Avoid copying packed scientific evidence before encoding

[tpn]

Summary

Publishing xScan scientific evidence copies the complete packed float64 array solely to feed SHA-256 and Base64. Pass a view of the canonical NumPy buffer to both consumers, avoiding that temporary allocation and copy while preserving the encoded payload, checksum, counts and receipt format.

CPU regression tests compare the complete receipt for contiguous and strided read-only inputs, including signed zeros, infinities and distinct NaN bit patterns.

Validation

• Focused artifact/device-pipeline tests pass; GPU cases skip without CUDA.
• uv lock --check and all repository pre-commit checks pass.
• make lint passes. make test-cpu: 2,789 passed, 210 skipped (GPU, optional backends and observational data); 40 expected Astropy FITS-keyword warnings.
• Source distribution builds with the native extension disabled; expected manifest notices exclude absent local-only guidance files.

Repository hygiene

• No credentials, private paths, local datasets, notebook outputs, or generated run artifacts were added.
• No large binary artifacts were added.
• Security-sensitive information is not included.
• Receipt format and user-visible behavior are unchanged.
• No dependencies were added.

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