SSR migrated to Rust

cores/mizan-rust-ssr/tests/fixture/entry.js

@@ -0,0 +1,8 @@
+import { renderToStaticMarkup } from "react-dom/server.browser"
+import { createElement } from "react"
+import { Hello } from "./Hello.js"
+
+// The bundle exposes one global the embedded engine calls. No module system at
+// runtime — the engine receives a bare script that defines `renderApp`. This is
+// the production shape in miniature: build-time bundle, runtime eval.
+globalThis.renderApp = (props) => renderToStaticMarkup(createElement(Hello, props))