Runs a full diagnostic of the Python/Kaleido/Xvfb environment used for
static brain map export. Useful for debugging Error 525 and related
Kaleido/Chromium issues on HPC clusters.
Details
Mirrors the same Python setup as plot_vw_surf: calls
py_require() to ensure the uv environment is ready, then
.vw_surf_init_py() to load patch_kaleido.py, and finally
runs the Python sitrep. If Python cannot be initialised at all, a
partial R-side sitrep is printed instead.
