Code org cleanup

[parashardhapola]

Summary

• Move Cytebase into its own package and relocate artifact lineage under storage, while preserving the root scarf.ArtifactLineage API.
• Fix Git attributes, binary handling, and source-distribution exclusions.
• Update Codecov thresholds and Read the Docs to Ubuntu 26.04 with Python 3.14.
• Add architecture and wheel checks for the retired module paths.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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