Fix AbsoluteMin comparison by absolute magnitude

[kush2439p]

Summary

• compare candidates by absolute magnitude and return the original signed value
• preserve the existing deterministic tie behavior by choosing the numerically smaller value
• add coverage for mixed signs, both-negative, both-positive, equal magnitudes, and zero

Root cause

AbsoluteMin.getMinValue filtered candidates using their absolute values, but then updated the result with Math.min on the raw signed values. A larger-magnitude negative number could therefore replace the correct candidate.

Validation

• javac compilation and direct behavior checks passed
• git diff --check passed
• mvn -Dtest=AbsoluteMinTest test reached test compilation, but the upstream checkout has unrelated missing-class compilation failures across existing tests before Surefire can select the focused test

Fixes #7537

[kush2439p]

This PR corrects AbsoluteMin.getMinValue to compare values by absolute magnitude while returning the original signed value.
It also documents deterministic tie handling (the numerically smaller value is chosen) and adds tests for mixed signs, negative values, positive values, ties, and zero.
Validation:
Checkstyle passed
Direct behavior checks passed
Full Maven test compilation is currently blocked by unrelated missing classes in the upstream checkout.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.31%. Comparing base (8a20fa9) to head (c53c00b).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #7540      +/-   ##
============================================
- Coverage     80.32%   80.31%   -0.01%     
- Complexity     7402     7404       +2     
============================================
  Files           812      812              
  Lines         23911    23915       +4     
  Branches       4704     4706       +2     
============================================
+ Hits          19206    19208       +2     
- Misses         3944     3945       +1     
- Partials        761      762       +1     

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