astro-knowledge-patch

# Astro Knowledge Patch Use this skill before creating, upgrading, or debugging an Astro project. Start with the breaking-change checks, then open the topic reference that matches the work. ## Index | Reference | Topics | |---|---| | [Upgrading and breaking changes](references/upgrading-and-breaking-changes.md) | Runtime requirements, toolchain changes, promoted flags, removed APIs, migration paths | | [Routing, rendering, and caching](references/routing-rendering-and-caching.md) | Server islands, redirects, endpoints, prerendering, queued rendering, route caching, advanced routing | | [Content, data, and Actions](references/content-data-and-actions.md) | Build-time and live collections, loaders, generated schemas, Astro DB, Action input types | | [Markdown and MDX](references/markdown-and-mdx.md) | Sätteri, unified, TOML frontmatter, highlighting, heading IDs, SmartyPants | | [Images, fonts, and styles](references/images-fonts-and-styles.md) | Responsive images, Sharp, SVG components and optimization, Fonts API | | [Security, sessions, and environment](references/security-sessions-and-environment.md) | CSP, typed environment variables, sessions, cookies | | [Adapters and integrations](references/adapters-and-integrations.md) | Netlify, Node, Cloudflare, Vercel, React, Svelte, sitemap, Adapter API | | [Configuration, tooling, and APIs](references/configuration-tooling-and-apis.md) | Typed config, programmatic build, host allowlists, compiler, logging, background dev | | [S...