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- Netlify Edge Function sets persistent aud_ab_id cookie for cohort assignment - Deterministic hash (djb2) maps user ID + experiment name to variant slot - Experiment registry with weighted variant support (src/assets/data/experiments.ts) - React hook useExperiment() for component-level variant rendering - Matomo Custom Dimension 1 repurposed for experiment tracking - Sample 'nav-logo' 50/50 experiment: control (logo+text) vs text-only - Unit tests for hash distribution and variant assignment