🛡️ Sentinel: [CRITICAL] Fix internal error leakage in 500 responses

[davidruzicka]

Added generateCorrelationId() to all 500 Internal Server Error responses in src/auth/oauth-provider.ts and src/transport/http-transport.ts to prevent the leakage of sensitive internal error details. Responses now return a generic message along with a correlation ID, while the full error details are logged securely on the backend. Updated related test assertions to expect the new response format.

---

PR created automatically by Jules for task 7384753000065337055 started by @davidruzicka

[google-labs-jules]

👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down.

I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job!

For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with @jules. You can find this option in the Pull Request section of your global Jules UI settings. You can always switch back!

New to Jules? Learn more at jules.google/docs.

---

For security, I will only act on instructions from the user who triggered this task.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

📢 Thoughts on this report? Let us know!