Session 53: Social preview fix — OG meta tags + image (2246 tests)

The link preview still showed engineer-speak ("Bayesian intelligence", "kill
conditions") because the OG meta tags were never updated after the S44 landing
cleanup.

- layout.tsx: de-jargoned the openGraph + main description + titles → "Pre-graded
  player props with proprietary archetypes. Correlation-aware Parlay Lab.
  Real-time line movement tracking. Built in Detroit." (Used "proprietary
  archetypes" not "45" — codebase has 41.)
- NEW app/opengraph-image.tsx (+ twitter-image.tsx re-export): dynamically
  generated 1200x630 card — VYNDR wordmark, "The books have every advantage. /
  We built this to give it back." + feature row. Node runtime (not edge —
  self-hosted standalone). Both routes prerender to a real PNG.
- Removed the stale /og-image.png metadata ref so the file convention owns the
  image (no duplicate og:image tag).

Backend 2239 -> 2246 tests (+7), 193 suites. Web build clean (exit 0).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

web/src/app/layout.tsx

@@ -46,7 +46,7 @@ export const metadata: Metadata = {
     template: '%s · VYNDR',
   },
   description:
-    "Grade your props across every sport with intelligence the books don't want you to have. NBA, MLB, WNBA, and soccer today — NFL and more through 2026. World Cup 2026 intelligence: xG regression, altitude, referee, penalty taker. Built in Detroit.",
+    'Pre-graded player props with proprietary archetypes. Correlation-aware Parlay Lab. Real-time line movement tracking. NBA, MLB, WNBA, and soccer. Built in Detroit.',
   applicationName: 'VYNDR',
   authors: [{ name: 'VYNDR', url: 'https://vyndr.app' }],
   manifest: '/manifest.json',
@@ -62,20 +62,21 @@ export const metadata: Metadata = {
     'prop betting tools',
   ],
   openGraph: {
-    title: "VYNDR — Intelligence the books don't want you to have",
+    title: "VYNDR — The edge the books don't want you to have",
     description:
-      'Read player props with Bayesian intelligence. See the factors. Know the kill conditions. Take the edge back.',
+      'Pre-graded player props with proprietary archetypes. Correlation-aware Parlay Lab. Real-time line movement tracking. Built in Detroit.',
     url: 'https://vyndr.app',
     siteName: 'VYNDR',
-    images: [{ url: '/og-image.png', width: 1200, height: 630, alt: 'VYNDR — Sports Prop Intelligence' }],
+    locale: 'en_US',
     type: 'website',
+    // og:image is supplied by the file-based opengraph-image.tsx convention.
   },
   twitter: {
     card: 'summary_large_image',
-    title: 'VYNDR',
-    description: 'The books have every advantage. We built this to give it back.',
-    images: ['/og-image.png'],
+    title: "VYNDR — The edge the books don't want you to have",
+    description: 'Pre-graded player props. Proprietary archetypes. Parlay Lab. Built in Detroit.',
     creator: '@getvyndr',
+    // twitter:image is supplied by the file-based twitter-image.tsx convention.
   },
   icons: {
     icon: [