SOLID Design (v1.9.4+)

Each generator is split into three focused classes following SRP:

Class Responsibility
*Generator (e.g. ResultToIResultGenerator) Entry point — thin [Generator] wrapper, delegates to orchestrator
*Orchestrator Coordinates pipeline — registers Phase 1 + Phase 2
*AttributeGenerator Emits the [GenerateResultExtensions] / [AutoGenerateEndpoints] etc. attribute
*ExtensionGenerator / *CodeGenerator Emits the actual extension methods

This eliminates duplicate generation (CS0101/CS0579 errors) and makes each piece independently testable.