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When creating a `pulumi.dynamic.Resource`, how unique does the `id` returned from the `create` method have to be? Should it look like the Pulumi urn strings (i.e. `urn:pulumi:prod::vm-scaler::pulumi:pulumi:Stack::vm-scaler-prod`)?

Are there any character restrictions on the `id`?

I do not believe Pulumi itself enforces and character restrictions on `id`. I believe it is an opaque string. 

It is intended for your use - not Pulumi’s. The main goal is that your create can return an `id`, and that `id` will get passers back to calls like `delete` so that you can delete the right resource in the backing cloud provider. 