Add comprehensive documentation for the dual-engine performance evaluation system: - System architecture and data flow - Score calculation methodology (0-100 approximation from CWV thresholds) - Detailed metrics reference (LCP, FCP, CLS, TBT, TTFB) - Testing engines comparison (Sitespeed vs PSI) - Complete code structure map (file-by-file breakdown) - Case study: rds.ink 77 score with actionable fixes - Quick reference guides for interpreting results Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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