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Keeps the non-obvious rationale (pod naming, repository injection, one-shot
promise settling, optional guards) and drops restatements of what the code
already shows.

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.