Source Generator Test Architecture

Complete Test Coverage for v1.22.0

tests/REslava.Result.SourceGenerators.Tests/
├── OneOf2ToIResult/          # ✅ 5/5 tests passing
├── OneOf3ToIResult/          # ✅ 4/4 tests passing
├── OneOf4ToIResult/          # ✅ 5/5 tests passing
├── OneOfToActionResult/      # ✅ 12/12 tests passing (NEW v1.22.0!)
├── ResultToIResult/          # ✅ 6/6 tests passing
├── ResultToActionResult/     # ✅ 9/9 tests passing (NEW v1.21.0!)
├── SmartEndpoints/           # ✅ 4/4 tests passing
├── CoreLibrary/              # Core utilities tests
├── GeneratorTest/             # Console validation tests
└── Legacy/                    # Historical tests (disabled)