🛡️ Sentinel: [HIGH] Fix sensitive credential leakage in logs

[hongymagic]

🚨 Severity: HIGH
💡 Vulnerability: Common web authentication tokens (bearer, session, jwt, cookie) were missing from the sensitive keys list, leading to their plaintext exposure in debug and failure logs if present in configuration headers or payloads.
🎯 Impact: Attackers or unauthorized users could potentially extract valid authentication tokens from log files, leading to unauthorized access.
🔧 Fix: Expanded SENSITIVE_KEY_PATTERNS in src/sensitive.ts to include these common token names.
✅ Verification: Ran bun run test to verify changes, ensuring no regressions. Tests covering security string manipulation pass correctly.

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PR created automatically by Jules for task 11478949738618409907 started by @hongymagic

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