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Add Princeton GEO study (KDD 2024) 9-method table with exact visibility percentages to SKILL.md. Add AI bot robots.txt configuration. Add keyword stuffing warning (-10% visibility). Add platform-ranking-factors.md reference with per-platform details: Google AI Overviews (5-stage pipeline), ChatGPT (content-answer fit 55%, 30-day freshness 3.2x), Perplexity (3-layer RAG, FAQ Schema priority), Copilot (Bing index + MS ecosystem), Claude (Brave Search, 38K:1 crawl-to-refer ratio). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>