Use a prepare and commit handoff for remote desktop updates. Retry lost commits, require the prepared version after reconnect, and recover backends and windows when installation fails.

Built with GPT-5.6 Sol in Codex.

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
Co-authored-by: Adolanium <94890352+Adolanium@users.noreply.github.com>