Summary

Deepens the InterfaceGenerator module by extracting three focused generators, each independently testable. The public API is unchanged — all existing tests (2184) pass.

Changes

• IReturnTypeGenerator/ReturnTypeGenerator — return type derivation, IApiResponse wrapping, Task/IObservable selection, file stream detection, response type override
• IMethodAttributeGenerator/MethodAttributeGenerator — Accept/Content-Type/Authorization headers, [Multipart], [Obsolete]
• IMethodSignatureGenerator/MethodSignatureGenerator — parameter aggregation (delegates to ParameterAggregator), optional parameter reordering, dynamic querystring
• IMethodGenerator/MethodGenerator — facade composing the three sub-generators
• InterfaceGenerator — reduced from 450→253 lines by delegating to IMethodGenerator

Module Structure

IMethodGenerator
├── IReturnTypeGenerator      — return type derivation
├── IMethodAttributeGenerator — method-level attributes
├── IMethodSignatureGenerator — method name + parameters
└── InterfaceGenerator (deepened, delegates to IMethodGenerator)

Testing

25 new unit tests across the three generators (ReturnTypeGeneratorTests, MethodAttributeGeneratorTests, MethodSignatureGeneratorTests). All 2184 existing tests pass unchanged.