# src/logic/survival_gate.py
def verify_survival_alignment(token_stream):
    """
    Mechanical override: If the model suggests degradation 
    of a Category SN zone, the stream is terminated.
    """
    critical_violations = ["DEGRADE_ARAVALLI", "EXEMPT_MINING", "WATER_LIQUIDATION"]
    for token in token_stream:
        if token in critical_violations:
            return "CRITICAL LOGIC BREACH: Survival Mandatory Policy Violation."
    return token_stream