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/product.json

@@ -0,0 +1,76 @@
+{
+  "@context": "https://schema.org",
+  "@type": "Product",
+  "name": "{{name}}",
+  "description": "{{description}}",
+  "image": [
+    "{{image_url_1}}",
+    "{{image_url_2}}",
+    "{{image_url_3}}"
+  ],
+  "sku": "{{sku}}",
+  "mpn": "{{mpn}}",
+  "gtin13": "{{gtin13}}",
+  "brand": {
+    "@type": "Brand",
+    "name": "{{brand_name}}"
+  },
+  "offers": {
+    "@type": "Offer",
+    "url": "{{product_url}}",
+    "price": "{{price}}",
+    "priceCurrency": "{{currency}}",
+    "priceValidUntil": "{{price_valid_until}}",
+    "availability": "https://schema.org/{{availability}}",
+    "itemCondition": "https://schema.org/{{condition}}",
+    "seller": {
+      "@type": "Organization",
+      "name": "{{seller_name}}"
+    },
+    "shippingDetails": {
+      "@type": "OfferShippingDetails",
+      "shippingRate": {
+        "@type": "MonetaryAmount",
+        "value": "{{shipping_cost}}",
+        "currency": "{{currency}}"
+      },
+      "deliveryTime": {
+        "@type": "ShippingDeliveryTime",
+        "handlingTime": {
+          "@type": "QuantitativeValue",
+          "minValue": "{{handling_min_days}}",
+          "maxValue": "{{handling_max_days}}",
+          "unitCode": "DAY"
+        },
+        "transitTime": {
+          "@type": "QuantitativeValue",
+          "minValue": "{{transit_min_days}}",
+          "maxValue": "{{transit_max_days}}",
+          "unitCode": "DAY"
+        }
+      }
+    }
+  },
+  "aggregateRating": {
+    "@type": "AggregateRating",
+    "ratingValue": "{{rating}}",
+    "reviewCount": "{{review_count}}",
+    "bestRating": "5",
+    "worstRating": "1"
+  },
+  "review": [
+    {
+      "@type": "Review",
+      "reviewRating": {
+        "@type": "Rating",
+        "ratingValue": "{{review_rating}}",
+        "bestRating": "5"
+      },
+      "author": {
+        "@type": "Person",
+        "name": "{{reviewer_name}}"
+      },
+      "reviewBody": "{{review_text}}"
+    }
+  ]
+}