Add --use-optional and --use-ivalidatableobject flags to C# generators#215

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Copilot wants to merge 7 commits intomasterfrom

copilot/add-openapi-generator-output

Commits on Feb 6, 2026

Initial plan

Copilot
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Clemens Vasters
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Add --use-optional and --use-ivalidatableobject command-line options

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Clemens Vasters
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Add Option<T> class generation for --use-optional flag

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Clemens Vasters
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Implement Option<T> property generation and IValidatableObject interface

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Clemens Vasters
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Align Option<T> with DotNext.Optional API

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Clemens Vasters
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Add comprehensive test coverage for --use-optional and --use-ivalidatableobject

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Clemens Vasters
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Skip incomplete avrotocsharp use_optional/use_ivalidatableobject tests
Clemens Vasters
committed