fix: retrieve ABACUS autotest outputs

[njzjz-bot]

Summary

• Retrieve the OUT.ABACUS directory from remote autotest calculations.
• Preserve the completion logs, final structures, and result files used by task collection and post-processing.
• Add regression coverage for the ABACUS backward-file contract.

Tests

• python -m unittest tests.auto_test.test_abacus.TestABACUS.test_backward_files -v
• ruff check dpgen/auto_test/ABACUS.py tests/auto_test/test_abacus.py
• ruff format --check dpgen/auto_test/ABACUS.py tests/auto_test/test_abacus.py

Fixes #1897

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

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Run ID: fc69811c-d263-4edf-ad73-c7bd830c0d91

📥 Commits

Reviewing files that changed from the base of the PR and between d5ce577 and c22d5d4.

📒 Files selected for processing (2)

• dpgen/auto_test/ABACUS.py
• tests/auto_test/test_abacus.py

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 49.81%. Comparing base (d5ce577) to head (c22d5d4).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1944   +/-   ##
=======================================
  Coverage   49.80%   49.81%           
=======================================
  Files          83       83           
  Lines       14986    14986           
=======================================
+ Hits         7464     7465    +1     
+ Misses       7522     7521    -1     

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