TAP Prototype Mode
Output Handoff
What carries forward from a TAP prototype, and why that saves repeating the discovery step.
A prototype is only worth building if its output survives the move into Build. The files a run produces are saved to the project, which is what lets a Build request start from an agreed data model rather than from the original source material again.
See TAP Build Mode for what happens to that output once configuration starts reaching your site.