Add SloanOps return banner to demo sites

scripts/verify-build.mjs

@@ -12,6 +12,7 @@ const pages = await Promise.all(required.filter((file) => file.endsWith('.html')
 for (const { file, html } of pages) {
   if (html.includes('{{') || html.includes('{%')) throw new Error(`${file} contains an unresolved template placeholder.`);
   if (!/<title>[^<]+<\/title>/.test(html)) throw new Error(`${file} is missing a title.`);
+  if (!html.includes('data-demo-banner') || !html.includes('href="https://sloanops.com/"')) throw new Error(`${file} is missing the SloanOps demo banner.`);
   for (const match of html.matchAll(/(?:src|href)="(\/images\/[^"?#]+)"/g)) await access(resolve(root, `.${match[1]}`));
 }
 
@@ -27,6 +28,10 @@ if (key === 'www') {
 if (key === 'blog') {
   const publishedPosts = ['first-walk-after-work', 'gentler-grooming-day', 'overnight-care-checklist', 'weekend-care-prep'];
   await Promise.all(publishedPosts.map((slug) => access(resolve(root, `posts/${slug}/index.html`))));
+  for (const slug of publishedPosts) {
+    const html = await readFile(resolve(root, `posts/${slug}/index.html`), 'utf8');
+    if (!html.includes('data-demo-banner') || !html.includes('href="https://sloanops.com/"')) throw new Error(`Blog post is missing the SloanOps demo banner: ${slug}.`);
+  }
   if (home.includes('Draft only example for editorial review')) throw new Error('Draft blog post appeared in the journal.');
   try {
     await access(resolve(root, 'posts/draft-only-example/index.html'));