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docs: add PQC crypto posture receipt schema extension#30

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LalaSkye wants to merge 1 commit intomainfrom
schema/pqc-receipt-posture
Open

docs: add PQC crypto posture receipt schema extension#30
LalaSkye wants to merge 1 commit intomainfrom
schema/pqc-receipt-posture

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@LalaSkye LalaSkye commented Mar 4, 2026

Scope

Single-scope PR: PQC receipt schema extension only.

Changes

  • docs/reference/pqc_receipt_schema.md: Schema doc for crypto_posture receipt section
    • Fields: alg_suite, key_origin, rotation_epoch, policy_hash, toolchain_provenance
    • Enumerated reason codes for crypto posture decisions
    • Validation rules (fail-closed on unknown suites)
    • RFC 8785 (JCS) canonicalization alignment

Constraints

  • Interface-only: no runtime logic changes
  • No gate evaluation, no proprietary algorithms exposed
  • MANIFEST.md entry to follow in separate commit on this branch
  • Ready for cherry-pick into sendmedown/interop-lab when intake opens

Context

Per ALPV DIU submission (Task 1 of 3): receipt schema extension with PQC posture fields.

Introduced a new schema extension for PQC Crypto Posture Receipt, detailing the 'crypto_posture' section and its validation rules.
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