Volvo (VIN-indexed legacy catalog) ships its real top groups as
vin-group.action?group1=… in the vin-group HTML. PL24's
json-vin-main-group.action endpoint now 404s, so decode falls back to the
HTML scrape — but parseP4NavigationCategories AND the seed-time NAV_CRUMB
filter both blanket-exclude vin-group.action, dropping every real Volvo
group → 0 categories. Exclude vin-group.action as a crumb only when it
lacks group1=. Confirmed upstream: 7 real groups (Frenler, Elektrik
sistemi, …) present in the HTML for YV1AS7050A1118639.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>