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-aws-iam-permission-boundaries/references/api-reference.md

@@ -0,0 +1,57 @@
+# API Reference: AWS IAM Permission Boundary Agent
+
+## Dependencies
+
+| Library | Version | Purpose |
+|---------|---------|---------|
+| boto3 | >=1.28 | AWS SDK for IAM permission boundary management |
+
+## CLI Usage
+
+```bash
+python scripts/agent.py \
+  --profile security-admin \
+  --region us-east-1 \
+  --audit \
+  --output-dir /reports/ \
+  --output iam_boundary_report.json
+```
+
+## Functions
+
+### `get_iam_client(profile, region)`
+Creates boto3 IAM client with optional named profile.
+
+### `create_permission_boundary(client, policy_name, allowed_services, allowed_regions) -> dict`
+Creates an IAM policy for use as a permission boundary. Includes a DenyBoundaryChanges statement to prevent boundary removal. Uses `client.create_policy()`.
+
+### `attach_boundary_to_role(client, role_name, boundary_arn) -> dict`
+Calls `client.put_role_permissions_boundary()` to attach a boundary to a role.
+
+### `audit_roles_without_boundary(client) -> list`
+Paginates `client.list_roles()` and identifies roles missing `PermissionsBoundary`.
+
+### `audit_boundary_effectiveness(client, role_name) -> dict`
+Calls `client.get_role()`, `list_attached_role_policies()`, `list_role_policies()` to show effective policy stack.
+
+### `generate_report(client) -> dict`
+Orchestrates audit and generates compliance report.
+
+## boto3 IAM Methods Used
+
+| Method | Purpose |
+|--------|---------|
+| `create_policy(PolicyName, PolicyDocument)` | Create boundary policy |
+| `put_role_permissions_boundary(RoleName, PermissionsBoundary)` | Attach boundary |
+| `list_roles()` | Enumerate all roles |
+| `get_role(RoleName)` | Get role details including boundary |
+
+## Output Schema
+
+```json
+{
+  "roles_without_boundary_count": 12,
+  "roles_without_boundary": [{"role_name": "dev-role", "arn": "arn:aws:iam::..."}],
+  "recommendations": ["Attach permission boundaries to 12 roles"]
+}
+```