🛡️ Sentinel: [HIGH] Fix command injection in VS Code extension

[raccioly]

🚨 Severity: HIGH
💡 Vulnerability: Command injection vulnerability in vscode-extension/extension.js via the execSync function. The args variable, constructed from inputs within the extension context, was passed directly to a shell environment. If args or paths contained shell metacharacters, it could lead to arbitrary command execution on the host machine.
🎯 Impact: A malicious actor could exploit this vulnerability to execute arbitrary shell commands on a developer's machine using the VS Code extension.
🔧 Fix: Replaced execSync with execFileSync and an explicit array of arguments. This bypasses shell execution and ensures arguments are treated safely as program inputs. Included cross-platform fallback logic to properly append .cmd for tools like npx on Windows. Refactored the activate function to handle async constraints since refreshScore() includes await.
✅ Verification: Ran node -c to verify no syntax errors were introduced. Verified that the overall test suite using pnpm test successfully completed without new regressions.

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PR created automatically by Jules for task 16202726504476685480 started by @raccioly

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