feat(userspace): programs in /bin w/o .elf; bin manifests (needs = display) so shell runs snake; Ctrl+C kills foreground via terminal interrupt notification; ctrl keys; sleep

crates/servers/terminal-server/src/grid.rs

@@ -80,6 +80,11 @@ impl Grid {
         }
     }
 
+    /// Marks every row to be drawn again.
+    pub fn touch_all(&mut self) {
+        self.dirty.fill(true);
+    }
+
     pub fn clear(&mut self) {
         self.cells.fill(b' ');
         self.col = 0;