feat(display): windows: full-screen, F1 cycles, OS bar (names, front, user); canvas-only (display-owned buffers, 4 max, reused); launchers OPEN (pm per app, terminal own), window caps minted by display; FORGET on launcher death via init courier; raster crate (font, chunked text); F-keys in input; terminal+snake on canvas; REDRAW gone

crates/ports/input-device/src/lib.rs

@@ -13,6 +13,8 @@ pub enum Key {
     Backspace,
     Tab,
     Char(u8),
+    /// F1 is 1.
+    Function(u8),
 }
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]