Node.js AES-256 Encryption Vault

The encryption package is now ready to publish with:

1. AES-256-GCM Implementation - Returns securely encrypted ciphertext, IV, and auth tags for buffers.

2. Tamper-Proof Security - Fails decryption automatically if the ciphertext or auth tag is modified.

3. Environment Safe - Strictly loads keys via secure environment variables (.env) to prevent plaintext leaks.

4. Comprehensive Unit Testing - Full Node test-runner coverage for encryption/decryption round trips and error handling.

5. Node.js & Express Compatible - Plugs directly into any standard backend architecture or file upload stream.