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ObjC++ flattens the codegen C++ param structs into NSDictionary, since Swift
cannot see them, and delegates to a Swift layer that owns all SDK interaction.

The pod is named RNMyidSdk rather than MyidSdk: the latter differs from the
vendor pod MyIdSDK only by case, and on a case-insensitive filesystem the two
targets share one intermediate build directory, so the generated Swift header
lands in the vendor's directory and the bridge fails to import it.

MyIdClientDelegate conformance is kept on an internal proxy so it is not
re-emitted into the generated Swift header, which ObjC++ parses without any
visibility of MyIdSDK's Swift types.

Public surface is a promise-based start({config, iosAppearance}) mirroring the
MyID Flutter plugin's wire format, with string-union enums, platform-scoped
JSDoc and a MyIdError carrying the SDK result code.

The codegen spec stays deliberately untyped for enums because codegen cannot
express string unions; narrowing lives in the public layer only. Keys that are
undefined are stripped before crossing the bridge so the SDK's own defaults
survive rather than being overwritten with empty values.

Repo becomes the myid-sdk npm package: library at root, RN 0.86.2 vanilla
example app in example/, Turbo Module codegen enabled, yarn 4 workspace.

The previous demo app targeted MyID SDK 2.x (clientId, withPassportData,
MyIdBuildMode), an API that no longer exists in 3.x, so it is removed rather
than migrated. Recoverable via the pre-rewrite tag.