🛡️ Sentinel: [CRITICAL] Fix command injection via git config

[tachyon-beep]

🚨 Severity: CRITICAL
💡 Vulnerability: Potential command injection via malicious .git/config configurations when executing git commands on untrusted repositories via subprocess.run.
🎯 Impact: A malicious repository could achieve local code execution by configuring a malicious core.fsmonitor script that runs automatically on certain git commands.
🔧 Fix: Add _SAFE_GIT_CONFIG = ("-c", "core.fsmonitor=false") to all git invocations within src/wardline/core/delta.py and src/wardline/core/legis.py.
✅ Verification: Ensure the test suite passes, particularly tests verifying the mocked arguments to subprocess.run.

---

PR created automatically by Jules for task 18445620665194592914 started by @tachyon-beep

[google-labs-jules]

👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down.

I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job!

For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with @jules. You can find this option in the Pull Request section of your global Jules UI settings. You can always switch back!

New to Jules? Learn more at jules.google/docs.

---

For security, I will only act on instructions from the user who triggered this task.