vehicle_from_template.py now authors the physics mesh from the real hot hatch: apply
the mirror/nodes modifiers, derive the 4 wheel centres, add a root + 4 wheel bones,
weight and export vehicle_skeletal.fbx. A rotation orients the car so it imports
unrolled (length +X, width +Y, height +Z); wheel bones land at front +X, rear -X,
left/right +/-Y. The vehicle still floats (rises to 33 m) - recorded in MEMORY.
zwitschi
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