Audit a website's content quality for SEO. Crawls pages and measures visible word count, text-to-HTML ratio, and content fingerprints to find thin content, exact duplicate body text across pages, near-duplicate (templated/boilerplate) pages, pages that are mostly markup with little text, and pages missing an H1. Use when the user asks to audit, check, or fix thin content, duplicate or near-duplicate content, low-value pages, content depth, doorway pages, or text-to-HTML ratio on a website.