Phase 15.5: CUDABackend::IsValid() only checks pointer, ignores cudaError/initialized

[Cle2ment]

Problem

CUDABackend::IsValid() (line 39) only checks m_CUDAState != nullptr.

If CUDARenderer_Init fails during stream creation, state->initialized remains false and state->cudaError may be set — but IsValid() still returns true.

The MOD-02b CPU fallback mechanism depends on IsValid() returning false when GPU is broken.

Fix

Add checks for state->initialized and state->cudaError in IsValid().

Files

• RayTracing/src/CUDABackend.h
• RayTracing/src/CUDABackend.cpp

[opencode-agent]

Created PR #37

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