fix: select the minimum interstitial distance

[njzjz-bot]

Summary

• Filter the interstitial distance matrix to positive values and take the explicit minimum.
• Raise a clear error if a distance matrix contains no positive distances.
• Add deterministic regression coverage independent of set iteration order.

Tests

• python -m unittest tests.auto_test.test_interstitial_distance -v
• ruff check dpgen/auto_test/Interstitial.py tests/auto_test/test_interstitial_distance.py
• ruff format --check dpgen/auto_test/Interstitial.py tests/auto_test/test_interstitial_distance.py

Fixes #1902

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 1d20776.

📒 Files selected for processing (2)

• dpgen/auto_test/Interstitial.py
• tests/auto_test/test_interstitial_distance.py

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[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 49.81%. Comparing base (d5ce577) to head (1d20776).

Files with missing lines	Patch %	Lines
dpgen/auto_test/Interstitial.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1940      +/-   ##
==========================================
+ Coverage   49.80%   49.81%   +0.01%     
==========================================
  Files          83       83              
  Lines       14986    14992       +6     
==========================================
+ Hits         7464     7469       +5     
- Misses       7522     7523       +1     

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