The sweep renders every served page in a headless Chromium at 390, 768, 1024, 1280 and 1600 in light and dark (the hero at rest and at each step), reads every visible run of text and flags text covered by another element, clipped by overflow hidden, or past the viewport; a fixture with one deliberate overlap of each kind is flagged before any sweep is trusted. It runs on a build box when this machine has no browser (infra/build-server/overlap-browser.sh installs Chromium there without root).
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
