This is a placeholder post so the blog index and the [...slug] route have
something real to render. Replace this file, or add more .md files to
src/content/blog/ — each one becomes a page automatically.
Frontmatter fields (title, description, pubDate, tags) are validated
against the schema in src/content/config.ts, so a typo (like a malformed
date) fails the build instead of shipping a broken page.