fix: parse ABACUS binary options safely

[njzjz-bot]

Summary

• Replace Python eval() with an explicit parser for ABACUS 0/1 and boolean-style values.
• Reuse the safe parser for SCF input generation and init relax/MD gamma_only handling.
• Reject arbitrary expressions with a field-specific error.
• Add a regression test proving a Python payload is not executed.

Tests

• python -m unittest tests.generator.test_abacus_safe_values -v
• ruff check dpgen/generator/lib/abacus_scf.py dpgen/data/gen.py tests/generator/test_abacus_safe_values.py
• ruff format --check dpgen/generator/lib/abacus_scf.py dpgen/data/gen.py tests/generator/test_abacus_safe_values.py
• Confirmed no eval( calls remain in the affected ABACUS paths.

Fixes #1892

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 f822856.

📒 Files selected for processing (3)

• dpgen/data/gen.py
• dpgen/generator/lib/abacus_scf.py
• tests/generator/test_abacus_safe_values.py

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[codecov]

Codecov Report

❌ Patch coverage is 88.88889% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.80%. Comparing base (d5ce577) to head (f822856).

Files with missing lines	Patch %	Lines
dpgen/data/gen.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1949      +/-   ##
==========================================
- Coverage   49.80%   49.80%   -0.01%     
==========================================
  Files          83       83              
  Lines       14986    14982       -4     
==========================================
- Hits         7464     7462       -2     
+ Misses       7522     7520       -2     

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