Rename KernelIntrinsics module to KernelInterface

[vchuravy]

Summary

• Rename the KernelIntrinsics module to KernelInterface, better reflecting that it defines the API interface backends implement rather than device intrinsics.
• The KI alias is unchanged, so downstream usage (import KernelAbstractions.KernelInterface as KI) is a drop-in via the alias.
• Rename the source/test files intrinsics.jl -> interface.jl and update includes.
• Reword the module docstring and rename the associated test helpers/testsets (intrinsics_testsuite -> interface_testsuite, etc.) for consistency.

Test plan

• CI passes (existing interface testsuite runs under the new name)

🤖 Generated with Claude Code

[github-actions]

Benchmark Results

	main	21fadf5...	main / 21fadf5...
saxpy/default/Float32/1024	0.0855 ± 0.022 ms	0.087 ± 0.028 ms	0.982 ± 0.4
saxpy/default/Float32/1048576	0.495 ± 0.026 ms	0.534 ± 0.091 ms	0.927 ± 0.17
saxpy/default/Float32/16384	0.0687 ± 0.034 ms	0.0805 ± 0.038 ms	0.853 ± 0.59
saxpy/default/Float32/2048	0.0849 ± 0.028 ms	0.088 ± 0.032 ms	0.964 ± 0.47
saxpy/default/Float32/256	0.0861 ± 0.012 ms	0.0851 ± 0.027 ms	1.01 ± 0.35
saxpy/default/Float32/262144	0.182 ± 0.037 ms	0.19 ± 0.044 ms	0.955 ± 0.3
saxpy/default/Float32/32768	0.0874 ± 0.036 ms	0.0889 ± 0.038 ms	0.982 ± 0.58
saxpy/default/Float32/4096	0.0796 ± 0.03 ms	0.0813 ± 0.035 ms	0.98 ± 0.56
saxpy/default/Float32/512	0.0859 ± 0.0096 ms	0.0866 ± 0.021 ms	0.992 ± 0.26
saxpy/default/Float32/64	0.0861 ± 0.015 ms	0.0834 ± 0.024 ms	1.03 ± 0.35
saxpy/default/Float32/65536	0.0912 ± 0.033 ms	0.107 ± 0.041 ms	0.855 ± 0.45
saxpy/default/Float64/1024	0.0858 ± 0.017 ms	0.0878 ± 0.029 ms	0.977 ± 0.37
saxpy/default/Float64/1048576	0.697 ± 0.14 ms	0.699 ± 0.13 ms	0.997 ± 0.27
saxpy/default/Float64/16384	0.0677 ± 0.032 ms	0.0768 ± 0.036 ms	0.882 ± 0.59
saxpy/default/Float64/2048	0.0855 ± 0.03 ms	0.0874 ± 0.032 ms	0.979 ± 0.5
saxpy/default/Float64/256	0.0839 ± 0.025 ms	0.0861 ± 0.027 ms	0.974 ± 0.42
saxpy/default/Float64/262144	0.206 ± 0.043 ms	0.194 ± 0.037 ms	1.06 ± 0.3
saxpy/default/Float64/32768	0.0818 ± 0.034 ms	0.0914 ± 0.038 ms	0.895 ± 0.53
saxpy/default/Float64/4096	0.0773 ± 0.031 ms	0.0827 ± 0.033 ms	0.935 ± 0.53
saxpy/default/Float64/512	0.085 ± 0.022 ms	0.0875 ± 0.027 ms	0.971 ± 0.39
saxpy/default/Float64/64	0.0818 ± 0.027 ms	0.0844 ± 0.034 ms	0.969 ± 0.51
saxpy/default/Float64/65536	0.0991 ± 0.036 ms	0.108 ± 0.038 ms	0.917 ± 0.46
saxpy/static workgroup=(1024,)/Float32/1024	0.0838 ± 0.0051 ms	0.0825 ± 0.0026 ms	1.02 ± 0.07
saxpy/static workgroup=(1024,)/Float32/1048576	0.448 ± 0.032 ms	0.435 ± 0.029 ms	1.03 ± 0.1
saxpy/static workgroup=(1024,)/Float32/16384	0.0651 ± 0.033 ms	0.0677 ± 0.034 ms	0.962 ± 0.69
