fix: exclude VASP data generator from pytest

[njzjz-bot]

Summary

• rename the VASP fixture generator so it no longer matches pytest collection patterns
• move generation into a documented main() function
• import cellpar_to_cell directly instead of relying on ase.geometry as a module attribute

Tests

• pytest --collect-only -q tests/fp/data.vasp.kp.gf (no tests collected, no import-time failure)
• ruff format --check tests/fp/data.vasp.kp.gf/make_kp_data.py
• isort --check-only tests/fp/data.vasp.kp.gf/make_kp_data.py
• git diff --check

Closes #361

Coding agent: Codex
Codex version: codex-cli 0.149.0
Model: gpt-5.6-sol
Reasoning effort: xhigh

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📥 Commits

Reviewing files that changed from the base of the PR and between 6b01f29 and 9e16f04.

📒 Files selected for processing (2)

• tests/fp/data.vasp.kp.gf/make_kp_data.py
• tests/fp/data.vasp.kp.gf/make_kp_test.py

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.43%. Comparing base (6b01f29) to head (9e16f04).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #387   +/-   ##
=======================================
  Coverage   84.43%   84.43%           
=======================================
  Files         104      104           
  Lines        6110     6110           
=======================================
  Hits         5159     5159           
  Misses        951      951           

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