Adds ruff's formatter to the gate. line-length 100 matches the frontend prettier printWidth. The reformat itself lands as the next commit (kept separate so it can go in .git-blame-ignore-revs).
Adds ruff's formatter to the gate. line-length 100 matches the frontend prettier printWidth. The reformat itself lands as the next commit (kept separate so it can go in .git-blame-ignore-revs).