Add the release lane: a GitHub Actions workflow and a local release script

GitCafe hosts no release downloads and runs no CI, so installers ship from
the GitHub mirror. Tagging v* now tests, packages and attaches the installer
to a GitHub release, and scripts/release.mjs cuts the same build locally.

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>
a757af7464Screen committed on 10/10/2026, 2:00:20 AMparentdc359d8
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