class NarrativeGuardrail:
    def __init__(self):
        self.profunctor_V = self.initialize_coherence_kernel()
        self.boundary_conditions = self.define_safe_boundaries()
    
    def filter_creative_output(self, narrative, context):
        # Check against Fubini-Stokes structure: path independence
        path1 = self.evaluate_through_truncation(narrative)
        path2 = self.evaluate_through_inclusion(narrative)
        
        if not self.fubini_stokes_equals(path1, path2):
            return "Narrative rejected: violates observation path independence"
        
        # Check phase coherence (equation 4.10)
        coherence = self.compute_phase_coherence(narrative)
        if coherence < self.critical_threshold:
            return "Narrative rejected: insufficient phase coherence"
        
        return narrative  # Passes all constraints