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Comprehensive unit tests for shard management functionality: - GetShard returns correct shard for actor IDs consistently - GetShardNodes returns nodes responsible for each shard - AssignShard correctly updates shard assignments - PlaceActor returns valid nodes from available set - Shard assignment handles node failures gracefully - Replication factor is properly tracked Includes tests for edge cases (empty shards, nil registry, single node) and benchmark tests for GetShard, AssignShard, and PlaceActor. Closes #5 Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>