🛡️ Sentinel: [MEDIUM] Fix credential leakage by expanding sensitive key patterns

[hongymagic]

🚨 Severity: MEDIUM
💡 Vulnerability: The SENSITIVE_KEY_PATTERNS array used for redacting sensitive fields did not include patterns for common authentication methods like bearer, session, jwt, and cookie.
🎯 Impact: Any of these authentication tokens passed within headers or configuration could be logged in plaintext in error logs and debug outputs.
🔧 Fix: Expanded SENSITIVE_KEY_PATTERNS in src/sensitive.ts to include bearer, session, jwt, and cookie.
✅ Verification: Tests passing, verified that these new values are appropriately redacted in nested debug log objects.

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PR created automatically by Jules for task 3042015892960629335 started by @hongymagic

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