Returns upcoming and recent economic events (Fed meetings, jobs reports, CPI, GDP).
Defaults to US events at High/Medium impact only because the raw feed includes
hundreds of low-impact items from every country.
Args:
daysBack: Days to look back (default 0)
daysForward: Days to look forward (default 7)
fromDate: Start date ISO format (alternative to daysBack)
toDate: End date ISO format (alternative to daysForward)
countries: Comma-separated country names to keep (default 'US').
Pass an empty string to disable the country filter.
Common values: 'US','UK','Germany','Japan','China','Canada','France'.
impact: Comma-separated impact levels to keep (default 'High,Medium').
Valid values: 'High','Medium','Low'. Pass empty to keep all levels.
limit: Max events returned after filtering (default 50, max 200).
Returns: { totalMatched, returned, filters, economicCalendar: [...] }.