markdown-style The Markdown authoring and review skill. Owns two layers of rules and the procedure for applying them: 1. Syntax canon — what valid Markdown looks like. Derived from the Markdown Guide basic-syntax reference. Full canon: . 2. Style overlay — opinionated rules a reviewer enforces on top of valid syntax. Derived from Google's Markdown style guide. Full overlay: . Load this skill when the question is "is this doc well-formed?" — not "does this doc belong here?" (that is ). Style review never decides whether a doc should exist. It assumes the doc earned its place and asks whether t…