Tenebra v0.4.4

Desktop builds of Tenebra for Windows and macOS.

Windows is user-ready: run the installer (SmartScreen warns on an
unsigned build -> More info -> Run anyway); it sets up the background
service, and the in-app updater keeps both app and service current.

macOS is for advanced users, not click-to-run yet. The DMG alone
will NOT give you a working tunnel: macOS needs a root helper daemon
that is currently installed by hand with a sudo script
(scripts/macos/install-daemon.sh), and the build is unsigned (first
launch: System Settings -> Privacy & Security -> Open Anyway). Read
the "macOS note" in the README before downloading. A signed,
click-to-run macOS build is planned.

Updates are delivered in-app and verified against the project's
minisign key before they install (on macOS the updater refreshes the
app, not the hand-installed daemon).