SSR migrated to Rust

cores/mizan-rust-ssr/tests/fixture/.gitignore

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+node_modules/
+package-lock.json
+bundle.js

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

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+import { createElement } from "react"
+
+// A trivial component: props in, element out. The keystone only needs to prove
+// a real React tree renders to HTML inside a bare JS context.
+export function Hello({ name }) {
+  return createElement("div", { id: "greeting" }, `Hello, ${name}!`)
+}

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

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+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))

cores/mizan-rust-ssr/tests/fixture/package.json

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+{
+  "dependencies": {
+    "esbuild": "^0.28.0",
+    "react": "^19.2.7",
+    "react-dom": "^19.2.7"
+  }
+}

cores/mizan-rust-ssr/tests/fixture/runner.cjs

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+// Proxy for the embedded-V8 runtime: a bare global context with no Node
+// builtins. Load the IIFE bundle (which assigns globalThis.renderApp) and call
+// it. What renders here renders in rusty_v8 — the engine swaps, the contract
+// (bundle defines a global render fn over a bare context) does not.
+const fs = require("fs")
+const vm = require("vm")
+
+const code = fs.readFileSync(__dirname + "/bundle.js", "utf8")
+
+// The minimal host globals React's bundle touches at init / sync render. The
+// rusty_v8 engine must provide the same set — this list is the spec for it.
+const sandbox = {
+  console, setTimeout, clearTimeout, queueMicrotask, MessageChannel, performance,
+  TextEncoder, TextDecoder,
+}
+sandbox.globalThis = sandbox
+
+vm.createContext(sandbox)
+vm.runInContext(code, sandbox)
+
+const html = sandbox.renderApp({ name: "World" })
+console.log("RENDERED:", html)
+
+const expected = '<div id="greeting">Hello, World!</div>'
+if (html !== expected) {
+  console.error("MISMATCH — expected:", expected)
+  process.exit(1)
+}
+console.log("OK — React bundle renders in a bare JS context (V8 proxy)")