Phase 15.1: CUDA stream/event operations missing error checking

[Cle2ment]

Problem

Three CUDA operations in CUDARenderer.cu lack error checking:

1. cudaEventRecord / cudaStreamWaitEvent (line 365-366): If cudaEventRecord fails, compute stream won't properly wait for uploads → kernel may read incomplete data.

2. cudaEventCreate (line 180): All other CUDA calls in CUDARenderer_Init are checked — only cudaEventCreate is not.

3. ConvertToRGBAKernel launch (line 441-445): No cudaGetLastError or any error check after kernel launch → silent failures.

Fix

• Wrap cudaEventRecord/cudaStreamWaitEvent in error checks
• Add explicit error check for cudaEventCreate
• Add cudaGetLastError check after ConvertToRGBAKernel launch

Files

• RayTracing/src/CUDARenderer.cu

[opencode-agent]

Created PR #34

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