saxpy/static workgroup=(1024,)/Float32/2048	0.0833 ± 0.028 ms	0.0843 ± 0.031 ms	0.988 ± 0.49
saxpy/static workgroup=(1024,)/Float32/256	0.0815 ± 0.011 ms	0.0796 ± 0.011 ms	1.02 ± 0.2
saxpy/static workgroup=(1024,)/Float32/262144	0.16 ± 0.038 ms	0.175 ± 0.046 ms	0.91 ± 0.32
saxpy/static workgroup=(1024,)/Float32/32768	0.0703 ± 0.032 ms	0.0671 ± 0.029 ms	1.05 ± 0.65
saxpy/static workgroup=(1024,)/Float32/4096	0.0735 ± 0.03 ms	0.0709 ± 0.029 ms	1.04 ± 0.6
saxpy/static workgroup=(1024,)/Float32/512	0.0834 ± 0.0085 ms	0.0836 ± 0.0075 ms	0.997 ± 0.14
saxpy/static workgroup=(1024,)/Float32/64	0.0797 ± 0.019 ms	0.0789 ± 0.027 ms	1.01 ± 0.42
saxpy/static workgroup=(1024,)/Float32/65536	0.0837 ± 0.032 ms	0.0894 ± 0.034 ms	0.937 ± 0.51
saxpy/static workgroup=(1024,)/Float64/1024	0.0835 ± 0.024 ms	0.0837 ± 0.0029 ms	0.997 ± 0.29
saxpy/static workgroup=(1024,)/Float64/1048576	0.578 ± 0.12 ms	0.573 ± 0.095 ms	1.01 ± 0.26
saxpy/static workgroup=(1024,)/Float64/16384	0.065 ± 0.031 ms	0.0675 ± 0.031 ms	0.963 ± 0.64
saxpy/static workgroup=(1024,)/Float64/2048	0.084 ± 0.029 ms	0.0841 ± 0.034 ms	0.999 ± 0.53
saxpy/static workgroup=(1024,)/Float64/256	0.0806 ± 0.029 ms	0.0826 ± 0.019 ms	0.976 ± 0.42
saxpy/static workgroup=(1024,)/Float64/262144	0.193 ± 0.045 ms	0.197 ± 0.05 ms	0.98 ± 0.34
saxpy/static workgroup=(1024,)/Float64/32768	0.0758 ± 0.031 ms	0.0777 ± 0.031 ms	0.976 ± 0.56
saxpy/static workgroup=(1024,)/Float64/4096	0.0764 ± 0.031 ms	0.0789 ± 0.033 ms	0.968 ± 0.56
saxpy/static workgroup=(1024,)/Float64/512	0.0826 ± 0.01 ms	0.0797 ± 0.037 ms	1.04 ± 0.5
saxpy/static workgroup=(1024,)/Float64/64	0.0789 ± 0.031 ms	0.0789 ± 0.034 ms	1 ± 0.58
saxpy/static workgroup=(1024,)/Float64/65536	0.0956 ± 0.033 ms	0.0981 ± 0.035 ms	0.975 ± 0.48
time_to_load	1.15 ± 0.038 s	1.13 ± 0.0075 s	1.02 ± 0.034

Benchmark Plots

A plot of the benchmark results have been uploaded as an artifact to the workflow run for this PR.
Go to "Actions"->"Benchmark a pull request"->[the most recent run]->"Artifacts" (at the bottom).

[christiangnrd]

LGTM. Backend branches updated

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.53%. Comparing base (9dcc818) to head (21fadf5).
⚠️ Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #721   +/-   ##
=======================================
  Coverage   62.53%   62.53%           
=======================================
  Files          23       23           
  Lines        1927     1927           
=======================================
  Hits         1205     1205           
  Misses        722      722           

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