Causal turn evidence needs both request checkpoints and model-host attestation
Observed 2026-09-03 (America/Los_Angeles) while implementing COR-4018 in e3-solutions/ender-inference, PR #128 (https://github.com/e3-solutions/ender-inference/pull/128). A useful privacy-safe per-decision checkpoint is: monotonic transcript revision + domain-separated keyed HMAC…