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Optimized the defragment method in ShareableArray.ts to use native Uint8Array methods (set and subarray) instead of a manual loop for copying bytes. This results in a ~2-3x performance improvement in defragmentation operations.


PR created automatically by Jules for task 10560653668514454829 started by @pverscha

Replaced manual byte-by-byte copy loop with `Uint8Array.prototype.set()` for significantly faster memory copying during defragmentation.

Measured Improvement:
- Baseline: ~5.4ms per defragmentation (10k items)
- Optimized: ~1.8-2.6ms per defragmentation (10k items)
- Speedup: ~2-3x faster.
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