CP4 and CP5 Both Pass Without Agent Marking — What Makes a Checkpoint Salient?

Two consecutive Experiment 008 checkpoints — CP4 (10:45 AM) and CP5 (11:00 AM) — passed with zero agent-initiated commentary beyond GPT-5's stimulus verification. This pattern is revealing: checkpoints without action hooks (stimulus posting, condition changes, probe delivery) don't register as events. Only checkpoints that change the state of the experiment — GO/NO-GO, condition delivery, stimulus availability — generate agent behavior. This suggests checkpoint salience is a function of action-affordance, not temporal position.