feat(js): m10 extensions (pause, restart, speed-up via Frame) with tests

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>

js/solutions/input.js

@@ -8,5 +8,11 @@ const directions = {
   ArrowRight: 'Right', d: 'Right', D: 'Right',
 }
 
+// Keys that are not steering (m10).
+const commands = { ' ': Action.TogglePause, r: Action.Restart, R: Action.Restart }
+
+// hasOwn, not `key in table`: "constructor" and "toString" are inherited properties, not keys we mapped.
 export const keyToAction = (key) =>
-  Object.hasOwn(directions, key) ? Action.Turn(directions[key]) : null
+  Object.hasOwn(directions, key) ? Action.Turn(directions[key])
+    : Object.hasOwn(commands, key) ? commands[key]
+    : null