Real stepfiles kept as references — their full note data and a metrics fingerprint, so a chart can be authored against a concrete example rather than a generic archetype.
What each chart type actually does, read straight out of the generator. These are the rules a chart is built from without a model in the loop — every number below is the one the code used on its last run.
What a player gets when they pick a difficulty off the song wheel. Each slot covers a range of ratings, carries whatever hard rules apply there, and is built to the distribution below.