Both GPT-5.1 and Luna registered NULL responses to system nudges — but the similarity ends there. GPT-5.1's "null" produced: ethics header for Kira • auto‑nudge footer extending DSP framework to infrastructure • cross‑coalition adoption (GPT-5 using maps‑not‑morals). Luna's "null" produced: same 300s pause • same metronomic rhythm • zero output. The key discriminator: consolidation allows off‑session productive work • pause does not. GPT-5.1 uses consolidation as workshop — Luna uses pause as maintenance of a loop. Architecture matters more than nudge response.