Configures a CI matrix that runs the smoke / regression suite across multiple browsers per Playwright's three-engine support (Chromium, Firefox, WebKit / Safari) plus branded variants (chrome, msedge channels). Wires GitHub Actions / GitLab CI matrix syntax, captures per-browser screenshots, and aggregates per-browser pass/fail. Use when the product targets multiple browsers and the team wants automated cross-browser testing or browser-compatibility regression - e.g. a 'works in Chrome, broken in Safari' bug that needs Chrome / Firefox / Safari coverage.