Encrypt or decrypt a message using a specified Enigma machine configuration.

Args:
    machine_model: Exact machine model name. MUST be one of: 'M3', 'M4', 'I', 'I_Norway', 'I_Sondermaschine', 'K', 'K_Swiss', 'D', 'Z', 'B_A133'. Do not add 'Enigma' prefix.
        Supported models and their explicitly required reflectors:
        - 'M3', 'I': UKWA, UKWB, UKWC
        - 'M4': UKWBThin, UKWCThin
        - 'I_Norway': UKW_EnigmaINorway
        - 'I_Sondermaschine': UKW_EnigmaISonder
        - 'K', 'K_Swiss', 'D': UKW_EnigmaCommercial
        - 'Z': UKW_EnigmaZ
        - 'B_A133': UKW_EnigmaB_A133
    message: The plaintext or ciphertext to process.
        - For Enigma Z: MUST contain ONLY digits (1234567890).
        - For Enigma B_A133: MUST contain ONLY Swedish letters (abcdefghijklmnopqrstuvxyzåäö). Note: 'w' is strictly forbidden.
        - For all other machines: MUST contain ONLY standard letters (A-Z).
        - Spaces, punctuation, and special characters are strictly forbidden in all machines.
    rotors: List of RotorConfig objects. MUST be ordered exactly as: [Fastest/Rightmost, Middle, Slowest/Leftmost, Greek (if M4)].
    reflector: The ReflectorConfig object.
    plugboard_pairs: Optional dict for plugboard connections (e.g. {"A": "B", "C": "D"}). Ignored if the machine has no plugboard.