🛡️ Sentinel: [CRITICAL] Fix git config arbitrary code execution vulnerability

[tachyon-beep]

• 🚨 Severity: CRITICAL
• 💡 Vulnerability: Invoking git via subprocess against potentially untrusted directories can lead to local code execution via malicious .git/config files (e.g. core.fsmonitor).
• 🎯 Impact: Attackers could execute arbitrary code when the scanner analyzes their repository.
• 🔧 Fix: Added -c core.fsmonitor=false (_SAFE_GIT_CONFIG) to all git subprocess calls in src/wardline/core/delta.py and src/wardline/core/legis.py. Updated tests/unit/core/test_delta.py to match the new command line arguments. Added an entry to .jules/sentinel.md documenting this learning.
• ✅ Verification: Verified the fix passes all unit tests and linting (make test, make format, make lint).

---

PR created automatically by Jules for task 5847839527563382106 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.