feat(bench): add concurrent-read and WAL sync-mode benchmarks#98
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BM_ConcurrentRead measures aggregate read throughput vs reader-thread count, exercising the reader-writer locking on the shared index and block cache. BM_WalSyncWrite measures write throughput under each WAL sync mode (ALWAYS/NORMAL/OFF), quantifying the durability/speed tradeoff.
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BM_ConcurrentRead measures aggregate read throughput vs reader-thread count, exercising the reader-writer locking on the shared index and block cache. BM_WalSyncWrite measures write throughput under each WAL sync mode (ALWAYS/NORMAL/OFF), quantifying the durability/speed tradeoff.