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receive: Support percentage-based shard_size for shuffle sharding (rendezvous only)#310
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…ndezvous only) Add a ShardSize type that accepts both integer (e.g. 6) and percentage string (e.g. "50%") in JSON config. For the rendezvous algorithm, percentage resolves directly against per-AZ common shard count (max(1, len(commonShards) * pct)), bypassing the totalShardSize/numAZs division. Ketama path remains integer-only and rejects percentages with a clear error. Co-authored-by: Isaac
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Add a ShardSize type that accepts both integer (e.g. 6) and percentage string (e.g. "50%") in JSON config. For the rendezvous algorithm, percentage resolves directly against per-AZ common shard count (max(1, len(commonShards) * pct)), bypassing the totalShardSize/numAZs division. Ketama path remains integer-only and rejects percentages with a clear error.
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