OpenAPI Overlays for SDK Generation Prep: Fixing a Spec Before Codegen

Every time I run a code generator against a real OpenAPI document, the output tells me something ugly about how the spec was written. I get a method called get_products hanging off a client with no namespace, a status field typed as a loose string so the SDK hands me a stringly-typed free-for-all, and operations scattered flat across the client because nobody tagged them. That is not the generator’s fault.