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Verified against the MyID backend: a non-UUID sessionId is rejected with code
103 before the SDK UI appears.

Three paths overwrote SDK defaults instead of leaving them alone:

- iOS assigned every appearance color unconditionally, so theming one color
  nil-ed the other eleven. MyIdAppearance seeds its own values.
- An organizationDetails carrying only a logo replaced the whole details object,
  clearing the default call-centre number. It is now forwarded only when the
  caller supplied a field, and each field is assigned individually.
- An unrecognised enum value called the setter with a guessed default. The guess
  was not always right: the SDK defaults imageFormat to JPEG while the fallback
  substituted PNG. Unknown values now skip the setter.

Android settled a promise through a plain field touched by the JS, UI and
native-modules threads, giving neither visibility nor an atomic check-then-set;
a reload racing a start could wedge the module for the rest of the process. It
is now an AtomicReference claimed with compareAndSet, and the result listener is
scoped to a flow id so a late duplicate callback cannot settle a newer promise.

iOS gained the invalidate path Android already had, confines its state to the
main queue, and extends the proxy's lifetime across the settle callback that
releases it.

Documented defaults corrected against MyIdDefaults: imageFormat is JPEG,
withSoundGuides is true, distance depends on camera shape, iOS floor is 15.1.

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.