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Introduce GpuTimingData, SummaryComparison, ComparisonStats, and ComparisonRunData to make timing extraction, classification, and run-level state explicit. Load sample-time and SM-frequency bulk data from JSON binary output into GpuTimingData when available, preserving count validation between paired sample and frequency arrays. Move GPU timing comparison logic into compare_gpu_timings(), prefer robust median/IQR data when available, and fall back to mean/stdev summaries otherwise. Keep missing or invalid noise on the unknown path. Replace module-level comparison counters and selected-device globals with per-run data passed into compare_benches(). Update tests to validate timing classification, bulk-data loading, device pairing, filtered duplicate matching, and summary counters through the new structures.