## Summary
Add a new boolean input `download-from-astral-mirror` (default: `true`)
that controls whether uv is downloaded from the Astral mirror or
directly from GitHub Releases.
When set to `false`, the mirror rewrite is skipped entirely and the
download goes straight to GitHub Releases.
Closes: #870
## Summary
- add top-level uncaughtException and unhandledRejection handlers for
the save-cache entrypoint
- report unexpected post-action failures through core.setFailed with
stack/context
- regenerate the committed save-cache bundle
