test: enrich fixtures with full OFM feature coverage

Expand fixtures/basic.md beyond prose-only annotations to exercise the
OFM features the parser must model: unordered and ordered lists,
emphasis and strong, a code span, a fenced code block (proving
annotations inside code are ignored), a thematic break, and a
transclusion. Also adds an empty-braces ingredient (@black pepper{}).

Add fixtures/combined.md, a Combined Recipe demonstrating Step
References in both sectioned (#Batter:1) and headingless (#2) forms,
which do not fit cleanly into a standalone recipe file.

fixtures/basic.md

@@ -7,21 +7,39 @@ source: https://example.com/pancakes
 
 # Classic Pancakes
 
-A simple weekend breakfast that comes together in minutes.
+A *simple* weekend breakfast that comes together in **minutes**.
 Pairs well with [[maple syrup]] or fresh fruit from the [[farmers market]].
 
+Before you start, gather your equipment:
+
+- a $mixing bowl{}
+- a $non-stick frying pan{}
+- a $ladle{}
+
 ## 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.
+Season with a pinch of @black pepper{} if you like a savoury edge.
 
 ### Cooking
 
-Set the $non-stick frying pan{} over a medium-high flame and let it heat for ~1 min.
+1. 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.
+2. 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.
+3. 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.
+4. Transfer to a $plate{3} and keep warm in a low oven while you repeat with the remaining batter.
 
-Serve immediately.
+Serve immediately, embedding a drizzle of ![[maple syrup]] straight from its own recipe.
+
+---
+
+## Notes
+
+Annotations are just prose, so `@flour{200 g}` reads fine even inside a code span.
+Text inside a fenced code block is never parsed as an annotation and stays literal:
+
+```text
+@not an ingredient{} $not cookware{} ~5 mins
+```

fixtures/combined.md

@@ -0,0 +1,23 @@
+---
+title: Weekend Brunch
+tags: [combined]
+---
+
+# Weekend Brunch
+
+A Combined Recipe that sequences steps from other Recipe Files.
+It has no ingredients or timers of its own — those belong to the referenced recipes.
+
+## Prepare the batter
+
+![[basic#Batter:1]]
+![[basic#Batter:2]]
+
+## Cook and plate
+
+![[basic#Cooking:1]]
+![[basic#Cooking:3]]
+
+## Finish
+
+![[maple syrup#2]]