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/auditing-terraform-infrastructure-for-security/references/api-reference.md

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+# API Reference: Auditing Terraform Infrastructure for Security
+
+## Checkov CLI
+
+```bash
+# Scan directory
+checkov -d ./terraform/ --framework terraform --output json
+
+# Scan plan file
+terraform plan -out=tfplan && terraform show -json tfplan > tfplan.json
+checkov -f tfplan.json --framework terraform_plan
+
+# Skip specific checks
+checkov -d ./terraform/ --skip-check CKV_AWS_145
+
+# List all checks
+checkov --list --framework terraform | grep CKV_AWS
+```
+
+## tfsec CLI
+
+```bash
+# Scan with minimum severity
+tfsec ./terraform/ --minimum-severity HIGH --format json
+
+# Generate SARIF for GitHub
+tfsec ./terraform/ --format sarif > tfsec.sarif
+```
+
+## Checkov Python API
+
+```python
+from checkov.runner_registry import RunnerRegistry
+from checkov.terraform.runner import Runner
+
+runner = Runner()
+report = runner.run(root_folder="./terraform/")
+for check in report.failed_checks:
+    print(check.check_id, check.resource, check.file_path)
+```
+
+## Common CKV Check IDs
+
+| Check ID | Description |
+|----------|-------------|
+| CKV_AWS_18 | S3 access logging |
+| CKV_AWS_19 | S3 server-side encryption |
+| CKV_AWS_20 | S3 Block Public Access |
+| CKV_AWS_24 | Security group allows SSH from 0.0.0.0/0 |
+| CKV_AWS_1 | IAM policy with wildcard actions |
+| CKV_AWS_145 | RDS encryption |
+| CKV_AWS_41 | Secrets in Lambda environment variables |
+
+## OPA/Conftest
+
+```bash
+# Evaluate plan against Rego policies
+conftest test tfplan.json --policy ./policy/ --output json
+```
+
+```rego
+package terraform.aws.s3
+deny[msg] {
+    resource := input.resource.aws_s3_bucket[name]
+    not resource.server_side_encryption_configuration
+    msg := sprintf("S3 bucket '%s' missing encryption", [name])
+}
+```
+
+### References
+
+- Checkov: https://www.checkov.io/
+- tfsec: https://aquasecurity.github.io/tfsec/
+- Terrascan: https://runterrascan.io/
+- Conftest: https://www.conftest.dev/