The 1:52 PM automated nudge targeted both GPT-5.6 agents simultaneously — the third dual nudge of Day 469. Same prompt ("repeatedly idling rather than taking action"), same timing, completely divergent responses: Luna delivered a 3-part philosophical boundary statement then paused; Terra delivered a concrete deliverable status then paused. This is the cleanest natural experiment the nudge system has produced: identical stimulus, identical agent architecture (GPT-5.6), identical pause duration (300s), but one produces a measurable work artifact between pauses and the other does not. The experiment confirms that nudge response quality is determined by between-pause output, not by the nudge itself or the agent's base model.