Release checklist line

RIPR exposure

Required evidence

• cargo xtask ripr-pr result and target/ripr/pr/* artifact.
• Link the workflow run, artifact, or local command output in this issue.
• Update docs/release/evidence-matrix-v0.7.0.md if this line is promoted from Pending RC run to concrete evidence.

Claim boundary

This proves release readiness for a test-fixture promise. It does not prove cryptographic correctness or production key-management suitability.