Option A — Abstract
A swept flow field on the hero ground itself, following the reference supplied on 29 September: a fan of 150 hairline strands converging into a bright caustic edge, one of them the brand accent carrying a node, dissolving toward the open end. There is no panel and no frame — the hero's own background is the visual.
Why it might win: nothing to licence, nothing to load and nothing to replace later. It is one inline SVG coloured entirely by CSS, so the same drawing serves a light hero and a dark one, and it scales to any width without a second asset. It cannot date the way a stock photograph does.
What it costs: it is abstract. Pages that want human warmth — Careers, About, Customer Stories — will not get it here. On the light ground it is necessarily quiet; if it needs more presence there, the dark ground is the stronger showing and eight inside heroes are dark already.
Shown twice: on a dark hero with no aside, and on a light hero that carries the facts aside.