Release v4.68.1

Fixed

• Generated command handlers now refuse a whole-number stream-id value outside ±9007199254740991, the bound Screenplay applies. They return a validation error naming the property, and no event is appended. Composite stream ids check each part in order before producing any event. Before, a value such as 9007199254740992 became a stream id that Screenplay's reference rejects. (#324)