- Distinguish verifier capability failures from proof failures. Missing `Mathlib`, missing `Aeneas`, or a missing pinned env script means local replay is unavailable; do not treat it as a clean proof.
- Third-party proof-checking attestations are allowed only as an explicit trust transformation. They must identify the provider, subject repo/commit, theorem names, observed axioms, and signature status. Untrusted attestations must not authorize builds.