- e2e + dogfood matrices are now windows-latest only: GitHub's scarce mac
runners left the macos legs perpetually queued/starved and they surfaced
mac-only failures untriageable from the Windows dev box, so the whole
matrix read red
- remove the now-dead macOS build steps; re-add macos-14/macos-13 (matrix
edit + workflow_dispatch) when a Mac maintainer can own them
- gate the expensive build on artifact-affecting paths only (electron,
frontend, backend, e2e, build+ci scripts) plus PRs to main + dispatch;
cheap hermetic gates still run on every push
- verify-release-readiness defaults to --require win32 so the removed darwin
leg does not block every v* tag forever