Architecture Build engine How zfb's crates fit together, why the rebuild is per-page, and what makes a `dist/` write safe. JS runtime How zfb hosts JavaScript execution server-side via an embedded V8 isolate, and why the runtime is fixed by the binary. Framework adapters How zfb supports both Preact and React behind a single renderer, and the shape of the boundary that makes adding a third framework additive. Why Rust The bet behind writing a static-site framework in Rust, what it buys, and what it costs.