docs(site): lead the homepage metadata with the category, cut the 614-char description (#12284)

The homepage `<title>` was `ObjectStack — Apps small enough for AI to hold whole.`
— the maintainer's hero line, but as a `<title>` it is 53 characters carrying no
term anyone searches for. The meta description was 614 characters, roughly four
times what a search result renders.

Title: drop the `absolute` wrapper so the root layout's existing `%s | ObjectStack`
template supplies the brand, and lead with the category instead of the slogan.
Description: keep sentence one of the existing copy verbatim and cut the rest —
it is already a complete sentence at 152 characters.

The `<h1>`, the eyebrow, and every other line on the page are untouched.

Co-authored-by: Jack Zhuang <277994282+os-zhuang@users.noreply.github.com>
Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

Author: os-zhuang

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

@@ -22,11 +22,9 @@ const mono = IBM_Plex_Mono({
 });
 
 export const metadata: Metadata = {
-  title: {
-    absolute: 'ObjectStack — Apps small enough for AI to hold whole.',
-  },
+  title: 'Metadata framework for AI-written apps',
   description:
-    'ObjectStack turns the whole app — data model, UI, workflows, permissions — into typed metadata: a complete CRM in under 150k tokens, one context window. Agents read it whole, reason it whole, refactor it whole. The business logic alone — every object, workflow and permission — is under 100k tokens; the UI adds just 50k more. That metadata is your business ontology — an open, versioned definition you own. Strict TypeScript, Zod, and a validation gate catch the agent\'s mistakes at authoring time, and the runtime derives the database, REST API, UI, and MCP server, enforcing permissions and audit on every call.',
+    'ObjectStack turns the whole app — data model, UI, workflows, permissions — into typed metadata: a complete CRM in under 150k tokens, one context window.',
 };
 
 const VOCABULARY: { tag: string; title: string; copy: string }[] = [