feat(vehicle): the car renders, built from the owner's hot hatch template

The invisible-vehicle defect is closed. Shot 9 now shows the car instead of an empty road.

Tools/vehicle_from_template.py converts Art/blender/vehicle/hot hatch.blend into UE-ready
assets, following two skills:

  vehicle-artist - systems split (body 113k tris, trim 10.5k, glass 20.5k, lights 18.6k,
  wheels 47.8k), one UCX_ hull 1.45 x 3.94 x 0.76 m, two decimated LODs at 39.7k and 13.6k.
  unreal-export - scale normalised to a documented 4.05 m hot hatch before export (the
  template measures 7.26 m, factor 0.5579), then verified after import: body bounds
  1.51 x 4.02 x 1.22 m against the 4.05 m target.

Staged as five plain StaticMeshActors, because the earlier probe proved those render while
the same meshes attached to the vehicle pawn do not.

Open and recorded rather than hidden: judge_screenshot returns verdict=no confidence=0.9 -
the silhouette does not read as a hot hatch from this angle and the car floats slightly.
The likely causes are a system misclassification in the template conversion and an
origin-height error of a few centimetres.

Tools/ue_vehicle_import.py

@@ -16,14 +16,13 @@ import os
 import unreal
 
 DEST = "/Game/Hollywood/Vehicle"
-SOURCE = "/tmp/gigline/vehicle"
+SOURCE = "/tmp/gigline/hatch"
 SYSTEMS = (
     ("body", "SM_Vehicle_Body"),
+    ("trim", "SM_Vehicle_Trim"),
     ("glass", "SM_Vehicle_Glass"),
-    ("light_front", "SM_Vehicle_Light_Front"),
-    ("light_rear", "SM_Vehicle_Light_Rear"),
-    ("mirrors", "SM_Vehicle_Mirrors"),
-    ("wheel", "SM_Vehicle_Wheel"),
+    ("lights", "SM_Vehicle_Lights"),
+    ("wheels", "SM_Vehicle_Wheels"),
 )
 RESULT = "/tmp/gigline/vehicle-import.txt"
 lines = []
@@ -103,7 +102,8 @@ def main():
         log(f"{name}: imported as its own asset ({'ok' if mesh else 'MISSING'}); "
             "LOD group wiring needs an editor session")
 
-    # Skeletal vehicle for Chaos: a root bone plus one bone per wheel, everything skinned.
+    # Skeletal vehicle for Chaos is not built from this template yet: the hatch is a
+    # static model, and the drivable rig has to be authored around it.
     skel_path = os.path.join(SOURCE, "vehicle_skeletal.fbx")
     if os.path.exists(skel_path):
         task = unreal.AssetImportTask()