MSU

Deferred server upgrade partial staging: when stage all or automation install finds a server upgrade that is not safe to stage, MSU no longer aborts all targets. It defers the upgrade and stages current-version server maintenance (when enabled), mod updates for the running Minecraft version, and self-update when safe.

Automation logging: combined auto-stage outcomes are now written to the msu-updater log so operators see why staging did or did not proceed.