[python] helpers: import matplotlib only in the plotting functions

[yanissrairi]

pyforefire/__init__.py star-imports helpers, which imported matplotlib at module level, so every import pyforefire loaded it even when nothing is plotted. The imports now live in the two functions that use them, printToPathe and plot_simulation.

Fresh interpreter, median of 30 runs (Python 3.14, matplotlib 3.11):

• import pyforefire: 0.191 s -> 0.039 s
• RSS after import: 80 MB -> 41 MB

This matters when running many short simulations in separate processes.

The helper functions return the same outputs as before, and percolation.py and idealizedwind.py in tests/python produce identical files with a fixed seed. One side effect: plt, cm, mpath, mpatches and ListedColormap are no longer re-exported by pyforefire through the star import. Nothing in this repository relies on that.

[filippi]

thanks @yanissrairi
@HugoFara doues this collides with the new python interface with runners ? i beleive not, but cannot check yet if that is implemented in dev.

[HugoFara]

@filippi not a problem on my side. I don't have PRs open to dev now, so there won't be conflicts. Good work @yanissrairi !

[antonio-leblanc]

team aproved