feat: add GEO research data and platform-specific ranking factors
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>
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