Since 4.0.0: the results ladder with structuredContent and raw; Google's generated answer rebuilt
from real pages; AI Mode as an engine (google-ai); google on the Web tab; Google URLs as a person's
address bar writes them; incognito as a session; the rendering audit as a live check with the
fixes it found (definition lists, formulas, image alt text, utility classes); the previous review
moved to docs/reviews/.