Mac Helper 1.2.1

Production Sparkle update with cloud-agent reliability improvements, safer provider selection, and better received-file handling.

What changed

• Published the signed Sparkle feed on updates.maccess.io with legacy-host compatibility.
• Improved Cloud Mackie self-repair and preserved the selected AI provider.
• Reveals received files in Finder safely on the main thread.
• Completed the maccess.io domain and update-host migration.