Big pages no longer slow the agent down

Some pages are huge: a casino lobby or a long product catalogue can list a very large number of controls. On pages like these the agent now reads what is on screen in full and a one-line outline of each region off screen, with its counts and a few example controls.

When it needs something further down, it searches the whole page or opens one region. Every element on the page can still be reached, and smaller pages work exactly as before. Runs on large pages send far less to the model with every step.