[Placeholder] Site-canonical projection — replace before publishing

This is placeholder content, not a real projection. It exists to prove the Epic 5 site-canonical projection pipeline — frontmatter validation (Story 5.1) and full-body rendering at /writing/<slug>/ (Story 5.2) — end to end with the real content shape.

A real projection file is generated on the authoring side from a published article and committed here by an explicit owner act; it is never edited in place in this repository. Replace this record with a real projection (or remove it) before treating the site-canonical pipeline as content-complete.