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scenarioSimilarity now uses synonym-set cross-matching: if GT says "durchschlaegt" and Engine says "schleuder", the synonym set recognizes them as related. Added significantWordOverlap fallback when no action words found. Extended action terms: schlauch/druck/kuehlschmierstoff, pumpe/bettspuel, potential/bezugspotential, stoerung/emv. Moved extractActionWords to benchmark_synonyms.go (458+119 lines). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>