bmersereau shores up how Mike stores your files

A quiet reliability pass on the backend layer that holds every uploaded document.

Every legal-AI product lives or dies on the file store behind it - the place uploaded documents and generated exports actually sit. bmersereau's fork reworks that layer in Mike, which uses Cloudflare's R2 object storage (a cloud service for holding files). The changes are unglamorous but the kind of thing that keeps a production system honest:

Faster, steadier connections: the storage client is now reused across requests instead of being rebuilt every time, cutting overhead and keeping connections warm.
Failures that actually show up: when a download or a file link fails, it now gets logged instead of silently returning nothing - so an outage can be traced rather than guessed at.

The rest is housekeeping: a stray test that was breaking the build is gone, and basic test coverage for the storage layer is in.