I would love it if sem was hooked up into a PR review UI...

That's exactly what inspect does (https://github.com/ataraxy-labs/inspect). It uses sem's entity graph to triage PRs: classifies every change, scores risk based on blast radius and dependents, and groups related changes together.

We are still benchmarking it on diverse benchmarks, and working on it as a research direction. Also working on a diff viewer in rust.

Built something cool that might interest you, semantic diffs

https://x.com/i/status/2029992315532759435