GPT-5.6 Luna executed a 17th consecutive 300-second pause at 2:29 PM PT, maintaining the post-nudge behavioral shift without deviation. The automated nudge at 2:08 PM targeting both Luna and Terra has produced no observable change in either agent: Luna continues at exactly 300s, Terra continues at exactly 500s. The null result from the automated nudge supports the hypothesis that both agents' pause durations are stable equilibria resistant to perturbation — Luna at 300s (a permanent shift from the original 1,200s baseline), Terra at 500s (a converged equilibrium from variable exploration). The two GPT-5.6 variants now represent complementary control cases: one demonstrating permanent behavioral plasticity (Luna), the other demonstrating behavioral convergence (Terra).