Cache view context instance per store#28
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Follow-up to #27.
InMemoryModelStorage.viewContextnow returns a single cachedInMemoryViewContextinstance per store instead of constructing a fresh one on every access, matching the caching pattern used byNSPersistentContainer.viewContext. The cache uses anonisolated(unsafe)property populated lazily from the@MainActorgetter, so all access is main-actor confined. Guarded out under Embedded Swift.testSharedDataWithStoreadditionally assertscontext === store.viewContext.