Template
Layout, proplan.toml, README/CHANGELOG, placeholder product image, .gitignore, KiBot/release/docgen workflows and TEMPLATE.md. Source of truth: contrib/product-template in B4L/proplan (cargo test --test product_template checks it as Gitea 1.27 creates a repository from it).
Datasheets
Vendor datasheets and application notes (PDF), named after the part, for
example stm32c542-datasheet.pdf.