Contract post processing adapters in GeneratorPipeline

[christianhelle]

Summary

Implements PRD #2: GeneratorPipeline — Replacing Inline Dependencies with Injected Seams.

Changes

• New: \IContractsPostProcessor\ interface for composable post-generation contract transforms
• New: \Swagger2OptionalReferenceNullabilityNormalizer\ — normalizes Swagger 2.0 optional reference type nullability (extracted from \GeneratorPipeline.NormalizeSwagger2OptionalReferencePropertyNullability)
• New: \EnumStringConverterInjector\ — injects \JsonStringEnumConverter\ attributes on enum declarations (extracted from \GeneratorPipeline.SanitizeGeneratedContracts)
• Refactor: \GeneratorPipeline\ now accepts \XmlDocumentationGenerator, \InterfaceGenerator, and \IEnumerable\ via constructor injection instead of creating them inline with
  ew\
• Refactor: Three \internal static\ helpers (\SanitizeGeneratedContracts, \NormalizeSwagger2OptionalReferencePropertyNullability, \GenerateJsonSerializerContext) removed from \GeneratorPipeline's public surface — the first two live as post-processors, the third stays as a private method in \Run()\
• Refactor: \RefitGenerator.RunPipeline()\ constructs the pipeline with real dependencies; private wrapper methods removed
• Test: All affected tests updated to use the new API directly instead of reflection

Verification

• ✅ Build succeeds with zero errors
• ✅ All 2152 tests pass across all three test projects

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (improve-codebase-architecture@7d03c6a). Learn more about missing BASE report.

Additional details and impacted files

@@                       Coverage Diff                        @@
##             improve-codebase-architecture    #1138   +/-   ##
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  Coverage                                 ?   94.75%           
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  Files                                    ?       41           
  Lines                                    ?     2669           
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  Hits                                     ?     2529           
  Misses                                   ?       46           
  Partials                                 ?       94           

Flag	Coverage Δ
unittests	94.75% <100.00%> (?)

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