Add support for number enums and enhance request body content handling

[shibayan]

This pull request adds support for OpenAPI number enums (i.e., enums with floating-point values) to the code generator, alongside improvements to request body content type handling. Now, number enums are generated as strongly-typed record structs with appropriate serialization, and JSON request bodies include the correct media type. The changes also include updates to tests to verify these enhancements.

Support for number enums in schema generation:

• Added a new SchemaEnumKind.Number kind and logic to detect and handle number enums in OpenAPI schemas, including proper inference and merging with integer enums. (src/OpenApiWeaver/ClientGenerator.Models.cs [1] src/OpenApiWeaver/ClientGenerator.Transformer.Schemas.cs [2] [3] [4] [5]
• Implemented EmitNumberEnumSchema to generate record struct types for number enums, with custom JSON converter classes for serialization/deserialization. (src/OpenApiWeaver/ClientGenerator.Emitter.Schemas.cs [1] [2] [3]
• Enhanced enum member name and value handling for number enums, including normalization and formatting helpers. (src/OpenApiWeaver/ClientGenerator.Transformer.Schemas.cs [1] [2]

Request body content type improvements:

• Modified request body handling to include the correct mediaType parameter in calls to JsonContent.Create, ensuring the generated code sets the appropriate content type header. (src/OpenApiWeaver/ClientGenerator.Emitter.RequestBodies.cs [1] src/OpenApiWeaver/ClientGenerator.Models.cs [2] src/OpenApiWeaver/ClientGenerator.Transformer.RequestBodies.cs [3]

Test coverage:

• Added and updated tests to verify number enum generation and correct request content type handling, including cases for decimal and double enums. (tests/OpenApiWeaver.Tests/ClientGeneratorTests.SpecCompliance.cs [1] [2] tests/OpenApiWeaver.Tests/ClientGeneratorTests.Operations.cs [3] [4]

These changes improve the generator's standards compliance and type safety, especially for OpenAPI schemas using number enums.

[Copilot]

Pull request overview

This PR enhances the OpenAPI client generator by adding first-class support for number enums (including typeless number enums) and by ensuring generated JSON request bodies set an explicit Content-Type media type.

Changes:

• Add SchemaEnumKind.Number detection/inference and propagate number enum “value type” (decimal/float/double) through the schema model.
• Emit number enums as strongly-typed readonly record struct types with custom JsonConverter serialization/deserialization.
• Include the selected request body content type in JsonContent.Create(..., mediaType: ...) and update tests accordingly.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/OpenApiWeaver/ClientGenerator.Models.cs	Adds SchemaEnumKind.Number and stores request body ContentType in the model.
src/OpenApiWeaver/ClientGenerator.Transformer.Schemas.cs	Detects/infers number enums and normalizes enum member naming/value handling.
src/OpenApiWeaver/ClientGenerator.Emitter.Schemas.cs	Emits number enums as record structs with JSON converters and number literal formatting.
src/OpenApiWeaver/ClientGenerator.Transformer.RequestBodies.cs	Captures the selected request body content type for downstream emission.
src/OpenApiWeaver/ClientGenerator.Emitter.RequestBodies.cs	Emits JsonContent.Create with an explicit mediaType.
tests/OpenApiWeaver.Tests/ClientGeneratorTests.SpecCompliance.cs	Adds coverage for number enums and JSON-family content type handling.
tests/OpenApiWeaver.Tests/ClientGeneratorTests.Operations.cs	Updates expectations to include mediaType: in JSON request body emission.

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