🔒 [security fix directory traversal in tar unpack]

[Tcode-Motion]

🎯 What: Fixed a directory traversal vulnerability in the untar_archive function within stdlib/src/compress.rs.
⚠️ Risk: The previous implementation used the top-level Archive::unpack method, which could potentially allow extraction of files outside the intended destination directory (e.g., via absolute paths or .. traversals in filenames) if not properly protected, leading to arbitrary file overwrite vulnerabilities.
🛡️ Solution: Modified the extraction logic to iterate over the archive entries and call Entry::unpack_in explicitly on each one, enforcing the built-in directory traversal protections. Included cleanup of temporary testing files to ensure repository hygiene.

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PR created automatically by Jules for task 2200096652374879433 started by @Tcode-Motion

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