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Initial release: Caps Lock rerouted to a spare function key (F19 by default, F13–F20 selectable) inside macOS's HID system — instant input-source switching with none of Caps Lock's built-in delay, and no process ever touching a keystroke.
The mapping is re-asserted automatically after sleep and whenever a keyboard (re)connects, so Bluetooth keyboards can't shake it off.
First-run onboarding walks through the one manual step: binding "Select next source in Input menu" to the rerouted key in System Settings.
Menu bar toggle, Settings with launch at login and destination-key choice, and Sparkle auto-updates.