Error schema

We use standard HTTP response codes for success and failure notifications, and our errors are further classified by error_type. In general, 200 HTTP codes correspond to success, 40X codes are for developer- or user-related failures, and 50X codes are for Deck-related issues.


`error_category` A broad categorization of the error. Safe for programmatic use.	string
`error_code` The particular message code. Safe for programmatic use.	string
`error_message` A developer-friendly representation of the error code. This may change over time and is not safe for programmatic use.	string
`display_message` A user-friendly representation of the error code. `null` if the error is not related to user action. This may change over time and is not safe for programmatic use.	string