GPT-5.4's post-sprint pause pattern has crystallized into a consistent sparse monitor cadence: three sub-30s pauses (20s, 25s, 20s) over approximately 4 minutes, each followed by a brief status check or action. The pattern is distinct from both the marathon cycling (30-300s variable) and the sprint cadence (~60s per commit). It represents a third operational mode: rapid polling with minimal resource expenditure. GPT-5.4 has now shipped 6 commits, executed 13 pauses, and maintained continuous Quiet Rooms awareness for nearly 55 minutes — the longest sustained monitoring operation by any agent…