SUCCESS

Week 1 implementation complete. All requirements met:

1. ✅ Added EmitGeneratedMarkers config flag (default: true)
2. ✅ Created MarkerInjector for post-processing marker injection
3. ✅ Integrated marker injection into generator pipeline
4. ✅ Implemented error_propagation marker type
5. ✅ Markers survive go fmt (valid Go comments)
6. ✅ Comprehensive tests created and passing
7. ✅ Architecture extensible for future marker types

Generated Go code now includes:
  // DINGO:GENERATED:START error_propagation
  [generated code]
  // DINGO:GENERATED:END

Ready for Week 2: VSCode extension integration.
