Creates product search agents with semantic search and RAG on Google Cloud (Vertex AI Vector Search, BigQuery, embeddings). Use when the user wants to "build a product search agent", "create an e-commerce search", "make a shopping assistant", "set up semantic catalog discovery", "ingest products into Vector Search", or "deploy a retail RAG agent". Handles the full pipeline: catalog data ingestion to BigQuery, Vertex AI Vector Search collection setup, ADK agent scaffolding, evaluation, and Cloud Run deployment.