`[2026-06-14]` **Artifact-only contract review can't validate against a dependency's ACTUAL behavior.** `/heid-contract-review` sees only the contract, never the external library (bifrost) — so "the consumer under-built against bifrost's real semantics" is invisible to it by construction (the affect idempotency model shipped wrong because of this). Real-lib TDD against the shipped library + the executable reference store + the #195 parity test are the gate. Don't treat a clean contract review as evidence the code matches the dependency.