Replace <cuda/stream_ref> includes with <cuda/stream>

[bdice]

Description

CCCL deprecated the <cuda/stream_ref> header; cuda::stream_ref is now provided by <cuda/stream>. This PR switches every #include <cuda/stream_ref> to #include <cuda/stream> so RMM builds against newer CCCL.

The cuda::stream_ref type is unchanged. This was observed in rapids-cmake CI: https://github.com/rapidsai/rapids-cmake/actions/runs/31745925779/job/94600794610?pr=1073

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Enterprise

Run ID: 73e82212-e27b-4f7e-8de0-cbf086d6d5f6

📥 Commits

Reviewing files that changed from the base of the PR and between 25334e0 and 84fefef.

📒 Files selected for processing (5)

• cpp/benchmarks/utilities/simulated_memory_resource.hpp
• cpp/tests/cuda_stream_tests.cpp
• cpp/tests/device_check_resource_adaptor.hpp
• cpp/tests/mock_resource.hpp
• cpp/tests/mr/failure_callback_mr_tests.cpp

🚧 Files skipped from review as they are similar to previous changes (5)

• cpp/tests/device_check_resource_adaptor.hpp
• cpp/tests/mock_resource.hpp
• cpp/tests/mr/failure_callback_mr_tests.cpp
• cpp/benchmarks/utilities/simulated_memory_resource.hpp
• cpp/tests/cuda_stream_tests.cpp

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📝 Walkthrough

Summary by CodeRabbit

• Maintenance
  • Updated CUDA stream header usage throughout the library, benchmarks, and tests.
  • Improved compatibility with current CUDA headers without changing public APIs or runtime behavior.

Walkthrough

The pull request replaces <cuda/stream_ref> with <cuda/stream> across RMM headers, implementations, benchmark utilities, and tests. It also updates selected copyright notices. No declarations or runtime logic change.

Changes

CUDA stream header migration

Layer / File(s)	Summary
Public and internal header dependencies cpp/include/rmm/...	RMM headers now include <cuda/stream> instead of <cuda/stream_ref>.
Implementation dependencies cpp/src/...	RMM source files now include <cuda/stream> without changing implementation logic.
Benchmark and test dependencies cpp/benchmarks/..., cpp/tests/...	Benchmark utilities and tests now include <cuda/stream>. Selected copyright notices now include updated attribution or years.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to 84fef

This change only updates deprecated CUDA header includes while preserving the existing stream type; no actionable merge-blocking risk remains after normal checks and review.

Possibly related PRs

• rapidsai/rmm#2511: Shares CUDA stream files, but adds stream-detection and batched-copy functionality.

Suggested reviewers: harrism, rongou

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the primary change: replacing deprecated CUDA stream header includes.
Description check	✅ Passed	The description directly explains the header replacement, its CCCL compatibility purpose, and the unchanged cuda::stream_ref type.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches 💡 1

📝 Generate docstrings 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch cursor/switch-cuda-stream-include-43dc

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[bdice]

/ok to test 25334e0

[bdice]

pre-commit.ci autofix

[bdice]

/ok to test 84fefef

[bdice]

/merge