+| Introspection | `{ __schema { types { name } } }` | Error: introspection disabled |
+| Depth limit | Nested `{ users { friends { ... } } }` | Error: max depth exceeded |
+| Batch queries | `[{query: "..."}, {query: "..."}]` | Error or single-query only |
+| Aliases | `{ a1: __typename a2: __typename ... }` | Error: alias limit exceeded |
+
+## Python Libraries
+
+| Library | Version | Purpose |
+|---------|---------|---------|
+| `requests` | >=2.28 | HTTP client for GraphQL POST requests |
+| `gql` | >=3.4 | Python GraphQL client with transport support |
+
+## graphql-cop CLI
+
+```bash
+pip install graphql-cop
+graphql-cop -t https://target.example.com/graphql
+```
+
+## clairvoyance (Schema Enumeration)
+
+```bash
+python3 -m clairvoyance -u <url> -w <wordlist> -o schema.json
+```
+
+## References
+
+- GraphQL specification: https://spec.graphql.org/
+- InQL Burp extension: https://github.com/doyensec/inql
+- clairvoyance: https://github.com/nikitastupin/clairvoyance
+- graphql-cop: https://github.com/dolevf/graphql-cop
+- CSP Evaluator: https://csp-evaluator.withgoogle.com/