[wep21]

Summary

• Add TensorRT RTX 1.6.1.120 and 1.7.1.116 (CUDA 12.9 / 13.4, Linux x86_64 / Windows amd64) and make 1.7.1.116 the default
• Use rules_cuda's hermetic CUDA 12.9.1 redist (cccl, cudart, nvcc) in examples so it builds and runs without a local CUDA install

Testing

• bazel build //..., plus Bazel fetch of the CUDA 12.9 Linux and Windows archives for 1.7.1.116 (header reports 1.7.1.116)
• bazel run //basic:main in examples on an RTX 4070 Laptop GPU (driver 595.91.07): engine builds and inference output is correct; libcudart.so.12 resolves to the hermetic redist
• CUDA 13.4 archives were hashed from direct downloads but not fetched through Bazel

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