perf(bench): avoid cloning scheduling keys for ready sends - #201
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Skip cloning the active scheduling keys when the send queue is empty or its first transaction is ready, preserving the existing ordered scan when it is blocked. In a local optimized microbenchmark with 5,000 active keys, ready-front selection fell from about 2.49 µs to 10.4 ns per call; this measures queue selection only, not node throughput.