* feat(install): prebuilt-app installs by default, --source opt-in, --version picker
- install.sh: default mode now downloads the verified release asset
(dmg/AppImage + SHA256SUMS check) instead of cloning and building;
--source keeps the previous clone-and-build flow; --version pins a release
- install.ps1: same split — msi download with checksum verification and
setup wizard by default; -Source (or VOICESTUDIO_INSTALL_MODE) for the
source build; VOICESTUDIO_VERSION picks a release
- worker landing page documents the modes
* fix(install): CI smoke covers binary + source modes; hdiutil output parse
- drop -quiet from hdiutil attach (it suppresses the mount-point line the
script parses — caught by the macOS smoke)
- install.ps1 runs msiexec silently under CI, wizard interactively
- smoke verifies binary installs per OS (app bundle / AppImage / MSI
registry entry) and keeps full source coverage behind --source
* ci(install): check HKCU/WOW6432Node too — Tauri MSI registers per-user
* fix(install): rename $version — collides with bun installer's $Version under iex