[TEST] Cover Gluon libdevice helper ops

[Jokeren]

Summary

• add Gluon end-to-end coverage for libdevice helper functions
• patch libdevice exp, fast_expf, and fast_dividef stubs for CPU simulation
• validate results against torch CPU outputs

Tests

• PYTHONPATH=/mnt/keren/triton-viz pytest tests/end_to_end/test_gluon_libdevice_helper_ops.py -q
• PYTHONPATH=/mnt/keren/triton-viz pytest tests/end_to_end/test_gluon_libdevice_helper_ops.py tests/end_to_end/test_gluon_math_helper_ops.py tests/end_to_end/test_gluon_shared_memory_descriptor_ops.py tests/end_to_end/test_gluon_blackwell_tcgen05_multicast_ops.py tests/end_to_end/test_gluon_blackwell_tcgen05_two_cta_ops.py tests/end_to_end/test_gluon_blackwell_tensor_memory_reduction_ops.py tests/end_to_end/test_gluon_blackwell_tcgen05_copy_ops.py tests/end_to_end/test_gluon_blackwell_tcgen05_scaled_ops.py tests/end_to_end/test_gluon_blackwell_tcgen05_ops.py tests/end_to_end/test_gluon_blackwell_tensor_memory_ops.py tests/end_to_end/test_gluon_wgmma_ops.py tests/end_to_end/test_gluon_tma_im2col_ops.py tests/end_to_end/test_gluon_blackwell_tma_ops.py tests/end_to_end/test_gluon_tma_ops.py tests/end_to_end/test_gluon_async_copy_ops.py tests/end_to_end/test_gluon_core_ops.py tests/end_to_end/test_gluon.py tests/end_to_end/test_core.py tests/unit/test_adapters.py -q
• pre-commit run --files triton_viz/core/simulation/gluon.py tests/end_to_end/test_gluon_libdevice_helper_ops.py