v0.8.31

• QueryRunnerStatus singleton for thread-safe live stats
• Connection summary table after ramp-up
• Periodic 60s progress reports with min/avg/max latency
• QueryRunnerLogger: lock-free dual console+file logging via BlockingCollection
• Async file write overlapped with synchronous Console.WriteLine
• Log file opened with FileShare.Read for live tailing
• All console output timestamped