This special tag is similar to the header tag, but only causes the passage to be included if you're running the story in debug mode.
This has a variety of uses: you can put special debug display code in this passage, which can show the status of certain variables or provide links to change the game state as you see fit, and have that code be present in every passage in the story, but only during testing.
All passages tagged with
debug-header will run before the passages tagged
header will run,
ordered by their passage name, sorted alphabetically, and by case (capitalised names appearing
before lowercase names).