Marketing route group, layout, typography setup

app/(marketing)/layout.tsx

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+/**
+ * Marketing Layout
+ * 
+ * Full-width layout without sidebar for marketing pages.
+ * Navigation will be added in E1.M5.S1.
+ */
+
+import type { ReactNode } from 'react'
+
+interface MarketingLayoutProps {
+  children: ReactNode
+}
+
+export default function MarketingLayout({ children }: MarketingLayoutProps) {
+  return (
+    <div className="min-h-screen bg-white">
+      {/* Navigation will be added in E1.M5.S1 */}
+      {children}
+    </div>
+  )
+}
+

app/(marketing)/page.tsx

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+/**
+ * Manifesto Homepage
+ * 
+ * Main landing page for the AI Speedrun manifesto website.
+ * This page will display the long-form manifesto content.
+ */
+
+export default function ManifestoPage() {
+  return (
+    <main>
+      <div className="max-w-4xl mx-auto px-4 py-8">
+        <h1 className="text-4xl font-bold text-slate-900 mb-4">
+          Manifesto Page
+        </h1>
+        <p className="text-lg text-slate-600">
+          Marketing route group is working. Content will be loaded here.
+        </p>
+      </div>
+    </main>
+  )
+}
+