[$] The state of the kernel Rust experiment

The ability to write kernel code in Rust was explicitly added as anexperiment - if things did not go well, Rust would be removed again. Atthe 2025 Maintainers Summit, a session was held to evaluate the state ofthat experiment, and to decide whether the time had come to declare theresult to be a success. The (arguably unsurprising) conclusion was thatthe experiment is indeed a success, but there were some interesting pointsmade along the way.