Update content through Mattrbld

src/posts/test-post.md

@@ -7,6 +7,9 @@ image:
   title: null
 ___mb_schema: /.mattrbld/schemas/post.json
 datePosted: '2026-09-24T10:30:00-07:00'
-dateUpdated: '2026-09-24T10:34:51-07:00'
+dateUpdated: '2026-09-24'
+tags:
+  - sample
+  - test
 ---
 Hello world.