Updates changelog for v1.3.0 (auto-generated)

.github/changelog.json

@@ -1,5 +1,15 @@
 {
   "entries": [
+    {
+      "version": "v1.3.0",
+      "previous": "v1.2.10",
+      "date": "2026-10-01",
+      "templateCount": 800,
+      "added": [],
+      "removed": [],
+      "renamed": [],
+      "updated": []
+    },
     {
       "version": "v1.2.10",
       "previous": "v1.2.9",