This special tag is similar to the startup 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 debugging code into this passage, or set up a late game state to test, and have that code run whenever you use debug mode, no matter which passage you choose to test.
All passages tagged with
debug-startup will run, in alphabetical order
by their passage name, after the passages tagged
startup will run.