fix(cmake): derive conservative minimum CUDA architecture - #542
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Build BF16 WMMA kernels in an SM80-only object target because CUDA_ARCHITECTURES is target-scoped. Align CUDA launcher return types with their declarations so successful launches are not treated as failures.
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Fixes mixed-architecture builds that previously treated the first CMAKE_CUDA_ARCHITECTURES entry as the minimum. The parser validates supported suffix forms, rejects indeterminate or malformed values, computes the true minimum, and shares normalized values across capability gates.
Validation:
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