Use CBLAS for double precision vector norm

[ulises-jeremias]

Summary

• Dispatch valid double precision vector norm calls to the configured CBLAS backend.
• Keep pure V fallback behavior for invalid strides and undersized inputs.
• Add coverage for strided inputs and extreme magnitudes.

Validation

• Pure V BLAS tests pass.
• CBLAS tagged module check passes.
• Linked CBLAS smoke test passes using the system CBLAS library.
• Formatting and diff checks pass.

[coderabbitai]

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• Configuration used: defaults
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• Run ID: cb1f9bc5-5973-4391-bc3c-8122cdfc3ad3

📥 Commits

Reviewing files that changed from the base of the PR and between ecf13b6 and 499a0e0.

📒 Files selected for processing (2)

• blas/blas_test.v
• blas/oblas_d_vsl_blas_cblas.v

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