emex catalogs were seeded from the flat QuickGroups taxonomy (~351
unsearchable leaves on one page). Switch the seeder to the Vehicle.aspx
OEM-microfiche tree (top groups -> sub groups -> Unit.aspx leaves), which
also reaches units that have no QuickGroups gid (e.g. the torque
converter, OEM 5205547 on the Fiesta).
- emex-tree.parser.ts: parseVehicleTree / parseUnitLeaves — pure,
GET-based (per-href ssd, no browser/postback). Unit-tested vs fixtures.
- emex.service: fetchVehicleTree + drillVehicleNode; all 3 decode methods
now populate categoryTree; Unit.aspx leaves fetch parts directly.
- categories.service: revive the dormant tree-insert branch with group
markers (linkWid="emex-group" / hasSubgroups), add an emex getChildren
lazy-drill branch + emex-group parent guard, tighten leaf detection,
disambiguate colliding sub-group names.
- prefetch: emex Vehicle.aspx = parent to drill; Unit/QuickDetails = leaf.
No DDL and no frontend changes — the generic tree UI renders it like
pl24/pcat. Existing flat emex categories re-seed lazily once deleted.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
