🛡️ Sentinel: [MEDIUM] Replace insecure random generators with cryptographic alternatives

[xbmc4lyfe]

🚨 Severity: MEDIUM
💡 Vulnerability: Use of insecure pseudo-random number generator (random module) for backoff delays in subprocess execution loops, violating secure coding standards and failing static analysis (Bandit B311).
🎯 Impact: While random was used for retry logic and not cryptographic key generation, relying on predictable PRNGs introduces unnecessary risk and flags security checks. Replacing them with secrets hardens the codebase and builds a robust security posture against PRNG determinism vulnerabilities.
🔧 Fix: Replaced import random with import secrets and random.uniform() with secrets.SystemRandom().uniform() in ralph_loop/identity.py and ralph_loop/git_ops.py.
✅ Verification: Ran bandit -r ralph_loop/ to confirm B311 warnings were eliminated. Syntactically verified changes and executed test suite to ensure no regressions in retry execution paths.

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PR created automatically by Jules for task 1654284585508823461 started by @xbmc4lyfe

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