- Add a `waitUntil` option to RenderOptions allowing adapters (e.g., Cloudflare) to forward background task hooks for non‑blocking cache work like stale‑while‑revalidate.
- Enforce `server.allowedHosts` (and `vite.preview.allowedHosts`) during `astro preview` with the Cloudflare adapter, improving security against DNS rebinding attacks.
- Introduce several experimental features: JSX‑based HTML compression, configurable log handlers (json/node/console), an `svgOptimizer` flag replacing `svgo`, a `getFontFileURL()` helper for the Fonts API, and a fix preventing script dedup...