Cairn as an app

What's new

• Cairn.app. The editor installs on macOS as an app in Applications, with the runtime, the command line tool, the templates and the samples inside. It needs nothing else to make, play and export games.
• Cairn-CLI --help lists every command with what it takes, and --help name only those that start with it, with no editor running.
• A new web loading screen. A web game starts on its own once it has downloaded, with no Play button. While it loads, the page shows the Cairn name, the game's name, one progress bar for the engine and the game, and links to safi-studio.com and the docs. Sound comes on at the player's first click, touch or key press.
• Every page of the documentation is also published as plain Markdown, listed in llms.txt.
• The hub's Learn page and the Help menu open the documentation site.

Known issues

• Cairn.app is signed ad hoc and not notarized, so macOS asks before opening it the first time.