Implements @aris/data-source-weatherkit for fetching weather data from
Apple WeatherKit REST API.
- WeatherKitDataSource class implementing DataSource interface
- Feed items: current, hourly, daily, and alerts
- Priority adjustment based on weather conditions and alert severity
- Unit conversion (metric/imperial)
- Response validation with arktype
- Test fixtures from real API responses
Co-authored-by: Ona <no-reply@ona.com>