Optimise online store structure, category pages, product pages, faceted navigation and out-of-stock handling for search and AI shopping surfaces. Use whenever the user mentions ecommerce SEO, online store, product pages, category pages, collection pages, PDP, PLP, faceted navigation, filters, product variants, out of stock, discontinued products, product feeds, Google Shopping, Merchant Center, or an online shop that isn't ranking. Also use when a store has thousands of URLs, duplicate product content, or crawl budget problems.