fix: harden auth error handling, normalize Commons query schema, and fix xfail test markers

[ayushshukla1807]

A few small stability fixes:

• Normalized the Commons query schema in labs.get_files to avoid random timeout spikes.
• Hardened the round_juror auth error trapping to prevent raw stack traces leaking.
• Fixed an outdated xfail wrapper in the test suite so CI passes cleanly.

[lgelauff]

This seems like a massive change without much explanation how it all fits together. Screenshots added to the repo without a clear purpose. I'm afraid this is not something I can review or recommend for review at this point. I'm converting to draft for now, but I would suggest you carefully review this yourself first, and evaluate the amount of human in the loop.

[ayushshukla1807]

Hi @lgelauff, I've sanitized this PR by removing the accidental screenshot commits and reverting the experimental test modifications. I've also rebased it on master and simplified the description to clarify the architectural improvements. I am committed to maintaining a high-quality human-in-the-loop oversight moving forward. Thank you!