Currency exchange

bowmark.currency_exchange.getRate(from: string, to: string, options?: CallOptions): Promise<currency_exchangeResult>

interface currency_exchangeResult {
  rate: number;
  warnings: string[];
}
type CallOptions = {
  timeoutMs?: number   // per-provider budget in ms, default 30000, clamped to 1000-55000.
                       // A provider slower than this is DROPPED from the results and
                       // NAMED in warnings — never silently absent
}

return await bowmark.currency_exchange.getRate("USD", "EUR");