🛡️ Sentinel: [HIGH] Fix path traversal in io.list_files()

[mleem97]

🚨 Severity: HIGH
💡 Vulnerability: Path traversal (CWE-22) in GregIoLuaModule.cs where the pattern argument of Directory.GetFiles was entirely unsanitized, allowing malicious Lua scripts to escape the data directory using .. and enumerate files elsewhere on the system.
🎯 Impact: Allowed untrusted Lua mods to scan arbitrary directories on the host machine.
🔧 Fix: Added validation to the pattern argument to ensure it does not contain directory traversal characters like .., Path.DirectorySeparatorChar, or Path.AltDirectorySeparatorChar. If invalid, it securely returns an empty table.
✅ Verification: Verified compilation and confirmed safety against traversing paths. Evaluated via dotnet test (net6.0). Added learning to .jules/sentinel.md.

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PR created automatically by Jules for task 17587138135755399030 started by @mleem97

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[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 4 complexity · 0 duplication

Metric	Results
Complexity	4
Duplication	0

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[mleem97]

Superseded: current tree already sanitizes patterns AND enforces sandbox containment (SanitizeSearchPattern + IsInsideSandbox), which is stronger than this guard. No merge needed.

[google-labs-jules]

Superseded: current tree already sanitizes patterns AND enforces sandbox containment (SanitizeSearchPattern + IsInsideSandbox), which is stronger than this guard. No merge needed.

Understood. Acknowledging that this work is now obsolete and stopping work on this task.