Phase 16.4: Replace C-style casts with reinterpret_cast in CUDABackend.cpp

[Cle2ment]

3 remaining C-style casts in CUDABackend.cpp:

• Line 221: (cudaStream_t)CUDARenderer_GetComputeStream(...)
• Line 225: (float4*)CUDARenderer_GetDenoiseBuffer(...)
• Line 237: (cudaStream_t)CUDARenderer_GetComputeStream(...)

Replace with reinterpret_cast<cudaStream_t>(...) and reinterpret_cast<float4*>(...).

[github-actions]

Guidance for Phase 16.4

There are actually 4 C-style casts in the current code (not 3 as the issue states — one more was likely added since the issue was filed):

Line	Current
61	(cudaStream_t)CUDARenderer_GetComputeStream(...)
231	(cudaStream_t)CUDARenderer_GetComputeStream(...)
235	(float4*)CUDARenderer_GetDenoiseBuffer(...)
247	(cudaStream_t)CUDARenderer_GetComputeStream(...)

Replace all 4 with:

reinterpret_cast<cudaStream_t>(CUDARenderer_GetComputeStream(m_CUDAState.get()))
reinterpret_cast<float4*>(CUDARenderer_GetDenoiseBuffer(m_CUDAState.get()))

Why: reinterpret_cast is the appropriate C++ cast for converting between unrelated pointer types (e.g., void* → cudaStream_t, void* → float4*). It makes the type-unsafe conversion explicit and grep-able, matching the convention already established in Batch 6 (P2-08→P2-15, PR #18) which replaced C-style casts across the codebase.

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