mlx-bun library API
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    Per-layer KL sensitivity at each candidate bit-width (port of optiq SensitivityResult).

    interface SensitivityResult {
        layerName: string;
        paramCount: number;
        sensitivities: Record<number, number>;
    }
    Index
    layerName: string
    paramCount: number
    sensitivities: Record<number, number>

    bit-width → mean KL(reference || that-bit) over calibration samples.