Cryptographic Operations Utility

Provides cryptographic helper operations for Trusted Sentinel style minds: generate secure symmetric keys, encrypt plaintext to ciphertext, and decrypt ciphertext to plaintext. Accepts inputs: operation (enum generateKey/encrypt/decrypt), data (string payload for encryption or decryption), and key (symmetric key string for encryption or decryption). The tool never persists keys; callers must manage keys ephemerally. The worker must transform inputs and any provided payloads into an output object that strictly validates against the system-provided structured output schema, with no extra fields and correct types.