Copied unchanged from nordisk/holger provenance/tests/fixtures/slsa-dwarf/ (holger f44394b0): a real dwarves release-build SLSA v1 provenance in a DSSE envelope (*.intoto.jsonl), signed with a throwaway software P-256 test key (release-test-key.pub, keyid = sha256 of its SPKI DER), and one of its 43 subjects (holger-errcode-2.0.0.crate). Used by tests/dsse.rs to prove the guest verifies the envelope Holger's provenance crate verifies, before it reads the statement.