arius update fails on windows

[woutervanranst]

[woutervanranst]

Reviewed against the current codebase.

Assessment: unclear from code inspection alone.

Current evidence:

• There is still Windows-specific update logic in src/Arius.Cli/Commands/Update/UpdateVerb.cs plus the embedded WindowsUpdateAfterExit.ps1 script.
• I did not find clear Windows-specific test coverage for the update path in the repo.
• The issue body/comments do not currently contain a concrete reproduction, stack trace, or failure mode.

I would keep this open only if the failure is still reproducible. Otherwise it probably needs either a reproduction comment or closure as stale/unconfirmed.