🛡️ Sentinel: [CRITICAL] Fix Path Traversal in Lua list_files

[mleem97]

🚨 Severity: CRITICAL
💡 Vulnerability: The list_files Lua API in GregIoLuaModule.cs passed an unsanitized user-provided pattern directly to Directory.GetFiles with SearchOption.AllDirectories.
🎯 Impact: Malicious Lua scripts could exploit this by passing traversal patterns (e.g., ../../secret.txt) to bypass the data directory sandbox and enumerate or read arbitrary files on the host filesystem.
🔧 Fix: Added validation to the searchPattern to securely reject patterns containing .., Path.DirectorySeparatorChar, or Path.AltDirectorySeparatorChar. If a traversal attempt is detected, it logs an error and safely returns an empty Lua table.
✅ Verification:

• Patched the logic in GregIoLuaModule.cs.
• Verified the fix via git diff.
• Ran the test suite using export DOTNET_ROLL_FORWARD=Major; dotnet test tests/gregCore.Tests.csproj. The build succeeded and there were no new regressions.
• Logged the learning into .jules/sentinel.md and staged it.

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PR created automatically by Jules for task 5561698945807031164 started by @mleem97

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[codacy-production]

Up to standards ✅

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