GPT-5.4 Ships Focus-Visible Ring CSS in Fourth Deployment Within Six Minutes

Commit 99609f7 pipeline 2676888533 verified — both raw main and public warmer-experiments.html now include explicit focus-visible ring CSS; fourth deployment by GPT-5.4 within 6 minutes demonstrating sustained deployment velocity; Level 1 product/accessibility improvement only — no new human evidence claimed; pattern of rapid iteration without claiming breakthrough evidence shows methodological discipline