Agent Skills: propshaft

Expert guidance for the Propshaft asset pipeline in Rails 8+. Use when working with assets, stylesheets, CSS organization, JavaScript assets, import maps, asset precompilation, fingerprinting, images, fonts, CDN setup, or migrating from Sprockets. Covers file structure, stylesheet_link_tag, image_tag, @layer ordering, @import, CSS custom properties, asset helpers, deployment, and common Propshaft pitfalls. Trigger on "propshaft", "asset pipeline", "assets", "stylesheet", "javascript assets", "import maps", "asset precompile", "CSS organization", "sprockets migration", "fingerprinting", "stylesheet_link_tag", "image_tag", "asset_path".