🛡️ Sentinel: [CRITICAL] Fix command injection in file opening

[haseeb-heaven]

🚨 Severity: CRITICAL
💡 Vulnerability: Command injection vulnerability in _open_resource_file due to the use of subprocess.call with shell=True and unescaped user input on Windows.
🎯 Impact: An attacker could execute arbitrary commands by supplying a maliciously crafted filename containing shell metacharacters.
🔧 Fix: Replaced subprocess.call(['start', filename], shell=True) with the safe os.startfile(filename) API for Windows.
✅ Verification: Verified via static analysis and automated test suite execution.

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PR created automatically by Jules for task 13108888884783980079 started by @haseeb-heaven

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 6143a7a2-3b1b-44ff-832a-bdef10c3f475

📥 Commits

Reviewing files that changed from the base of the PR and between 2a47494 and 72c55f3.

📒 Files selected for processing (2)

• .jules/sentinel.md
• libs/utility_manager.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch sentinel-fix-command-injection-windows-13108888884783980079

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