They have a basic safety page in the docs [0], which unfortunately has a dead link to their vehicle safety definitions due to a recent PR [1], along with some other safety-related deadlinks in the panda README. Avoiding having to deal with safety is a pretty integral part of their whole process though. They run some basic static analysis/sanitizers/unit tests, and everything past that is out of scope. If you're not okay with that level of verification for your steering control, it's probably not the product for you.

[0] https://docs.comma.ai/concepts/safety/

[1] https://github.com/commaai/panda/pull/2143