Analyses supplied search and analytics datasets to explain outcome changes: clicks, impressions, CTR, average position, sessions and conversions, broken down by segment, page group, query group, device and date range. Use when historical performance data is supplied and the question is what changed and why. Do NOT use for page speed or Core Web Vitals, and do NOT use when the data describes URL states rather than outcomes. Use seo-technical-audit instead for delivery performance and Core Web Vitals, and seo-indexation-analysis instead for URL-state snapshots.