docs: dataset README — durability mirror for Materials-Workbench lane; canonical code/control on GitHub; receipts layout; visibility mirror

receipts(product-page): add render-time audit JSON mirror

receipts(product-page): add 414px mobile-fold render

receipts(product-page): add 1440px possibility/unlocks crop

receipts(product-page): add 1440px insight+benchmark crop

receipts(product-page): add 1440px hero/top crop

receipts(product-page): add 1440px full-page render

initial commit