perf(snapshots): Parallelize image hashing with rayon#3250
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Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Use rayon's par_iter to hash all images concurrently instead of sequentially. Also increase the hash read buffer from 8KB to 64KB to reduce syscall overhead. Reduces hashing time from 5.3s to 0.8s (6.6x speedup) on a 753-image / 99MB dataset.