Refactor small maintainability issues in transformations, fake-value resolution and Irish PPSN generation

[tawratnibir]

Summary

This pull request makes a small set of maintainability-focused refactorings:

• Replaces raw Class usage in JavaObjectTransformer.apply() with Class<?> and typed instanceof handling.
• Removes an unreachable dotIndex == -1 branch from the private FakeValuesService.resolveFakerObjectAndMethod() helper.
• Removes a misleading expression-resolution comment that referred to indexOf() while the code uses contains("}").
• Extracts the Irish PPSN weighted checksum calculation into a private helper method.

Why

These changes address small maintainability issues found during source inspection. They improve type clarity, remove unreachable control-flow noise, align comments with the current implementation, and separate checksum calculation from the high-level PPSN generation workflow.

The changes are intentionally small and avoid public API or generic-contract redesign.

Refactoring approach

The refactoring was kept local to the affected implementation details:

• JavaObjectTransformer.apply() now uses Class<?> to represent an unknown class type more safely.
• FakeValuesService.resolveFakerObjectAndMethod() now reflects the verified private helper call contract more directly.
• FakeValuesService.resolveExpression() no longer contains a stale implementation-specific comment.
• IrishIdNumber.generateValid() now delegates weighted checksum accumulation to calculateWeightedSum(...), while preserving the existing weights, suffix handling, multiplier, checksum character calculation and output format.

Validation

The following validation was performed:

• JavaObjectTransformerTest and JavaObjectTransformerConstructorTest passed.
• FakeValuesServiceTest passed.
• IrishIdNumberTest passed.
• Full Maven verification passed with:

./mvnw -Dgpg.skip=true clean verify

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 90.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 92.52%. Comparing base (2f057eb) to head (7383fed).
⚠️ Report is 15 commits behind head on main.

Files with missing lines	Patch %	Lines
...tafaker/transformations/JavaObjectTransformer.java	50.00%	0 Missing and 1 partial ⚠️
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Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1871      +/-   ##
============================================
+ Coverage     92.45%   92.52%   +0.06%     
- Complexity     3557     3563       +6     
============================================
  Files           345      346       +1     
  Lines          7025     7050      +25     
  Branches        685      685              
============================================
+ Hits           6495     6523      +28     
+ Misses          366      364       -2     
+ Partials        164      163       -1     

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