fix(vasp): skip malformed OUTCAR force frames

[njzjz-bot]

Fixes #611.

Parse TOTAL-FORCE blocks transactionally and skip separator/truncated ionic frames while retaining valid frames.

Tests: cd tests && python -m unittest test_vasp_outcar

Why existing tests missed it: All prior OUTCAR fixtures had complete numeric force tables; separators and EOF truncation were absent.

Coding agent: Codex
Codex version: codex-cli 0.144.4
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 0416b54 and 335920f.

📒 Files selected for processing (2)

• dpdata/formats/vasp/outcar.py
• tests/test_vasp_outcar.py

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[codspeed-hq]

Merging this PR will improve performance by 20.15%

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 2 improved benchmarks

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	WallTime	test_import	11.8 ms	9.6 ms	+22.37%
⚡	WallTime	test_cli	386.7 ms	327.8 ms	+17.97%

Tip

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_{Comparing njzjz-bot:fix/issue-611 (335920f) with master (0416b54)}

[codecov]

Codecov Report

❌ Patch coverage is 95.65217% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 86.89%. Comparing base (0416b54) to head (335920f).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
dpdata/formats/vasp/outcar.py	95.65%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1030      +/-   ##
==========================================
+ Coverage   86.87%   86.89%   +0.01%     
==========================================
  Files          89       89              
  Lines        8266     8284      +18     
==========================================
+ Hits         7181     7198      +17     
- Misses       1085     1086       +1     

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