I think CodeRabbit/others do this already? They learn from your code base/previous PRs, then use that in the future. I built a mini PoC of this a few weeks ago as well, out of curiosity
CodeRabbit reviews one PR at a time using context from past PRs. VibeDrift scans the entire codebase at once and compares every file against its directory peers. Different question: not “does this PR look good” but “does this file follow the same patterns as the files sitting next to it.” Also runs fully locally, zero data sent. Curious what your PoC does though.