Drop the Share-diagnostics preference, its Settings toggle and the
DiagnosticsBuildConfig stub. Bug reporting (NoopBugReportService) and the
diagnostics install id used for bug-report correlation are retained.
Add strict custom Iroh relay profiles with safe restart and rollback across the Rust core, Compose apps, and Apple apps. Preserve multi-relay invitations and fail closed on configuration or recovery mismatches.
- Introduce a CoreGateway protocol so feature models depend on a seam
(CoreRepository conforms); enables faking the core in tests
- Add a VniDropTests target with 42 tests mirroring the KMP suites:
approval coordinator, send/receive/settings/app models, preferences,
file previews, invitation decode, message queue, error mapping
- Add a fake gateway/file-system/device-info and fixtures
- Add .github/workflows/apple.yml: build the Rust core, generate the
project, and run the tests on an iOS Simulator
