🛡️ Sentinel: [CRITICAL] Fix process-list credential exposure in mysqldump

[docxology]

🚨 Severity: CRITICAL
💡 Vulnerability: mysqldump password was being passed as a command-line argument (-p...).
🎯 Impact: Command-line arguments of active processes can be read by other users on the system via the process list (ps or /proc), potentially leaking the database credentials.
🔧 Fix: Switched from using the -p flag to using the MYSQL_PWD environment variable passed explicitly into subprocess.run(). This securely injects the credentials without exposing them to the global system environment or process list.
✅ Verification: Ran pytest against src/codomyrmex/tests/unit/database_management/. Code manually inspected to confirm -p flag removal and MYSQL_PWD logic addition in src/codomyrmex/database_management/backup/backup_manager.py. Added learning to .jules/sentinel.md.

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PR created automatically by Jules for task 7373172988384209380 started by @docxology

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