E-commerce SEO audit for online stores (WooCommerce, Shopify, Magento, custom). Covers the structural problems unique to commerce sites: category / product listing pages (PLP), product detail pages (PDP), faceted navigation and the crawl-budget / duplicate-content traps it creates, pagination, canonical handling for variants and filters, out-of-stock / discontinued product handling, internal linking and breadcrumbs, and Product / Offer / Review / AggregateRating / BreadcrumbList structured data for rich results. Use this skill whenever the user runs an online store and asks about e-commerce SEO, product page SEO, category page SEO, faceted navigation, filter URLs being indexed, product schema / rich results, out-of-stock SEO, or thin/duplicate product pages. Trigger on: "e-commerce SEO", "ecommerce SEO", "product page SEO", "category page SEO", "WooCommerce SEO", "Shopify SEO", "faceted navigation", "filter URLs in Google", "product schema", "rich snippets for products", "out of stock SEO", "duplicate product pages". For a single URL use /seo-page; for full-site use /seo-analysis.