Add Dataforth process docs + Azure signing attestation letter

- TEST-DATASHEET-PROCESS.md: comprehensive pipeline documentation for
  Dataforth engineering (10 sections, data flow, state diagram, FAQ)
- signing-attestation/: domain ownership attestation letter with
  in-place signature for Azure Trusted Signing identity validation

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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2026-04-15 19:33:06 -07:00
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