`@immutable` lives in `package:meta/meta.dart` (transitive via the
flutter SDK); the file was importing `package:flutter/foundation.dart`
purely for that annotation, which pulls all of Flutter into the
transitive graph. Test files reaching DaemonBus / DaemonEvent through
`dart test` (not `flutter test`) then fail to compile because Flutter's
foundation depends on `dart:ui` types absent from the standalone VM.
Same spirit as 5cad982 — types that get touched by the IPC layer must
not drag the engine in.
Co-Authored-By: Claude <noreply@anthropic.com>
jpmschweitzerandClaude
fad539ca63