Repair ONNX TensorScatter circular KV-cache indexing and run the offline reference inference fixture.

Repair ONNX TensorScatter circular KV-cache indexing and run the offline reference inference fixture.: a task in MiMo-V2.6-RL-harbor-terminal: MiMo-V2.6-RL Terminal (Harbor) (Harbor dataset). The workspace under /app/vendor/onnx is a frozen slice of a tensor operator used for bounded attention…