Transfer owned provider settings during resolution

docs/roadmap/implementation.md

@@ -326,6 +326,12 @@ null/empty values, and construction errors without pinning deleted copy-error br
 
 ## Stage 12: Transfer Accepted Provider Maps Through Internal Resolution
 
+**Completed:** Internal selection transfers owned provider maps without repeat
+copies, preserving empty-map inheritance and nil projections; public override
+validation and outward detachment remain. Go 1.27.3 `go test ./internal/usecase
+./internal/configuration . -run 'Target|Profile|Override|Smoke|Provider|ExtraParams'`
+passed.
+
 **Finding:** 5; preserve 8. **Files:** `internal/usecase/runner.go`,
 `profile_inspection.go`, `smoke_selection.go`, related ownership tests.