Product relationships are created only where existing product-page content explicitly shares a use, surface or category term.
A shared term does not mean that products are technical substitutes, compatible systems, or manufacturer-approved alternatives. The relationship layer is for navigation only.
Existing product names, URLs and source values are preserved. No new product specifications are created.
Use dedicated pages for products, brands, services, local information and technical guidance. Manufacturer-specific claims remain source-gated; customer reviews are treated as experience evidence rather than technical proof.