Resolve share URLs from the instance host and ship 1200×630 Open Graph images.

Staging no longer advertises production canonicals, and Slack/social previews get a default hero card with template and article overrides.

Co-authored-by: Cursor <cursoragent@cursor.com>

package.json

@@ -44,7 +44,8 @@
     "db:deploy": "prisma migrate deploy",
     "migrate:smoke": "./scripts/migrate-smoke-local.sh",
     "docker:release": "./scripts/docker-release.sh",
-    "generate:favicons": "node scripts/generate-favicons.mjs"
+    "generate:favicons": "node scripts/generate-favicons.mjs",
+    "generate:og-images": "node scripts/generate-og-images.mjs"
   },
   "dependencies": {
     "@mdx-js/loader": "^3.1.1",