perf(client): parallelize large existence probes - #280
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Shard RDMA ExistMany groups across the existing read connection fanout and parallelize independent shared-memory ClaimExist probes. On 0064 vLLM with a 94k-token prompt (5,872 keys), scheduler batch_exist fell from 246 ms before this work to 71 ms; full warm request remained ~2.02 s with zero completion errors. All 9 client metrics/dedup/retry tests pass.