🛡️ Sentinel: [CRITICAL] Fix command injection vulnerability

[raccioly]

🚨 Severity: CRITICAL
💡 Vulnerability: Command Injection. The ensureSpecKit function in cli/ensure-skills.mjs was using execSync to run specify init. The command constructed included user-controlled data via the detectedAgent variable (loaded from .specify/init-options.json or other agent config files). A malicious repository could supply a payload (e.g., ; rm -rf /) that would execute arbitrary shell commands when the user runs any docguard command.
🎯 Impact: Remote Code Execution (RCE). An attacker could compromise a developer's machine simply by having them run docguard in a project with a malicious configuration file.
🔧 Fix: Replaced the vulnerable execSync call with execFileSync. The command arguments are now constructed and passed securely as an array, preventing any shell interpolation. A safe fallback using a try-catch for specify.cmd was added to ensure Windows compatibility.
✅ Verification:

• Validated via a custom Proof-of-Concept payload script that confirmed the exploit is now neutralized.
• Ran the full pnpm test suite to ensure no functional regressions (61 passing tests, 0 failures).

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PR created automatically by Jules for task 3960551479070147211 started by @raccioly

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