Scales the default transverse width (xywidth 50->200 cm) and every
layer thickness across the example/production geometries (run_pbwo4,
example.py/ipynb, run_sampling configs, export_xsec) by the same
factor, so the calo grows uniformly in x, y, and z.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>