fix: replace removed cudaDeviceProp::memoryClockRate for CUDA 13 compatibility

[egull]

Summary

• cudaDeviceProp::memoryClockRate was removed in CUDA 13, causing a compile error in cuda_check.cpp.
• Replaced with cuDeviceGetAttribute(..., CU_DEVICE_ATTRIBUTE_MEMORY_CLOCK_RATE, i), which returns the same value in kHz and is available across all CUDA versions via the driver API (cuda.h is already included).

Test plan

• Verify build succeeds with CUDA 13+
• Verify reported peak memory bandwidth value is unchanged compared to the old memoryClockRate path on CUDA 12

🤖 Generated with Claude Code

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.71%. Comparing base (1c367bb) to head (2a4bc34).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #16   +/-   ##
=======================================
  Coverage   96.70%   96.71%           
=======================================
  Files          13       13           
  Lines         850      852    +2     
=======================================
+ Hits          822      824    +2     
  Misses         28       28           

Flag	Coverage Δ
unittests	96.71% <100.00%> (+<0.01%)	⬆️

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