chore: scaffold Bun workspace monorepo

Sets up the initial project structure: two packages (@kitchen-md/core
and @kitchen-md/bin), shared tsconfig, shared fixtures, per-package
test stubs (unit, integration, smoke), .gitignore, and project
CLAUDE.md with Conventional Commits convention.

fixtures/basic.md

@@ -0,0 +1,38 @@
+---
+title: Classic Pancakes
+servings: 4
+tags: [breakfast, quick]
+source: https://example.com/pancakes
+---
+
+# Classic Pancakes
+
+A simple weekend breakfast that comes together in minutes.
+Pairs well with [[maple syrup]] or fresh fruit from the [[farmers market]].
+
+## Ingredients
+
+- @flour{200 g}
+- @milk{300 ml}
+- @eggs{2}
+- @unsalted butter{30 g}
+- @baking powder{1 tsp}
+- @salt{0.5 tsp}
+
+## Method
+
+### Batter
+
+Sift @flour{200 g} and @baking powder{1 tsp} into a $mixing bowl{} along with @salt{0.5 tsp}.
+Make a well in the centre and crack in @eggs{2}.
+Gradually whisk in @milk{300 ml} until you have a smooth, lump-free batter.
+Melt @unsalted butter{30 g} in a $non-stick frying pan{}, then stir most of it into the batter, reserving a little for the pan.
+
+### Cooking
+
+Set the $non-stick frying pan{} over a medium-high flame and let it heat for ~1 min.
+Pour in a ladleful of batter using the $ladle{} and swirl to coat the base.
+Cook for ~2-3 mins until bubbles appear across the surface, then flip and cook for ~1 min more.
+Transfer to a $plate{3} and keep warm in a low oven while you repeat with the remaining batter.
+
+Serve immediately.