Hugo Nijhuis 53576d6f04 Add ShardManager unit tests ...

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>

2026-01-10 23:47:11 +01:00

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