removing-a-feature-audit-shared-handles

Delete a feature that duplicates a newer one — two effects on one output multiply — after auditing what else uses the handle the removed feature appeared to own, deleting the no-op stubs on the other platforms, and force-stopping before judging whether the removal worked, because an already-attached external effect outlives the change. Use when replacing a delegating integration with an in-app one, or when a removed…