Refactor support type and operation emitters

[shibayan]

Summary

• Split SupportTypesEmitter into focused partial emitters for exceptions, helpers, parameter formatting, query, cookie, and response helpers.
• Add SupportTypeNames to centralize support type reservations and default serializer options references.
• Split OperationEmitter helper logic into focused partial files for error responses, parameters, security, and serialization.

Impact

This is intended to be behavior-preserving. It reduces oversized emitter files and makes the remaining generation responsibilities easier to review and extend.

Validation

• dotnet test OpenApiWeaver.slnx --no-restore
• git diff --check

[Copilot]

Pull request overview

Refactors the code-generation emitters by splitting large emitter classes into focused partial files and centralizing support-type naming/reservations, aiming to keep generated output behavior unchanged while improving maintainability.

Changes:

• Introduced SupportTypeNames to centralize support-type names, reservations, and default serializer-options expression.
• Split OperationEmitter helper logic into partial files (error responses, parameters, security, serialization).
• Split SupportTypesEmitter into partial files grouped by helper/category (exceptions, helpers, parameter formatting, query, cookie, response).

Reviewed changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/OpenApiWeaver/SupportTypeNames.cs	Centralizes support type names, reserved names, and serializer-options naming helpers.
src/OpenApiWeaver/OperationEmitter.cs	Converts to partial and keeps core operation emission, delegating helper logic to partials.
src/OpenApiWeaver/OperationEmitter.ErrorResponses.cs	Moves error-response handling emission into a focused partial file.
src/OpenApiWeaver/OperationEmitter.Parameters.cs	Moves route/query/header/cookie parameter emission helpers into a focused partial file.
src/OpenApiWeaver/OperationEmitter.Security.cs	Moves security requirement/scheme selection helpers into a focused partial file.
src/OpenApiWeaver/OperationEmitter.Serialization.cs	Moves serializer-options expression helper into a focused partial file.
src/OpenApiWeaver/JsonSerializerOptionsEmitter.cs	Uses centralized default serializer-options expression constant.
src/OpenApiWeaver/ClientGenerator.Transformer.cs	Uses centralized serializer-options type naming helper when allocating the options type name.
src/OpenApiWeaver/ClientGenerator.Transformer.Schemas.cs	Uses centralized support-type reservation helper for schema-name reservation.
src/OpenApiWeaver/ClientGenerator.Transformer.Tags.cs	Uses centralized reserved support-type names when reserving client class names.
src/OpenApiWeaver/ClientGenerator.SupportTypesEmitter.cs	Converts to partial and keeps the top-level support-types emission entry point.
src/OpenApiWeaver/ClientGenerator.SupportTypesEmitter.Exceptions.cs	Extracts exception type emission into its own partial emitter.
src/OpenApiWeaver/ClientGenerator.SupportTypesEmitter.Helpers.cs	Extracts helper-class emission and composes helper sections via partial emitters.
src/OpenApiWeaver/ClientGenerator.SupportTypesEmitter.ParameterFormatting.cs	Extracts parameter-formatting helpers into its own partial emitter.
src/OpenApiWeaver/ClientGenerator.SupportTypesEmitter.Query.cs	Extracts query-string helpers into its own partial emitter.
src/OpenApiWeaver/ClientGenerator.SupportTypesEmitter.Cookie.cs	Extracts cookie header helpers into its own partial emitter.
src/OpenApiWeaver/ClientGenerator.SupportTypesEmitter.Response.cs	Extracts response/content-type/status-code/deserialize helpers into its own partial emitter.

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