No pandas

[pdziekan]

No description provided.

[Copilot]

Pull request overview

This PR removes the pandas dependency from the Python condensation-substepping test/utility scripts by switching CSV IO and comparisons to the standard library (csv), and refreshes the stored reference CSV accordingly.

Changes:

• Replace pandas DataFrame CSV writing in lgrngn_cond_substepping.py with a csv.DictWriter-based helper.
• Replace pandas/numpy-based CSV loading/merge/compare logic in lgrngn_cond_substepping_test.py with pure-stdlib row matching and tolerance checks.
• Replace pandas-based plotting input in lgrngn_cond_substepping_plot.py with csv.DictReader parsing; update the reference CSV dataset.

Reviewed changes

Copilot reviewed 3 out of 12 changed files in this pull request and generated 3 comments.

File	Description
tests/python/physics/refdata/lgrngn_cond_substepping_refdata.csv	Updated reference dataset to match the new CSV writing/serialization and current outputs.
tests/python/physics/lgrngn_cond_substepping.py	Drops pandas and adds _write_csv() to persist records via csv.DictWriter.
tests/python/physics/lgrngn_cond_substepping_test.py	Drops pandas/numpy and reimplements CSV comparison by config-key mapping and manual tolerance checks.
tests/python/physics/lgrngn_cond_substepping_plot.py	Drops pandas and reimplements grouping/plot data extraction from CSV rows.

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