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Volvo's VIN catalog is a 3-level vin-group.action?group1=…[&group2=…] HTML tree; PL24's json-vin-*-group.action JSON endpoints now 404. Add HTML subgroup extraction (keep links one group-level deeper than the current path) in ford-legacy fetchSubGroupsByPath, and route vin-group.action?group1= nodes through getChildren (drill-first, fall back to parts) in getCategoryWithParts. Recovers Volvo group1→group2 navigation. Leaf parts handled separately. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>