🛡️ Sentinel: [CRITICAL] Fix command injection in VS Code extension via execSync

[raccioly]

🚨 Severity: CRITICAL
💡 Vulnerability: Command injection vulnerability via execSync within the execSpecguard function in the VS Code extension. The extension was concatenating strings and passing them directly to a shell, making it susceptible to injection if an attacker were to manipulate the arguments or parameters such as workspaceDir.
🎯 Impact: This could allow arbitrary code execution with the permissions of the user running VS Code, potentially leading to unauthorized access, data loss, or system compromise.
🔧 Fix: Upgraded the execution mechanism to use execFileSync and modified execSpecguard and its callers to accept and pass an array of arguments, bypassing the system shell and neutralizing injection vectors. Also updated runCommand to parse the command string into an array.
✅ Verification: Tested the VS Code extension codebase to ensure there are no syntax errors using node -c vscode-extension/extension.js. Verified the complete test suite passed with pnpm test successfully.

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PR created automatically by Jules for task 11711034457162448192 started by @raccioly

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