fix(embed): run processor properly on embedded files

fixes #17

src/embed.ts

@@ -127,7 +127,8 @@ class EmbedResolver {
     this.parentFile.info(`Parsing "${embedTarget}"`, this.node);
 
     const embedFile = makeVFile(data, file.path, subpath);
-    const processed = this.processor.parse(embedFile);
+    const node = this.processor.parse(embedFile);
+    const processed = await this.processor.run(node, embedFile);
     this.parentFile.messages.push(...embedFile.messages);
 
     return processed;

src/labels.ts

@@ -34,7 +34,8 @@ function addLabel(
 ): void {
   visit(tree, ['heading', 'textDirective'], (node: Node) => {
     if (!isHeading(node) && !isLabelDirective(node)) {
-      throw new Error(`node of type ${node.type} cannot be labeled`);
+      file.message(`node of type ${node.type} cannot be labeled`);
+      return;
     }
     const namedFile = toNamedVFile(file);
     const { subpath, type } = getLabel(node);