Ioniq 6 oscillating steering wheel at higher speeds

### Describe the bug

I drive a Hyundai Ioniq 6 2023 with HDA II and use Comma 3X with OP 0.9.6 and 0.9.7 master-ci.

At speeds up to 100 kph, the lateral control is relatively smooth, even if the system repeatedly corrects jerkily within a curve and steers back quite hard after the curve.

At speeds from 100 kph to 130 kph on the highway, the steering wheel starts to oscillate extremely. Sometimes it calms down on its own, sometimes I have to hold it firmly because otherwise it won't stop. I didn't test it at even higher speeds because it seemed dangerous to me.
It is noticeable that it oscillates on the straight, or after curves or lane changes.

### Which car does this affect?

Hyundai Ioniq 6 2023 HDA II

### Provide a route where the issue occurs

78e8c2388cf1ce49/00000000--09dfcd3706/0

### openpilot version

0.9.6 and 0.9.7 master-ci

### Additional info

_No response_

Start with the supplied route 78e8c2388cf1ce49/00000000--09dfcd3706/0 and compare the reported behavior on the Hyundai Ioniq 6 2023 HDA II using openpilot 0.9.6 and 0.9.7 master-ci. The issue names no source file or test; done means identifying and addressing the high-speed steering oscillation, with the result validated across the reported 100–130 kph range.

Written by the indexing model from the issue text.