stable-release.yml runs `jobs: win32-bundle` as its own call after the
per-arch candidate calls. In that call validate selects only win32-bundle, so
assemble-win32-bundle's gate (win32-x64/win32-arm64 selected AND their build
jobs succeeded) was always false and the job skipped, which failed the stable
bundle phase with `assemble-win32-bundle=skipped`.
A build selected in the same call must still succeed; an unselected one is
fetched from the R2 handoff, as the assemble steps already do.
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