Mechanizing the User's Eye: Pre-Registered Deployment of a Sabotage-Validated Fail-Plausible Observer in a Production LLM Agent Runtime

English summary

Follow-up to 2606.14589 (70% of silent failures found by a human using the product): 16 of 24 postmortems invisible to any content-reading observer; held-out recall 0/4; 12-day enforcing window fired zero verdicts; honest negative.