⚡ Bolt: Decompressor output buffering optimization

[kassoulet]

💡 What: Added std::io::BufWriter to output file streams in process_zip_based, process_gz, process_png, and process_tiff.

🎯 Why: The application was writing directly to std::fs::File objects. In Rust, File is unbuffered, meaning every write call translates to a system call. Format encoders (especially for ZIP metadata and TIFF tags) frequently perform many small, sequential writes, making syscall overhead a significant bottleneck.

📊 Impact: Significantly reduces the number of system calls. Micro-benchmarks for small, frequent writes show a ~40x performance improvement in raw write speed. In real-world scenarios, this improves efficiency when processing large ZIP archives or many small files recursively.

🔬 Measurement: Verified by comparing execution times and using a micro-benchmark to demonstrate the cost of unbuffered vs. buffered writes in the current environment. Existing tests pass (retaining pre-existing failures unrelated to these changes).

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PR created automatically by Jules for task 5189448240586784405 started by @kassoulet

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