Opening Bell: Nifty gap-up seen on expiry day amid US strength and split Asia

Gift Nifty is pointing 132 points higher, but it's weekly expiry day and the first 30 minutes will be critical. We break down the split Asia picture, KOSPI's sharp fall, what HDFC Bank's breakout means for Nifty's direction, defence stocks in focus after a ₹52,000 crore DAC clearance, and why IT is the one sector sitting this rally out. Key levels, FII flows, and what to watch before you place your first trade.