Termoso v0.5.2

Signed desktop builds of Termoso 0.5.2.

Every installer ships with a minisign .sig; the app verifies it against the
public key compiled into the binary before installing an update. latest.json
is the updater manifest — mirror it (and the assets) on your own server to keep
update checks fully self-hosted; see docs/RELEASING.md.

macOS: _aarch64.dmg is for Apple Silicon, _x64.dmg for Intel. Unless this
repository has a Developer ID configured, the builds are ad-hoc signed and not
notarized: after dragging Termoso to Applications run
xattr -cr /Applications/Termoso.app once (or right-click → Open) — see
docs/RELEASING.md.