Public MCP tools

MacroFeed exposes eleven public, read-only MCP methods.

Tool	Purpose
`health_check`	Read service health and configured capability.
`list_indicators`	List supported indicators and source mappings.
`list_countries`	List represented countries and regions.
`list_currencies`	List covered currencies.
`get_upcoming_events`	Query a bounded economic-calendar window.
`get_next_release`	Resolve the next matching scheduled release.
`get_event`	Retrieve one event by `eventId`.
`get_release_history`	Query historical actual and previous observations.
`get_coverage_summary`	Inspect event counts, date ranges, and field density.
`list_calendar_sources`	List official source methods.
`get_calendar_window`	Return compact normalized event snapshots.