Release v15.34.9

Fixed

• [RemovedWith<T>] on a child collection type now actually removes the item from the collection. Its key expression was stored verbatim (e.g. RoleId) while the projection's other keys are camelCased, so it never matched the serialized event content and no removal was produced. (#135)
• In-memory read models now apply child removals — the in-memory sink silently ignored ChildRemoved changes (the MongoDB and SQL sinks already handled them).