Vāstu Date Validator

Scores a single date against the muhūrta decision table for bhūmi-pūjan or gṛha-praveśa. Uses sidereal sun/moon positions to compute pañcāṅga (tithi, nakshatra, karaṇa, yoga, weekday), then checks against Bṛhat Saṁhitā Ch 98-100 rules and flags hard-avoid markers like Viṣṭi (Bhadra) karaṇa.