Create web/app.js

web/app.js

@@ -0,0 +1,12 @@
+async function runProgram() {
+  const program = document.getElementById("program").value;
+
+  const response = await fetch("/run", {
+    method: "POST",
+    headers: { "Content-Type": "application/json" },
+    body: JSON.stringify({ program_hex: program })
+  });
+
+  const data = await response.json();
+  document.getElementById("output").textContent = data.stdout || data.stderr;
+}