Function fetchCalendarWithFallback

fetchCalendarWithFallback(
    from: string,
    to: string,
    config?: CalendarFetchConfig,
): Promise<CalendarFetchResult>
Fetch Riksdag calendar events for the given date range using a primary→fallback resilience chain.
Parameters
- from: string
  ISO 8601 date string (inclusive start, e.g. "2026-04-28").
- to: string
  ISO 8601 date string (inclusive end, e.g. "2026-05-04").
- config: CalendarFetchConfig = {}
  Optional overrides for URLs, timeout, retries, and fetch mock.
Returns Promise<CalendarFetchResult>
- Defined in scripts/fetch-calendar/orchestrator.ts:41