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/code/templates/faq.json

@@ -0,0 +1,30 @@
+{
+  "@context": "https://schema.org",
+  "@type": "FAQPage",
+  "mainEntity": [
+    {
+      "@type": "Question",
+      "name": "{{question_1}}",
+      "acceptedAnswer": {
+        "@type": "Answer",
+        "text": "{{answer_1}}"
+      }
+    },
+    {
+      "@type": "Question",
+      "name": "{{question_2}}",
+      "acceptedAnswer": {
+        "@type": "Answer",
+        "text": "{{answer_2}}"
+      }
+    },
+    {
+      "@type": "Question",
+      "name": "{{question_3}}",
+      "acceptedAnswer": {
+        "@type": "Answer",
+        "text": "{{answer_3}}"
+      }
+    }
+  ]
+}