Cover cuco .hpp headers in cudax header testing

[PointKernel]

The cudax header test only globs cuda/experimental/*.cuh, so any .hpp header is silently untested for self-containment. As cuco is migrated into cudax, some of its headers carry the .hpp extension, which would slip through. This PR adds a cuda/experimental/__cuco/*.hpp glob to the non-STF header test, scoped to __cuco so it does not pull in the untested __nccl/__multi_gpu .h headers.

[coderabbitai]

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Reviewing files that changed from the base of the PR and between a1fb0b8 and e32a746.

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• cudax/cmake/cudaxHeaderTesting.cmake

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📝 Walkthrough

Summary by CodeRabbit

• Tests
  • Expanded header test coverage to include additional experimental C++ headers, improving validation of public header builds.

Walkthrough

The non-STF header test generation in cudaxHeaderTesting.cmake now globs an additional header pattern, cuda/experimental/__cuco/*.hpp, alongside the existing cuda/experimental/*.cuh pattern.

Changes

Header Testing Glob Update

Layer / File(s)	Summary
Expand header glob pattern cudax/cmake/cudaxHeaderTesting.cmake	Adds cuda/experimental/__cuco/*.hpp glob in addition to existing cuda/experimental/*.cuh for non-STF header test generation.

Sequence Diagram(s)

Not applicable; this is a build configuration glob pattern change with no observable runtime flow.

Estimated code review effort: 1 (trivial)

Related issues: None provided.

Related PRs: None provided.

Suggested labels: cmake, build

Suggested reviewers: None provided.

suggestion: confirm __cuco headers are self-contained/compilable standalone, since header tests compile each header in isolation.

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[PointKernel]

If reviewers think it's appropriate, I can also extend the coverage to all cudax .hpp and .h headers.

[github-actions]

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