refactor: integrate key management into cursor module

- Move useKeyBindings functionality into useCursor as useGameKeys
- Flatten GameManager interface using intersection types
- Rename clearLog/getLog to clearKeyLog/getKeyLog for clarity
- Remove separate useKeyBindings module and exports
- Update all documentation to reflect new architecture
- Maintain backward compatibility for platform hooks

example/src/useKeyBindings.ts

@@ -2,15 +2,14 @@ import { useEffect } from "react";
 import type { GameManager } from "../../src";
 
 export const useKeyBindings = (gameManager: GameManager) => {
-  const { gameStatus, renderBoard, startGame, quitGame, keyManager } = gameManager;
-  const { clearLog } = keyManager;
+  const { gameStatus, renderBoard, startGame, quitGame, clearKeyLog } = gameManager;
 
   useEffect(() => {
     const handler = (ev: KeyboardEvent) => {
       // start game
       if (ev.code === "Space") {
         if (["waiting", "game-over", "game-won"].includes(gameStatus)) {
-          clearLog();
+          clearKeyLog();
           renderBoard();
           if (gameStatus === "game-over" || gameStatus === "game-won") {
             quitGame();