debug: add logging to publish extraction pipeline

backend/src/publisher/index.ts

@@ -60,12 +60,25 @@ function extractFromYDoc(ydoc: Y.Doc): {
     frontmatter[key] = value;
   });
 
-  // Convert Y.XmlFragment → ProseMirror JSON using TipTap extensions
+  // Debug: list all shared types in the Y.Doc
+  const sharedTypes: string[] = [];
+  ydoc.share.forEach((_value, key) => sharedTypes.push(key));
+  console.log("[publish] Y.Doc shared types:", sharedTypes);
+  console.log("[publish] frontmatter:", JSON.stringify(frontmatter));
+
+  // Check the XmlFragment directly
+  const fragment = ydoc.getXmlFragment("default");
+  console.log("[publish] XmlFragment 'default' length:", fragment.length);
+
+  // Convert Y.XmlFragment -> ProseMirror JSON using TipTap extensions
   const extensions = getServerExtensions();
   const json = TiptapTransformer
     .extensions(extensions)
     .fromYdoc(ydoc, "default");
 
+  console.log("[publish] TiptapTransformer result type:", json?.type);
+  console.log("[publish] TiptapTransformer content count:", Array.isArray((json as any)?.content) ? (json as any).content.length : "N/A");
+
   if (json && typeof json === "object" && json.type === "doc") {
     return { json, frontmatter };
   }