Ariadne v0.8.16

This macOS usability release makes Ariadne discoverable and recoverable like a
normal application while keeping every supported release target green.

Added

A signed Ariadne.app. The macOS installer places the application in
/Applications when writable and falls back to ~/Applications, with a
native Ariadne icon and no administrator requirement.
One-click tray recovery. Finder, Spotlight, and Launchpad can start the
existing tray LaunchAgent. The launcher prefers the canonical service, can
recover a loaded versioned agent, and re-registers the canonical plist when
needed.
No unmanaged duplicate. The app asks launchd to start the tray instead of
launching the tray binary directly, preserving the existing single-instance
and lifecycle guarantees.

macOS-only launcher tests are excluded from Windows test compilation while a
Windows-safe launcher stub remains in the release archive.

Core MCP, Qdrant data, backups, maintenance, and update behavior are
unchanged.
Linux and Windows packages include the small launcher binary for consistent
release contents, but Ariadne.app installation is macOS-only.

launcher label parsing and AppleScript escaping tests
app bundle, executable mode, plist, PNG icon, ICNS conversion, and installer tests
full Go tests, Windows tests, cross-builds, lint, release metadata, and rendered site tests