- Always try to register the device and just return gracefully if it
fails (prevents races, pagination issues)
- Allow `SigningContext` (and therefore `AutoSigner`) to be created
without a target device: just skip device registration.
- Make some enums non-exhaustive (closes#77)
- Also a tentative fix for #62 and #64
- Improve logging on deserialization failure
We now use raw JS to patch the OpenAPI spec instead of openapi-overlay.
It's a lot more flexible this way.