Google is quietly shifting its AI strategy in India from product discovery to direct transactional execution. Select users of the Gemini app and Google's AI Mode in Search are now seeing a "Buy" button on Flipkart product listings, enabling a direct checkout flow entirely within the AI interface. This pilot, first reported by TechCrunch, represents the first major consumer-facing implementation of Google's Universal Commerce Protocol (UCP). The timing is deliberate. Google is aiming for a wider rollout in October, just ahead of India's high-stakes festive shopping season, when e-commerce giants Flipkart and Amazon engage in their most aggressive annual sales…