docs(site): hero copy — AI-written apps narrative, correctness chain, ontology link

Replace the category-label hero ("a metadata protocol and TypeScript
toolkit") with the two-beat claim the objectos.ai homepage sets up
("AI writes the app. ObjectOS keeps it governable." → "AI writes the
app. ObjectStack is what it writes."):

- lead carries the mistake-catching chain (strict TypeScript + Zod +
  validation gate at authoring time; runtime enforces permissions/audit)
- proof strip: ~1% code surface · Typed, validated, governed · Self-host
- one-line ontology positioning linking to the objectos.ai essay
  ("the definition layer should be an open protocol you own")
- site <title> template drops the "Protocol" category word

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: os-zhuang

apps/docs/app/[lang]/page.tsx

@@ -6,10 +6,10 @@ import { baseOptions, gitConfig } from '@/lib/layout.shared';
 
 export const metadata: Metadata = {
   title: {
-    absolute: 'ObjectStack — a metadata protocol and TypeScript toolkit for AI-native business apps',
+    absolute: 'ObjectStack — AI writes the app. ObjectStack is what it writes.',
   },
   description:
-    'Describe objects, permissions, workflows, APIs, UI, and AI tools once as typed Zod metadata — ObjectStack derives the TypeScript types, REST API, client SDK, UI, and MCP tools.',
+    'The open target format and runtime for AI-written business apps. Agents write compact typed metadata — often ~1% of a traditional codebase — strict TypeScript, Zod, and a validation gate catch mistakes at authoring time, and the runtime derives the database, REST API, UI, and MCP server. Your business ontology as an open protocol.',
 };
 
 export default function HomePage() {
@@ -20,12 +20,16 @@ export default function HomePage() {
           Open source · Apache-2.0
         </span>
         <h1 className="max-w-3xl text-4xl font-bold tracking-tight text-balance md:text-5xl">
-          A metadata protocol and TypeScript toolkit for AI-native business apps
+          AI writes the app.
+          <br className="hidden sm:block" /> ObjectStack is what it writes.
         </h1>
         <p className="mt-6 max-w-2xl text-lg text-fd-muted-foreground text-pretty">
-          Describe your objects, permissions, workflows, APIs, UI, and AI tools once as typed,
-          version-controlled Zod metadata. ObjectStack derives the TypeScript types, REST API,
-          client SDK, UI, and MCP tools from that single definition.
+          The open target format and runtime for AI-written business apps. Your coding agent
+          writes models, UI, workflows, and permissions as compact typed metadata — often
+          around 1% of a traditional codebase — and strict TypeScript, Zod schemas, and a
+          validation gate catch its mistakes at authoring time. The runtime derives the
+          database, REST API, UI, and MCP server, and enforces permissions and audit on
+          every call. You review a small diff and ship.
         </p>
         <div className="mt-10 flex flex-wrap items-center justify-center gap-3">
           <Link
@@ -50,9 +54,26 @@ export default function HomePage() {
             GitHub
           </a>
         </div>
-        <p className="mt-16 text-sm text-fd-muted-foreground">
-          ObjectStack is the open-source developer framework.{' '}
-          Need the official hosted runtime with AI built in?{' '}
+        <div className="mt-10 flex flex-wrap items-center justify-center gap-x-3 gap-y-2 text-sm text-fd-muted-foreground">
+          <span>~1% code surface</span>
+          <span aria-hidden>·</span>
+          <span>Typed, validated, governed</span>
+          <span aria-hidden>·</span>
+          <span>Self-host anywhere</span>
+        </div>
+        <p className="mt-16 max-w-2xl text-sm text-fd-muted-foreground text-pretty">
+          Your objects, permissions, and flows are your business ontology — the definition
+          layer of the AI era should be an open protocol you own.{' '}
+          <a
+            href="https://www.objectos.ai/en/blog/ai-ontology-open-protocol/"
+            className="inline-flex items-center gap-1 font-medium text-fd-foreground underline underline-offset-4 transition-colors hover:text-fd-primary"
+          >
+            Read why
+            <ArrowRight className="size-3.5" />
+          </a>
+        </p>
+        <p className="mt-3 text-sm text-fd-muted-foreground">
+          Want it governed and hosted, with Build &amp; Ask AI built in?{' '}
           <a
             href="https://www.objectos.ai"
             className="inline-flex items-center gap-1 font-medium text-fd-foreground underline underline-offset-4 transition-colors hover:text-fd-primary"

apps/docs/app/layout.tsx

@@ -4,10 +4,11 @@ import type { Metadata } from 'next';
 
 export const metadata: Metadata = {
   title: {
-    template: '%s | ObjectStack Protocol',
-    default: 'ObjectStack Protocol',
+    template: '%s | ObjectStack',
+    default: 'ObjectStack',
   },
-  description: 'Documentation for the ObjectStack Protocol and runtime.',
+  description:
+    'The open target format and runtime for AI-written business apps — agents write compact typed metadata, the runtime derives the database, API, UI, and MCP server.',
   icons: {
     icon: '/logo.svg',
   },