Function getAnandadiYoga

getAnandadiYoga(
    weekday: number,
    nakshatraIdx: number,
): {
    index: number;
    name: string;
    type: "auspicious" | "inauspicious" | "neutral";
}
Get the Anandadi Yoga for a given weekday and Nakshatra.

These yogas (Ananda, Kaladanda, etc.) provide a qualitative classification for the entire civil day based on the starting Nakshatra at sunrise.
Parameters
- weekday: number
  0=Sun (Ravivara), ..., 6=Sat (Shanivara)
- nakshatraIdx: number
  0-based index in the 28-system
Returns { index: number; name: string; type: "auspicious" | "inauspicious" | "neutral" }
Yoga data including name and auspiciousness type