People are making a big deal of the fact that there's multiple prompts or interactions, but so what? That's true of source code too! The final commit doesn't reflect every last keystroke or thing you ever said while working on it; you may have had a long conversation with your coworkers, but then you kept only the summary part that mattered. It is the final, distilled, comprehensive patch.
So the requirement should be that there is a prompt, or set of prompts, plus documentation, which distill out everything learned or done in a single master prompt which then suffices to build a similarly capable codebase. ('Reproducibility' in the sense of replication, getting roughly the same result, not 'reproducibility' in the sense of bit-identical builds. (This is just 'compaction' on steroids, and something I generally do not have problem doing with my own LLM creative writing, no matter how many iterations or conversations it took to get to the final idea.)
If it s not possible to create such a thing for a codebase, even with the vibecoded artifact at hand, then that raises an awful lot of questions about the quality or what went wrong, and the requirement is doing its job of keeping a Superfund site away from the rest of us.
The v0 is just this requirement. If you find that people are lying about it (which they probably will for the same reasons that they lie about Show HNs not being vibecoded or front page slop not being slop eg. https://news.ycombinator.com/item?id=47205208 ), then you can start enforcing it simply by requiring someone else to have run the prompts and found the final result to be reasonably useful and as advertised.