Use ConfigKit mapping values directly

docs/roadmap/implementation.md

@@ -93,6 +93,10 @@ source-helper GoDoc and source/construction contract tests.
 capture and deferred upstream diagnostics, not acceptance of `json.Number`,
 typed containers, named scalars, or nested pointers by the removed adapter.
 
+Completion: convenience sources pass provider maps directly to ConfigKit;
+the converter was removed. Focused source and construction tests passed with
+Go 1.27.3, including nested capture and deferred unsupported/cyclic errors.
+
 ## Stage 3: Represent The Owning Error Operation
 
 **Catalog:** 7, first part. **Files:** use-case error/runner/preparation boundaries.