Parser already handles `:` syntax correctly via TypeAnnotProcessor. Real blocker: missing enum preprocessor causes parse errors on `enum` keyword. Result type plugin is complete but not activated in pipeline. Plan: (1) Add enum preprocessor to transform `enum { ... }` to Go sum types (4-6 hrs), (2) Activate plugin pipeline to enable Result type transformations (6-8 hrs). Total: 10-14 hours for full end-to-end integration.
