Windows parity: Relaunch prompt needs a live relaunch after a real upgrade (testing gap) #743

Current reconciliation - 2026-11-09

The historical prerequisite install failure is no longer an unfixed PSModulePath source blocker: PR #763 merged its environment correction. A verified newer Windows beta31 ZIP is available, but its publication explicitly does not claim an installed beta30-to-beta31 in-app upgrade.

Still open / Partial: complete an actual in-app upgrade, then witness Relaunch Now/Later and continuity of loops/sessions across that upgrade restart. #963's ordinary workspace close/reopen selected-pane acceptance is a different lifecycle and cannot close this issue. Original NotExecuted and failed-install history are preserved.

The original report, acceptance criteria and historical evidence below are preserved; the dated scope/progress above supersedes obsolete missing-feature claims.

Is your feature request related to a problem?
Parity row Relaunch prompt (Updates and dialogs) in investigation/ui-parity-matrix.md is Partial.

macOS: Relaunch Now/Later and a session-continuity explanation.

Windows today: The prompt and relaunch logic exist with unit tests.

Gap: No real install has completed, so relaunch and zmx session survival across an upgrade restart are unproven.

Describe the solution you'd like
After the live upgrade above, exercise Relaunch Now and Later and verify loops and sessions survive.

Describe alternatives you've considered
N/A

Additional context
This is a testing gap: Windows implements it; only live/runtime evidence is missing. Unblocked by the beta26 publication. Parity status and the beta25 Dev Box review are recorded in #719.