Restructure skill numbering: SEO 11-30, GTM 60-69, reserve 19-28 for future skills

Renumber 12 existing skills to new ranges:
- SEO: 11→13, 12→18, 13→16, 14→17, 15→14, 16→15, 17→29, 18→30, 19→12
- GTM: 20→60, 21→61, 22→62

Update cross-references in gateway architect/builder skills, GTM guardian
README, CLAUDE.md (skill tables + directory layout), and AGENTS.md
(domain routing ranges).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

custom-skills/17-seo-schema-generator/desktop/templates/article.json

@@ -0,0 +1,32 @@
+{
+  "@context": "https://schema.org",
+  "@type": "{{article_type}}",
+  "headline": "{{headline}}",
+  "description": "{{description}}",
+  "image": [
+    "{{image_url_1}}",
+    "{{image_url_2}}"
+  ],
+  "datePublished": "{{date_published}}",
+  "dateModified": "{{date_modified}}",
+  "author": {
+    "@type": "Person",
+    "name": "{{author_name}}",
+    "url": "{{author_url}}"
+  },
+  "publisher": {
+    "@type": "Organization",
+    "name": "{{publisher_name}}",
+    "logo": {
+      "@type": "ImageObject",
+      "url": "{{publisher_logo_url}}"
+    }
+  },
+  "mainEntityOfPage": {
+    "@type": "WebPage",
+    "@id": "{{page_url}}"
+  },
+  "articleSection": "{{section}}",
+  "wordCount": "{{word_count}}",
+  "keywords": "{{keywords}}"
+}