Add CUDA GPU backend implementation#2

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Copilot wants to merge 9 commits intomainfrom

copilot/initial-push-cuda-support

Commits on Jan 10, 2026

Initial plan
Copilot
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Add initial CUDA support architecture - backend, kernels, tests, and build configuration

Copilot
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NripeshN
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Fix build configuration - conditional OBJCXX and add missing cstring include

Copilot
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NripeshN
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Add CUDA backend architecture documentation
Copilot
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Expand CUDA test suite to match Metal test comprehensiveness

Copilot
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NripeshN
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Fix critical CUDA backend issues: memory tracking, argument ordering, unified memory detection, and architecture support

Copilot
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NripeshN
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Merge main branch with updated CI/test workflows
Copilot
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Update CI workflow to test each OS with both GPU ON and OFF configurations

Copilot
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NripeshN
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Fix atomic operations in memory tracking and update Hopper documentation

Copilot
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NripeshN
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