🛡️ Sentinel: [CRITICAL] Fix local code execution via malicious git config

[tachyon-beep]

🚨 Severity: CRITICAL
💡 Vulnerability: Running git commands (like rev-parse, diff, ls-files) via subprocess.run inside an untrusted directory can lead to arbitrary code execution if the directory contains a malicious .git/config configuring core.fsmonitor to run a malicious executable.
🎯 Impact: A malicious actor could execute arbitrary code when the scanner examines an untrusted repository.
🔧 Fix: Explicitly passed ("-c", "core.fsmonitor=false") as _SAFE_GIT_CONFIG to all git invocations via subprocess.run in src/wardline/core/delta.py and src/wardline/core/legis.py.
✅ Verification: Ran make test, make lint, make format, and make typecheck successfully, and ensured that no subprocess.run(["git", ...]) are missing the _SAFE_GIT_CONFIG.

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PR created automatically by Jules for task 14872374062354284865 started by @tachyon-beep

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