🛡️ Sentinel: [Enhancement] Enforce secure path resolution for system binaries

[ManupaKDU]

🚨 Severity: HIGH
💡 Vulnerability: Privilege Escalation via PATH Interception. The application used shutil.which('ping') which searches the default environment PATH. In shared or misconfigured environments, an attacker could place a malicious executable named ping in a user-writable directory that appears early in the PATH, causing the application to execute arbitrary code.
🎯 Impact: Local Arbitrary Command Execution / Privilege Escalation.
🔧 Fix: Enforced secure path resolution by explicitly passing a restricted, trusted path="/bin:/usr/bin:/sbin:/usr/sbin" to shutil.which().
✅ Verification: Ran test_testping1.py unit tests and visually verified network scanner runs locally.

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PR created automatically by Jules for task 14648094286107437454 started by @ManupaKDU

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