Function market_posture_signal 

pub fn market_posture_signal(
    profile: &FinanceProfile,
    volatility: &FinanceSignal<VolatilityScaleResult>,
    jump_event: &FinanceSignal<FinanceEventDetection<JumpEventResult>>,
    trend_regime: &FinanceSignal<TrendRegimeResult>,
    band_energy: Option<&FinanceSignal<WptBandEnergyResult>>,
    config: &MarketPostureConfig,
) -> Result<FinanceSignal<MarketPosture>>