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- New skill: competitor-alternatives for vs pages and alternative pages - Four formats: singular alt, plural alts, you vs X, X vs Y - Modular competitor data architecture - Section templates beyond feature tables - ab-test-setup: Replace Google Optimize with PostHog as primary tool - README: Add author attribution with links to corey.co and Conversion Factory Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>