fix: avoid forwarding root-level VASP inputs

[njzjz-bot]

Summary

• stop declaring task-local VASP inputs as submission-root common files;
• continue forwarding INCAR, POSCAR, KPOINTS, and POTCAR from each task directory;
• cover all affected autotest property types with regression tests.

Tests

• /tmp/dpgen-test-env/bin/python -m unittest tests.auto_test.test_vasp -v
• ruff check dpgen/auto_test/VASP.py tests/auto_test/test_vasp.py
• ruff format --check dpgen/auto_test/VASP.py tests/auto_test/test_vasp.py

Fixes #1139

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 d5ce577 and f2a00a7.

📒 Files selected for processing (2)

• dpgen/auto_test/VASP.py
• tests/auto_test/test_vasp.py

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 49.83%. Comparing base (d5ce577) to head (f2a00a7).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1955      +/-   ##
==========================================
+ Coverage   49.80%   49.83%   +0.02%     
==========================================
  Files          83       83              
  Lines       14986    14981       -5     
==========================================
+ Hits         7464     7466       +2     
+ Misses       7522     7515       -7     

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