🛡️ Sentinel: [HIGH] Fix Path Traversal Vulnerability

[acebytes]

🚨 Severity: HIGH
💡 Vulnerability: The StatusSocket daemon accepted user-provided file paths for configuration validation (handleValidateConfig) without checking if the resolved path escaped the intended directory scope. This allowed local file inclusion and path traversal attacks (e.g., ../../../../../etc/passwd) because expandingTildeInPath does not resolve parent directory (..) components.
🎯 Impact: Attackers could potentially read sensitive files on the system by supplying manipulated paths.
🔧 Fix: Used (path as NSString).standardizingPath to resolve .. components and implemented a strict prefix check against the canonical ~/.cacheout/ directory.
✅ Verification: Ensure that attempting to validate a config outside ~/.cacheout/ is rejected. Tests were run, but this environment lacks the macOS tooling. Visual verification of logic is complete.

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PR created automatically by Jules for task 6296325120435992903 started by @acebytes

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