🛡️ Sentinel: [HIGH] Fix potential local code execution via git config

[tachyon-beep]

🚨 Severity: HIGH
💡 Vulnerability: Invoking git via subprocess against potentially untrusted directories could lead to local code execution via malicious .git/config files (specifically through features like core.fsmonitor).
🎯 Impact: An attacker could execute arbitrary commands by placing a malicious .git/config file in a directory that the wardline scanner operates on.
🔧 Fix: Propagated the _SAFE_GIT_CONFIG = ("-c", "core.fsmonitor=false") pattern (already used in attest.py) to all other modules making git subprocess calls (delta.py and legis.py).
✅ Verification: Ran the test suite (make test), formatted and linted the code. Added a journal entry to .jules/sentinel.md documenting this finding.

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PR created automatically by Jules for task 18415563806124433476 started by @tachyon-beep

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