Chronicle.Testing.UnsupportedProjectionOperation exception (cratis_chronicle v3.16.1)

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Raised by Chronicle.Testing.Projections when a read model declares a projection operation the in-memory evaluator does not support — join/2, children/2, from_every/1 and their variants.

These need the server-side projection engine; use Chronicle.Testing.Integration.setup_isolated_client/2 against a real kernel instead of evaluating the projection in memory.