Make visibility pruning test deterministic

[lola831]

Description

This updates test_visibility_pruning to reduce flakiness. The test previously relied on random sampling to hit the outer valid band of the pruned region, which could occasionally fail even when pruning was correct. It now checks the conditioned/pruned region directly to confirm that the outer band is still available, while still verifying that sampled positions stay within the expected distance bounds.

Issue Link

N/A

Checklist

• I have tested the changes locally via pytest and/or other means
• I have added or updated relevant documentation
• I have autoformatted the code with black and isort
• I have added test cases (if applicable)

Additional Notes

N/A

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.72%. Comparing base (07625cb) to head (009ccfc).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #447      +/-   ##
==========================================
+ Coverage   89.66%   89.72%   +0.06%     
==========================================
  Files          48       48              
  Lines       13193    13194       +1     
==========================================
+ Hits        11829    11838       +9     
+ Misses       1364     1356       -8     

see 7 files with indirect coverage changes

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