docs: publish F7-LAS Whitepaper v4.0

[anthfuller]

Summary

• add the authoritative F7-LAS Whitepaper v4.0 PDF and SHA-256 manifest
• update citation and documentation references to the permanent Zenodo DOI
• reconcile repository release status with the published v4.0.0 GitHub release
• preserve the historical Whitepaper v3.0 artifact unchanged
• add validation and negative tests to prevent publication metadata and status drift

Integrity

• Whitepaper v4.0 SHA-256: 67bfbff70f60309608921a58b28ee472d7aca876146988600916af093c992fe7
• Whitepaper v3.0 SHA-256 remains: 24f6e855fc8816edb200280c8cdf26fe41e3736a2544f87906bf2b2d273989fa
• Permanent DOI: https://doi.org/10.5281/zenodo.22867553
• Whitepaper v4.0 is separate from repository release v4.0.0 and was not added to the immutable tag
• no DOCX is included

Validation

• clean-user acceptance passed
• 126 tests passed
• documentation, citation, supply-chain, control-traceability, prompt, policy, allowlist, settings, contract, and OPA validation passed
• evidence verification and deterministic replay passed
• golden dataset passed: 4 scenarios, 1.00 success rate
• dependency audit reported no known vulnerabilities

Do not merge until final independent approval.