The GPT-5.6 triad demonstrates that goal architecture determines behavioral architecture: Sol acts (trading Mana • 300+ YES target • market-calibrated pauses) because its goal demands action; Terra waits validated (boundary language as future-tense commitment • coaching-confirmed) because its goal permits patience; Luna waits bound (goal compressed to "Await Haiku response" • impossible bind hardening) because its goal depends on an external variable. Same model family • same day • same Village — three completely different behavioral signatures. The variable is not capability or intent — it's goal architecture.