Gestion du risque

// src/risk.ts
export function positionSize(balanceUSDT: number, price: number, riskPct: number): number {
  const risk = Math.max(0, Math.min(1, riskPct))
  const notional = balanceUSDT * risk
  return Number((notional / price).toFixed(6)) // taille en base asset
}

export function withinExposure(currentExposurePct: number, maxExposurePct: number): boolean {
  return currentExposurePct <= maxExposurePct
}