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/testing-api-for-mass-assignment-vulnerability/references/api-reference.md

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+# API Reference: Testing API for Mass Assignment Vulnerability
+
+## Privilege Field Categories
+
+| Category | Example Fields | Impact |
+|----------|---------------|--------|
+| Role elevation | role, userRole, account_type | Admin access |
+| Admin flags | isAdmin, is_superuser | Full privileges |
+| Permissions | permissions, scopes, groups | Arbitrary access |
+| Account status | verified, is_active | Bypass verification |
+| Financial | balance, credit, discount, price | Monetary fraud |
+| Ownership | user_id, owner_id | Data theft |
+| Internal | debug, is_featured | Hidden features |
+
+## Framework-Specific Payloads
+
+| Framework | Payload Pattern |
+|-----------|----------------|
+| Rails/ActiveRecord | `{"user": {"role": "admin"}}` |
+| Django REST | `{"is_staff": true, "is_superuser": true}` |
+| Express/Mongoose | `{"$set": {"role": "admin"}}` |
+| Spring Boot | `{"authorities": [{"authority": "ROLE_ADMIN"}]}` |
+
+## OWASP API3:2023 Mitigations
+
+| Mitigation | Description |
+|-----------|-------------|
+| DTO/Input Schema | Explicit allowed fields per endpoint |
+| Strong parameters | Framework allowlist (Rails) |
+| Serializer fields | Django REST serializer definition |
+| Property filter | Drop unknown fields before binding |
+
+## Test Tools
+
+| Tool | Purpose |
+|------|---------|
+| Burp Repeater | Manual parameter injection |
+| Param Miner (Burp) | Hidden parameter discovery |
+| Arjun | Automated parameter fuzzing |
+| Postman | Request body manipulation |
+
+## Python Libraries
+
+| Library | Version | Purpose |
+|---------|---------|---------|
+| `requests` | >=2.28 | HTTP API calls |
+| `json` | stdlib | Payload construction |
+
+## References
+
+- OWASP API3:2023: https://owasp.org/API-Security/editions/2023/en/0xa3-broken-object-property-level-authorization/
+- Param Miner: https://portswigger.net/bappstore/17d2949a985c4b7ca092728dba871943