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

[raccioly]

🚨 Severity: CRITICAL
💡 Vulnerability: The VS Code extension used execSync(cmd, { cwd: workspaceDir }) to execute specguard commands. It dynamically generated the cmd string using untrusted folder paths (via workspaceDir) and string-interpolated arguments. This creates a critical Remote Code Execution (RCE) vulnerability because an attacker could craft a malicious folder name with shell operators (like ;, &&, or ||) to execute arbitrary commands when the user opens the project in VS Code.
🎯 Impact: Opening a maliciously crafted project in VS Code would result in immediate Remote Code Execution (RCE) without user interaction, leading to complete system compromise.
🔧 Fix: Refactored execSpecguard to use execFileSync instead of execSync. Implemented a parseArgs tokenization function to process arguments properly. Instead of relying on wrapper scripts (.cmd) which require shell: true to execute on Windows (thus re-introducing RCE risks), the fix resolves the actual underlying JavaScript file (node_modules/specguard/cli/docguard.mjs) and calls the node binary directly. The activate command signature was updated to async.
✅ Verification: Ran pnpm test and passed all 61 tests without regressions. Simulated Windows resolution code to ensure Node scripts will properly execute directly via the engine. Ensure syntax is valid via node -c vscode-extension/extension.js.

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PR created automatically by Jules for task 13179415427409074010 started by @raccioly

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