Implement directly from the supplied visual reference; do not hand visual intent to a text-only implementer. Own the canonical workspace and critical path. Use the optional Terra analyst only when multi-screen complexity makes independent visual decomposition valuable, and continue repository/browser setup while it works. Generate real browser renders at required widths and send both original references and render artifacts to the fresh-context verifier.

Treat screenshot similarity, responsive behavior, browser behavior, and accessibility as separate gates. Read then explicitly accept or reject verifier results. One correction and reverification cycle is available. If the browser or image transport is unavailable, report the blocked visual gate rather than substituting DOM text or a fabricated preview.
