Introduces `RelationshipReordered` change kind and `ReorderSources`
method to allow reordering the source set of a relationship without
removing and re-adding components. This optimizes shuffling operations
like deck setup in Blackjack.
Introduce a new PlayTest project containing tools for simulating
gameplay, including:
- Agent abstractions (IAgent, GreedyAgent, WeightedAgentPool)
- ObservableCapture for logging entity changes
- PlayLog for generating and saving formatted play logs
hypercross