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/implementing-envelope-encryption-with-aws-kms/references/api-reference.md

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+# API Reference — Implementing Envelope Encryption with AWS KMS
+
+## Libraries Used
+- **boto3**: AWS SDK for KMS key management and data key generation
+- **cryptography**: AES-256-GCM for local data encryption with generated data keys
+
+## CLI Interface
+
+```
+python agent.py --region us-east-1 encrypt --input <file> --output <out> --key-id <kms_key>
+python agent.py --region us-east-1 decrypt --input <encrypted> --output <out>
+python agent.py --region us-east-1 list-keys
+python agent.py --region us-east-1 audit --key-id <kms_key>
+```
+
+## Core Functions
+
+### `generate_data_key(kms_key_id, region)`
+Generates a data encryption key (DEK) using AWS KMS.
+- `kms.generate_data_key(KeyId=key_id, KeySpec="AES_256")`
+- Returns plaintext key (for local encryption) and encrypted key (for storage).
+
+### `encrypt_data(plaintext_bytes, kms_key_id, region)`
+Performs envelope encryption: generates DEK via KMS, encrypts data locally with AES-256-GCM, stores encrypted DEK alongside ciphertext.
+
+### `decrypt_data(envelope, region)`
+Decrypts envelope: calls `kms.decrypt(CiphertextBlob=encrypted_key)` to recover DEK, then decrypts data locally.
+
+### `list_kms_keys(region)`
+Lists KMS keys with metadata using `kms.list_keys()` and `kms.describe_key()`.
+
+### `audit_key_policy(key_id, region)`
+Audits KMS key policy for overly permissive principals (`Principal: "*"`).
+- `kms.get_key_policy(KeyId=key_id, PolicyName="default")`
+
+## boto3 KMS API Calls
+
+| Method | Purpose |
+|--------|---------|
+| `kms.generate_data_key(KeyId, KeySpec)` | Generate plaintext + encrypted DEK |
+| `kms.decrypt(CiphertextBlob)` | Decrypt encrypted DEK back to plaintext |
+| `kms.list_keys()` | List all KMS keys in the account |
+| `kms.describe_key(KeyId)` | Get key metadata (state, usage, origin) |
+| `kms.get_key_policy(KeyId, PolicyName)` | Get key resource policy JSON |
+
+## Dependencies
+```
+pip install boto3>=1.28 cryptography>=41.0
+```