Migrate stream APIs from rmm::cuda_stream_view to cuda::stream_ref

[bdice]

Summary

Track the coordinated migration of stream APIs and call sites from rmm::cuda_stream_view to CCCL's cuda::stream_ref. This propagates cuda::stream_ref through RMM containers and memory resources, RAFT resource and handle APIs, downstream C++ interfaces, Python/Cython bindings, benchmarks, tests, and documentation.

This updates the cuGraph-GNN developer guide to document cuda::stream_ref as the stream type used by stream-ordered operations.

Depends on rapidsai/cugraph#5639.

Tracked in rapidsai/build-planning#318.

Migrations

• Pass cuda::stream_ref through stream pools, resource accessors, conditionals, and downstream APIs without converting to rmm::cuda_stream_view
• Use cuda::stream_ref constructions for default/legacy/per-thread streams
  • rmm::cuda_stream_default ➡️ cuda::stream_ref{cudaStream_t{cudaStreamDefault}}
  • rmm::cuda_stream_legacy ➡️ cuda::stream_ref{cudaStreamLegacy}
  • rmm::cuda_stream_per_thread ➡️ cuda::stream_ref{cudaStreamPerThread}
• Use .get() when calling an API that requires a raw cudaStream_t, including CUDA runtime, library, CUB, and legacy API boundaries (previously rmm::cuda_stream_view used value())
• Use .sync() when synchronizing a cuda::stream_ref (previously rmm::cuda_stream_view used synchronize())
• Update Cython declarations and call sites to pass stream references directly where supported

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[greptile-apps]

Greptile Summary

Updates the developer guide to identify cuda::stream_ref as the stream type accepted by stream-ordered rmm::device_uvector operations.

• Replaces the obsolete cuda_stream_view reference with cuda::stream_ref.

Confidence Score: 5/5

The PR appears safe to merge.

The only change updates the documented stream type consistently with the stated API migration, with no runtime, build, or security behavior affected.

Important Files Changed

Filename	Overview
cpp/docs/DEVELOPER_GUIDE.md	The documentation-only stream type migration is accurate and introduces no substantive issue.

_{Reviews (1): Last reviewed commit: "Document cuda::stream_ref usage" | Re-trigger Greptile}

[alexbarghi-nv]

/merge