Add argentum-core near-miss-v1 negative-path fixtures to cross-extension matrix#27
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…ion matrix Three fail-closed vectors (ambiguous_issuer_binding, rescoped_replay, semantic_drift) from argentum-core near-miss-v1 — AEOESS byte-verified in A2A #1734, Nobulex 5/5 co-signed 2026-05-28.
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Three negative-path vectors from
argentum-corenear-miss-v1added to the cross-extension fixture matrix in the v0.3.3 working doc:ambiguous_issuer_binding— fails closed when the signing key cannot be unambiguously bound to the declared issuerrescoped_replay— fails closed when presented scope diverges from the scope embedded in the action_ref preimagesemantic_drift— fails closed when action_type semantics shift between issuance and verificationAEOESS byte-verified in A2A #1734. Nobulex 5/5 co-signed 2026-05-28.
Note on preimage encoding: argentum-core uses RFC 3339 string for timestamp; implementations applying W3C CG #34 epoch-ms MUST convert before hashing per the action-ref.md conversion note (commit 722c2ab).
Related: composition-ref-v1.0 (commit 78d4686, 2026-05-28) implements key_source ∈ {inline, cache, resolver} as an optional signed field — same enum as the v0.3.3 definition. Canonical field set: SHA-256(JCS({action_ref, authority_verified_at_ms, composition_key, delegation_ref, revocation_check_at_ms, revocation_ref, scope, version})), full 64-char hex. If that layer belongs in the cross-extension matrix, spec and fixtures are ready.