Goal: find ONNX models that make cargo run -p rten-cli -r -- <model> panic or crash
(not return a clean error). A panic where ONNX Runtime returns a clean error still counts
as a robustness bug. Clean Err returns from rten do not count.
Harness: /tmp/rten-fuzz/ — harness.py builds models, runs ORT (validity check) then
rten, and flags crashes. Binary: target/release/rten.