"""
Self-learning coherence weighting for AgDR-Mantle.

EMA-based reputation tracking over AKI records with coherence above
the acceptance threshold (default 0.92). Downstream only. Does not
modify the AgDR-Phoenix hot path.
"""
from collections import defaultdict


class CoherenceWeightUpdater:
    """Exponential moving average weight updater for record coherence."""

    def __init__(self, alpha: float = 0.05):
        self.alpha = alpha
        self.reputation = defaultdict(lambda: 0.5)

    def update_weights(self, record: bytes, coherence: float):
        """Update reputation weights based on a record's coherence score.

        Production integration pending. This stub preserves the interface
        contract for the AgDR-Mantle engine.
        """
        pass
