Complete folder anatomy for all 649 cybersecurity skills + update LICENSE to Mahipal

- Add scripts/agent.py and references/api-reference.md to all remaining skills
- Update all 648 LICENSE files: copyright now reads 'Mahipal'
- Add implementing-security-monitoring-with-datadog (new skill with full anatomy)
- All 649 skills now have: SKILL.md, LICENSE, scripts/agent.py, references/api-reference.md

skills/deploying-tailscale-for-zero-trust-vpn/references/api-reference.md

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+# Tailscale Zero Trust VPN — API Reference
+
+## Libraries
+
+| Library | Install | Purpose |
+|---------|---------|---------|
+| requests | `pip install requests` | Tailscale API v2 client |
+
+## Tailscale API v2 Endpoints
+
+| Method | Endpoint | Description |
+|--------|----------|-------------|
+| GET | `/api/v2/tailnet/{tailnet}/devices` | List all devices in tailnet |
+| GET | `/api/v2/tailnet/{tailnet}/acl` | Get ACL policy |
+| PUT | `/api/v2/tailnet/{tailnet}/acl` | Update ACL policy |
+| GET | `/api/v2/tailnet/{tailnet}/dns/nameservers` | Get DNS nameservers |
+| GET | `/api/v2/tailnet/{tailnet}/keys` | List auth keys |
+| GET | `/api/v2/device/{deviceid}` | Get device details |
+| DELETE | `/api/v2/device/{deviceid}` | Remove device from tailnet |
+| GET | `/api/v2/tailnet/{tailnet}/webhooks` | List webhooks |
+
+## Base URL & Authentication
+
+```
+Base: https://api.tailscale.com
+Header: Authorization: Bearer <api-key>
+```
+
+## ACL Policy Structure
+
+| Field | Description |
+|-------|-------------|
+| `acls` | Access control rules (src, dst, action) |
+| `groups` | Named groups of users |
+| `tagOwners` | Tag-based device ownership |
+| `ssh` | Tailscale SSH access rules |
+| `autoApprovers` | Auto-approve routes and exit nodes |
+| `tests` | ACL policy unit tests |
+
+## Device Fields
+
+| Field | Description |
+|-------|-------------|
+| `hostname` | Device hostname |
+| `os` | Operating system |
+| `clientVersion` | Tailscale client version |
+| `keyExpiryDisabled` | Whether key expiry is disabled |
+| `online` | Current online status |
+| `lastSeen` | Last seen timestamp |
+| `addresses` | Tailscale IP addresses |
+
+## External References
+
+- [Tailscale API Docs](https://tailscale.com/api)
+- [Tailscale ACL Policy](https://tailscale.com/kb/1018/acls)
+- [Tailscale SSH](https://tailscale.com/kb/1193/tailscale-ssh)