🛡️ Sentinel: [HIGH] Fix Path Truncation Vulnerability in Model Path Validation

[EffortlessSteven]

• 🚨 Severity: HIGH
• 💡 Vulnerability: Missing null byte (\0) rejection in model path validation allows potential Path Truncation vulnerabilities in underlying OS-level operations.
• 🎯 Impact: An attacker might bypass extension checks by appending a null byte followed by an allowed extension to a malicious path (e.g. /etc/passwd\0.gguf).
• 🔧 Fix: Explicitly check for and reject paths containing null bytes.
• ✅ Verification: Added explicit test cases verifying null bytes are blocked in paths.

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PR created automatically by Jules for task 14083749361651997731 started by @EffortlessSteven

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