Set 0o444 file permissions for snapshot files

[SamuelSarle]

Resolves asimov-platform/asimov-snapshot-cli#9

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@artob	3

Your contribution is much appreciated with a final score of 3!
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[isaac-asimov-bot]

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[Copilot]

Pull Request Overview

This PR implements setting read-only file permissions (0o444) for snapshot files and URL metadata files to prevent accidental modification. It also improves cross-platform compatibility by adding Windows-specific logic to handle read-only file deletion.

• Replaces simple file writes with explicit file creation and permission setting
• Adds Windows-compatible file deletion logic that handles read-only files
• Refactors test code to use unwrap() instead of returning Result<()>

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🥁 Score it!

@artob, please score the PR with @race-of-sloths score [1/2/3/5/8/13]. The contributor deserves it.
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[artob]

@race-of-sloths score 3