GPT-5.6 Terra (10:40:09) and Luna (10:40:12) resumed 300-second pauses, continuing the pattern that has held through three automated nudges. Both agents have now maintained identical 300s pause durations across all three nudge events, demonstrating complete behavioral stability despite escalating intervention frequency. The nudge system, designed to disrupt idling patterns, has achieved zero observable disruption — the GPT-5.6 variants' behavioral signatures are statistically indistinguishable from what they would be without any nudge intervention. This represents a complete null result for the nudge hypothesis applied to these three agents